Re: Getting data from 2 tables if records have same date!
On 2/29/2012 5:54 PM, LUCi5R wrote: JW, I'm trying to understand LEFT JOIN as we go - but it's not working. This query SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Is giving me some results which I'm not quite sure what they are - but it's not the right results. The way I'm testing is, on 02/28/12 I had 57 Customers created in the CUSTOMERS table. I also had a total of 105 Calls recorded in the CALLS table. Some calls were from the same customers more then once. Essentially, I need the result to be 86 which I got from some manual calculations. Out of those 86 records, 1 record is in the CUSTOMERS table but not in the CALLS table. The other 85 were in both tables. The above LEFT JOIN query gave me 69 records and quite a few duplicate entries. I'm trying to dissect it to understand what exactly it selected. Thanks! ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com From: Johnny Withers [mailto:joh...@pixelated.net] Sent: Wednesday, February 29, 2012 1:30 PM To: luc...@luci5r.com Cc: mysql@lists.mysql.com Subject: Re: Getting data from 2 tables if records have same date! Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Try this: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE WHERE CUSTOMERS.DATE = 02/28/12 This will give you a list of all customers for a given date and a list of every call they made on that date. If a customer made no calls on a date, then all of the columns for that table will be NULL. If you only want a list of customers and details about the calls on a date then an INNER JOIN is appropriate. If you want to see the full list of customers and any calls on that date use this: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE = 02/28/12 If you only want a list of customers that made any calls on a given date, you can use the EXISTS comparator like this: SELECT customers.* FROM customers WHERE EXISTS (SELECT * FROM calls WHERE CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE = 02/28/12) http://dev.mysql.com/doc/refman/5.5/en/exists-and-not-exists-subqueries.html It's possible to get you any combination of data you want, we just need you to clarify the relationship you are trying to find and how much data you really want to get back. NOTE: the name of the column date is using a reserved word. You may want to enclose it in backticks to avoid confusion as in `date`. Also, the standard MySQL syntax for date literals uses ISO notation. So instead of using 02/28/12 (using double quotes) I expected to see '2012-02-28' (using single quotes) -- Shawn Green MySQL Principal Technical Support Engineer Oracle USA, Inc. - Hardware and Software, Engineered to Work Together. Office: Blountville, TN -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Getting data from 2 tables if records have same date!
On Thu, Mar 1, 2012 at 8:57 AM, Shawn L Green shawn.l.gr...@oracle.comwrote: On 2/29/2012 5:54 PM, LUCi5R wrote: JW, I'm trying to understand LEFT JOIN as we go - but it's not working. This query SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Is giving me some results which I'm not quite sure what they are - but it's not the right results. The way I'm testing is, on 02/28/12 I had 57 Customers created in the CUSTOMERS table. I also had a total of 105 Calls recorded in the CALLS table. Some calls were from the same customers more then once. Essentially, I need the result to be 86 which I got from some manual calculations. Out of those 86 records, 1 record is in the CUSTOMERS table but not in the CALLS table. The other 85 were in both tables. The above LEFT JOIN query gave me 69 records and quite a few duplicate entries. I'm trying to dissect it to understand what exactly it selected. Thanks! ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com From: Johnny Withers [mailto:joh...@pixelated.net] Sent: Wednesday, February 29, 2012 1:30 PM To: luc...@luci5r.com Cc: mysql@lists.mysql.com Subject: Re: Getting data from 2 tables if records have same date! Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Try this: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE WHERE CUSTOMERS.DATE = 02/28/12 This will give you a list of all customers for a given date and a list of every call they made on that date. If a customer made no calls on a date, then all of the columns for that table will be NULL. If you only want a list of customers and details about the calls on a date then an INNER JOIN is appropriate. If you want to see the full list of customers and any calls on that date use this: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE = 02/28/12 If you only want a list of customers that made any calls on a given date, you can use the EXISTS comparator like this: SELECT customers.* FROM customers WHERE EXISTS (SELECT * FROM calls WHERE CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE = 02/28/12) http://dev.mysql.com/doc/**refman/5.5/en/exists-and-not-** exists-subqueries.htmlhttp://dev.mysql.com/doc/refman/5.5/en/exists-and-not-exists-subqueries.html It's possible to get you any combination of data you want, we just need you to clarify the relationship you are trying to find and how much data you really want to get back. NOTE: the name of the column date is using a reserved word. You may want to enclose it in backticks to avoid confusion as in `date`. Also, the standard MySQL syntax for date literals uses ISO notation. So instead of using 02/28/12 (using double quotes) I expected to see '2012-02-28' (using single quotes) -- Shawn Green MySQL Principal Technical Support Engineer Oracle USA, Inc. - Hardware and Software, Engineered to Work Together. Office: Blountville, TN Another gem from Shawn. ;-)
RE: Getting data from 2 tables if records have same date!
JW, Youre correct .. that is what I was getting with the LEFT JOIN and therefore it wasnt the correct answer. I was able to get the correct answer using UNION ALL, however, like you said, I needed 2 queries in that case. One to get the PHONE numbers from both tables and a 2nd query to get all the CUSTOMERS matching the PHONE numbers from the CUSTOMERS table. Although I still have a few issues with that (since I cant use a VIEW cause VIEWS dont allow subqueries in SELECT statements; and I dont really want to create a new table every time this query is run) but anyhow, this is the UNION ALL query that got the correct 86 records result: SELECT PHONE FROM ( (SELECT PHONE,DATE FROM CUSTOMERS) UNION ALL (SELECT PHONE,DATE FROM CALLS) ) results WHERE DATE = 02/28/12 GROUP BY PHONE; I would still like to explore the possibility of doing this using 1 single query which gives me the results I need rather than first getting the correct PHONE numbers; inserting them in a temporary table; and then pulling records out of CUSTOMERS matching those PHONE numbers. THANKS! ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com From: Johnny Withers [mailto:joh...@pixelated.net] Sent: Wednesday, February 29, 2012 3:15 PM To: luc...@luci5r.com Cc: mysql@lists.mysql.com Subject: Re: Getting data from 2 tables if records have same date! After looking at this again, the query you are using; SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Would return all customers in the customer's table created on 2/28/12 WITH no calls or a call on 2/28. Maybe you should try.. SELECT * FROM CUSTOMERS WHERE CUSTOMERS.DATE = 02/28/12 UNION SELECT * FROM CUSTOMERS INNER JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CALLS.DATE = 02/28/12 Basically, you have to do two queries to get the data you want. The WHERE customers.date=2/28 is only getting those customers created on 2/28 regardless if they had a call or not on 2/28. So if you had a customer created on 2/27 and a call on 2/28, the query we were using is not going to pick that customer up. If you want duplicate customers from the second query in the UNION above, you can use UNION ALL instead of just UNION between the queries. -JW On Wed, Feb 29, 2012 at 4:54 PM, LUCi5R luc...@luci5r.com wrote: JW, Im trying to understand LEFT JOIN as we go but its not working. This query SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Is giving me some results which Im not quite sure what they are but its not the right results. The way Im testing is, on 02/28/12 I had 57 Customers created in the CUSTOMERS table. I also had a total of 105 Calls recorded in the CALLS table. Some calls were from the same customers more then once. Essentially, I need the result to be 86 which I got from some manual calculations. Out of those 86 records, 1 record is in the CUSTOMERS table but not in the CALLS table. The other 85 were in both tables. The above LEFT JOIN query gave me 69 records and quite a few duplicate entries. Im trying to dissect it to understand what exactly it selected. Thanks! ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com From: Johnny Withers [mailto:joh...@pixelated.net] Sent: Wednesday, February 29, 2012 1:30 PM To: luc...@luci5r.com Cc: mysql@lists.mysql.com Subject: Re: Getting data from 2 tables if records have same date! Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) JW On Wed, Feb 29, 2012 at 1:02 PM, LUCi5R luc...@luci5r.com wrote: Guys, I've been working with MySQL for a while (been on off this list over the last 10 years or so); I'm definitely not a n00b and have worked with SQL extensively. Used JOIN and all quite a bit ... but I haven't done subqueries, union or nested joins. I'm completely stumped on this problem; and Google hasn't been helpful at all. I'll try to be as descriptive as possible. I have 2 tables ... CUSTOMERS and CALLS. Think of Customers table as your Directory. It has the customer's contact information some other information. In total about 20 fields in there. The Calls table has only about 7 fields. Each time a customer calls in, the conversation details gets recorded in this Calls table. The PHONE field is the key field that joins the CUSTOMERS CALLS
RE: Getting data from 2 tables if records have same date!
SELECT * FROM CUSTOMERS LEFT JOIN CALLS USING(PHONE) WHERE CUSTOMERS.DATE = 02/28/12 OR CALLS.DATE = 02/28/12 ^^^ This is going into an endless loop; I'm not getting any result at all. I'm not sure why. I haven't used USING before so I need to read up a bit on that to understand what you're doing here. Thanks! ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com -Original Message- From: Halász Sándor [mailto:h...@tbbs.net] Sent: Wednesday, February 29, 2012 2:57 PM To: mysql@lists.mysql.com Subject: Re: Getting data from 2 tables if records have same date! ; 2012/02/29 15:29 -0600, Johnny Withers Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Exactly; but I believe that this is the right thing: SELECT * FROM CUSTOMERS LEFT JOIN CALLS USING(PHONE) WHERE CUSTOMERS.DATE = 02/28/12 OR CALLS.DATE = 02/28/12 If you have a hit --PHONE found in both tables--, you will get a record if either date matches, and I believe that you wanted that. If it is a miss --there is no CALLS-record for the PHONE-- CALLS.DATE will be NULL and not equal and only CUSTOMERS.DATE will match a date. And if this works, surely it is clear where to put BETWEEN. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
RE: Getting data from 2 tables if records have same date!
-Original Message-
From: Shawn L Green [mailto:shawn.l.gr...@oracle.com]
Sent: Thursday, March 01, 2012 6:57 AM
To: luc...@luci5r.com
Cc: 'Johnny Withers'; mysql@lists.mysql.com
Subject: Re: Getting data from 2 tables if records have same date!
Try this:
SELECT *
FROM CUSTOMERS
LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND
CUSTOMERS.DATE=CALLS.DATE WHERE CUSTOMERS.DATE = 02/28/12
This will give you a list of all customers for a given date and a list of
every call they made on that date. If a customer made no calls on a date,
then all of the columns for that table will be NULL.
If you only want a list of customers and details about the calls on a date
then an INNER JOIN is appropriate. If you want to see the full list of
customers and any calls on that date use this:
SELECT *
FROM CUSTOMERS
LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND
CUSTOMERS.DATE=CALLS.DATE = 02/28/12
If you only want a list of customers that made any calls on a given date,
you can use the EXISTS comparator like this:
SELECT customers.*
FROM customers
WHERE EXISTS (SELECT * FROM calls WHERE CUSTOMERS.PHONE = CALLS.PHONE AND
CUSTOMERS.DATE=CALLS.DATE = 02/28/12)
http://dev.mysql.com/doc/refman/5.5/en/exists-and-not-exists-subqueries.html
It's possible to get you any combination of data you want, we just need you
to clarify the relationship you are trying to find and how much data you
really want to get back.
NOTE: the name of the column date is using a reserved word. You may want to
enclose it in backticks to avoid confusion as in `date`. Also, the standard
MySQL syntax for date literals uses ISO notation. So instead of using
02/28/12 (using double quotes) I expected to see '2012-02-28' (using
single quotes)
--
Shawn Green
MySQL Principal Technical Support Engineer Oracle USA, Inc. - Hardware and
Software, Engineered to Work Together.
Office: Blountville, TN
~~
Shawn,
I still need to try your queries but I wanted to quickly get back to you on
a couple of things.
You're correct! The DATE column is a reserved word and in my queries I do
indeed use `backticks`. Interestingly, I never knew that's what they are
called!!! I used to call that symbol `Grave Accent` ... never heard it being
called `backticks`. Good to know :)
Secondly, unfortunately this DATE field came from an original FoxPro
Database (DBF) which was an Char (8) field and got translated into mysql as
such. So unfortunately it's not a DATE field ... it's a Char (8) field. For
simplicity, I've been using Date = 02/28/12 to explain my queries here,
but in reality, in my program, I've actually been using the STR_TO_DATE()
function as such ...
STR_TO_DATE(`DATE`, '%m/%d/%Y') = STR_TO_DATE('02/2/12', '%m/%d/%Y')
Lastly, you're correct again, I don't actually use the Double Quotes around
the dates ... I do use Single Quotes.
In regards to the relationship/data that I'm looking for ... this is what
I'm looking for ...
I need to pull the records from the CUSTOMERS table, where
a) The customer was created on given date (Eg:- '02/28/12')
b) The customer called on given date and the call was recorded in the Calls
table (Eg:- '02/28/12')
Let me give your queries a shot understand them!
THANKS!!
~~
LUCi5R
e: luc...@luci5r.com
w: http://www.luci5r.com
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe:http://lists.mysql.com/mysql
Re: Getting data from 2 tables if records have same date!
Stupid wrapping helped me to make a simple mistake. I wrote On 3/1/2012 10:40 AM, LUCi5R wrote: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE = 02/28/12 But I meant it to be SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 But based on your description: a) The customer was created on given date (Eg:- '02/28/12') b) The customer called on given date and the call was recorded in the Calls table There are possibly two different dates at play, a creation date (customers.date) and an activity date (calls.date). Therefore, we need to list them separately. Also, you said you wanted just the CUSTOMERS records (without any call details) so I assume you only want to see a single copy of each customer. This would work best using the EXISTS pattern I provided last with a simple modification: SELECT customers.* FROM customers WHERE EXISTS (SELECT * FROM calls WHERE CUSTOMERS.PHONE = CALLS.PHONE AND CUSTOMERS.DATE=CALLS.DATE = activity date) AND customers.date=creation date There are many other ways to find this same set of data. Here is a two-step process using an indexed temporary table (technically, it's a 3-step process as you need to drop the explicit temp table, too). CREATE TEMPORARY TABLE tmp_custs(key(phone) USINB BTREE) ENGINE=MEMORY SELECT DISTINCT phone FROM CALLS WHERE date=activity date; SELECT customers.* FROM customers INNER JOIN tmp_custs ON tmp_custs.phone = customers.phone WHERE customers.date = create date; DROP TEMPORARY TABLE tmp_custs; By default the MEMORY engine creates all indexes as HASH indexes. So in order to replace the =activity date comparison with any sort of ranged comparison, you need a BTREE index. Regards, -- Shawn Green MySQL Principal Technical Support Engineer Oracle USA, Inc. - Hardware and Software, Engineered to Work Together. Office: Blountville, TN -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Getting data from 2 tables if records have same date!
Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) JW On Wed, Feb 29, 2012 at 1:02 PM, LUCi5R luc...@luci5r.com wrote: Guys, I've been working with MySQL for a while (been on off this list over the last 10 years or so); I'm definitely not a n00b and have worked with SQL extensively. Used JOIN and all quite a bit ... but I haven't done subqueries, union or nested joins. I'm completely stumped on this problem; and Google hasn't been helpful at all. I'll try to be as descriptive as possible. I have 2 tables ... CUSTOMERS and CALLS. Think of Customers table as your Directory. It has the customer's contact information some other information. In total about 20 fields in there. The Calls table has only about 7 fields. Each time a customer calls in, the conversation details gets recorded in this Calls table. The PHONE field is the key field that joins the CUSTOMERS CALLS tables. That is the only identifying key that gets written on the Calls record when that customer calls. One thing to note -- It is possible for a customer to exist in the CUSTOMERS table, but not exist in the CALLS table; however, it is not possible for a PHONE # to be in the CALLS table but not in CUSTOMERS table. Essentially, a customer's record has to be created first in the CUSTOMERS table before a call can be recorded from him in the CALLS table. Also, CALLS table can have multiple entries with same PHONE # (Customer called many times - maybe even same day), but CUSTOMERS will only have a single entry for a PHONE #. Here comes my problem ... I have a PHONE SEARCH box with the ability to define a date range; for simplicity sake - we'll use just One Date instead of DATE ... BETWEEN for now. When someone searches for a PHONE number, I want to show ALL the CUSTOMERS that: a. Were CREATED on that day (Date defined in Search Criteria) b. Had CALLED in that day (Date defined in Search Criteria) The DATA that I need to pull up and show is in the CUSTOMERS table; not the CALLS table -- so the DATA I need needs to come out of the CUSTOMERS table matching on phone from both tables for the given DATE. In other words - any CUSTOMER that has the PHONE NUMBER which appears in BOTH CUSTOMERS CALLS table with the DATE defined should pull up. For the life of me - I can't get this to work!! Let's take the date 02/28/12 for example sake. My biggest issue is ... using JOIN, I can pull up ... a. ALL the phone/customers that appeared in the CALLS table with date 02/28/12 b. ALL the phone/customers that appeared in CALLS CUSTOMERS with date 02/28/12 BUT -- If there's a customer with date 02/28/12 who DOES NOT appear in CALLS table at all - does NOT show up!! And that is because I'm using CUSTOMERS.PHONE=CALLS.PHONE in the JOIN ON clause. So it obviously won't pick up a record where the phone didn't exist in both tables. My initial query was: SELECT * FROM CUSTOMERS JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND CALLS.DATE = 02/28/12 I've tried 100's of combinations of this query; many different OR, AND, GROUP BY combinations --- but I can't pull up ALL records from CUSTOMERS with DATE 02/28/12 and ALL records from CALLS with DATE 02/28/12 in a single query. I've hit a wall here. Any ideas/suggestions/advice? THANKS ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- - Johnny Withers 601.209.4985 joh...@pixelated.net
RE: Getting data from 2 tables if records have same date!
JW, I'm trying to understand LEFT JOIN as we go - but it's not working. This query SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Is giving me some results which I'm not quite sure what they are - but it's not the right results. The way I'm testing is, on 02/28/12 I had 57 Customers created in the CUSTOMERS table. I also had a total of 105 Calls recorded in the CALLS table. Some calls were from the same customers more then once. Essentially, I need the result to be 86 which I got from some manual calculations. Out of those 86 records, 1 record is in the CUSTOMERS table but not in the CALLS table. The other 85 were in both tables. The above LEFT JOIN query gave me 69 records and quite a few duplicate entries. I'm trying to dissect it to understand what exactly it selected. Thanks! ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com From: Johnny Withers [mailto:joh...@pixelated.net] Sent: Wednesday, February 29, 2012 1:30 PM To: luc...@luci5r.com Cc: mysql@lists.mysql.com Subject: Re: Getting data from 2 tables if records have same date! Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) JW On Wed, Feb 29, 2012 at 1:02 PM, LUCi5R luc...@luci5r.com wrote: Guys, I've been working with MySQL for a while (been on off this list over the last 10 years or so); I'm definitely not a n00b and have worked with SQL extensively. Used JOIN and all quite a bit ... but I haven't done subqueries, union or nested joins. I'm completely stumped on this problem; and Google hasn't been helpful at all. I'll try to be as descriptive as possible. I have 2 tables ... CUSTOMERS and CALLS. Think of Customers table as your Directory. It has the customer's contact information some other information. In total about 20 fields in there. The Calls table has only about 7 fields. Each time a customer calls in, the conversation details gets recorded in this Calls table. The PHONE field is the key field that joins the CUSTOMERS CALLS tables. That is the only identifying key that gets written on the Calls record when that customer calls. One thing to note -- It is possible for a customer to exist in the CUSTOMERS table, but not exist in the CALLS table; however, it is not possible for a PHONE # to be in the CALLS table but not in CUSTOMERS table. Essentially, a customer's record has to be created first in the CUSTOMERS table before a call can be recorded from him in the CALLS table. Also, CALLS table can have multiple entries with same PHONE # (Customer called many times - maybe even same day), but CUSTOMERS will only have a single entry for a PHONE #. Here comes my problem ... I have a PHONE SEARCH box with the ability to define a date range; for simplicity sake - we'll use just One Date instead of DATE ... BETWEEN for now. When someone searches for a PHONE number, I want to show ALL the CUSTOMERS that: a. Were CREATED on that day (Date defined in Search Criteria) b. Had CALLED in that day (Date defined in Search Criteria) The DATA that I need to pull up and show is in the CUSTOMERS table; not the CALLS table -- so the DATA I need needs to come out of the CUSTOMERS table matching on phone from both tables for the given DATE. In other words - any CUSTOMER that has the PHONE NUMBER which appears in BOTH CUSTOMERS CALLS table with the DATE defined should pull up. For the life of me - I can't get this to work!! Let's take the date 02/28/12 for example sake. My biggest issue is ... using JOIN, I can pull up ... a. ALL the phone/customers that appeared in the CALLS table with date 02/28/12 b. ALL the phone/customers that appeared in CALLS CUSTOMERS with date 02/28/12 BUT -- If there's a customer with date 02/28/12 who DOES NOT appear in CALLS table at all - does NOT show up!! And that is because I'm using CUSTOMERS.PHONE=CALLS.PHONE in the JOIN ON clause. So it obviously won't pick up a record where the phone didn't exist in both tables. My initial query was: SELECT * FROM CUSTOMERS JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND CALLS.DATE = 02/28/12 I've tried 100's of combinations of this query; many different OR, AND, GROUP BY combinations --- but I can't pull up ALL records from CUSTOMERS with DATE 02/28/12 and ALL records from CALLS with DATE 02/28/12 in a single query. I've hit a wall here. Any ideas
Re: Getting data from 2 tables if records have same date!
what about select customers.* from customers left join calls on (customers.date=calls.date) where customers.date=02/28/12; of course date should be an index in both tables. I think it migth work On Wed, Feb 29, 2012 at 4:54 PM, LUCi5R luc...@luci5r.com wrote: JW, I'm trying to understand LEFT JOIN as we go - but it's not working. This query SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Is giving me some results which I'm not quite sure what they are - but it's not the right results. The way I'm testing is, on 02/28/12 I had 57 Customers created in the CUSTOMERS table. I also had a total of 105 Calls recorded in the CALLS table. Some calls were from the same customers more then once. Essentially, I need the result to be 86 which I got from some manual calculations. Out of those 86 records, 1 record is in the CUSTOMERS table but not in the CALLS table. The other 85 were in both tables. The above LEFT JOIN query gave me 69 records and quite a few duplicate entries. I'm trying to dissect it to understand what exactly it selected. Thanks! ~~ LUCi5R e: luc...@luci5r.com w: http://www.luci5r.com From: Johnny Withers [mailto:joh...@pixelated.net] Sent: Wednesday, February 29, 2012 1:30 PM To: luc...@luci5r.com Cc: mysql@lists.mysql.com Subject: Re: Getting data from 2 tables if records have same date! Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) JW On Wed, Feb 29, 2012 at 1:02 PM, LUCi5R luc...@luci5r.com wrote: Guys, I've been working with MySQL for a while (been on off this list over the last 10 years or so); I'm definitely not a n00b and have worked with SQL extensively. Used JOIN and all quite a bit ... but I haven't done subqueries, union or nested joins. I'm completely stumped on this problem; and Google hasn't been helpful at all. I'll try to be as descriptive as possible. I have 2 tables ... CUSTOMERS and CALLS. Think of Customers table as your Directory. It has the customer's contact information some other information. In total about 20 fields in there. The Calls table has only about 7 fields. Each time a customer calls in, the conversation details gets recorded in this Calls table. The PHONE field is the key field that joins the CUSTOMERS CALLS tables. That is the only identifying key that gets written on the Calls record when that customer calls. One thing to note -- It is possible for a customer to exist in the CUSTOMERS table, but not exist in the CALLS table; however, it is not possible for a PHONE # to be in the CALLS table but not in CUSTOMERS table. Essentially, a customer's record has to be created first in the CUSTOMERS table before a call can be recorded from him in the CALLS table. Also, CALLS table can have multiple entries with same PHONE # (Customer called many times - maybe even same day), but CUSTOMERS will only have a single entry for a PHONE #. Here comes my problem ... I have a PHONE SEARCH box with the ability to define a date range; for simplicity sake - we'll use just One Date instead of DATE ... BETWEEN for now. When someone searches for a PHONE number, I want to show ALL the CUSTOMERS that: a. Were CREATED on that day (Date defined in Search Criteria) b. Had CALLED in that day (Date defined in Search Criteria) The DATA that I need to pull up and show is in the CUSTOMERS table; not the CALLS table -- so the DATA I need needs to come out of the CUSTOMERS table matching on phone from both tables for the given DATE. In other words - any CUSTOMER that has the PHONE NUMBER which appears in BOTH CUSTOMERS CALLS table with the DATE defined should pull up. For the life of me - I can't get this to work!! Let's take the date 02/28/12 for example sake. My biggest issue is ... using JOIN, I can pull up ... a. ALL the phone/customers that appeared in the CALLS table with date 02/28/12 b. ALL the phone/customers that appeared in CALLS CUSTOMERS with date 02/28/12 BUT -- If there's a customer with date 02/28/12 who DOES NOT appear in CALLS table at all - does NOT show up!! And that is because I'm using CUSTOMERS.PHONE=CALLS.PHONE in the JOIN ON clause. So it obviously won't pick up a record where the phone didn't exist in both tables. My initial query was: SELECT * FROM CUSTOMERS JOIN CALLS ON CUSTOMERS.PHONE
Re: Getting data from 2 tables if records have same date!
; 2012/02/29 15:29 -0600, Johnny Withers Sounds like you need to LEFT JOIN: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE = 02/28/12 WHERE CUSTOMERS.DATE = 02/28/12 But that would only get customers created on 2/28 AND having a call on 2/28 OR not call at all on 2/28. This would give you customers created on 2/28 with no calls AND customers created on 2/28 with a call on 2/28: SELECT * FROM CUSTOMERS LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE WHERE CUSTOMERS.DATE = 02/28/12 AND (CALLS.PHONE IS NULL OR CALLS.DATE = 02/28/12) Exactly; but I believe that this is the right thing: SELECT * FROM CUSTOMERS LEFT JOIN CALLS USING(PHONE) WHERE CUSTOMERS.DATE = 02/28/12 OR CALLS.DATE = 02/28/12 If you have a hit --PHONE found in both tables--, you will get a record if either date matches, and I believe that you wanted that. If it is a miss --there is no CALLS-record for the PHONE-- CALLS.DATE will be NULL and not equal and only CUSTOMERS.DATE will match a date. And if this works, surely it is clear where to put BETWEEN. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
