Probability Selects
I've tried Googling till my brain is fried and I'm obviously missing something because I'm not finding anything useful. I'm trying to select names at random from a table that contains the name and the frequency at which it is actually used in society. The table is defined as follows: CREATE TABLE `MaleNames` ( `Name_ID` int(11) NOT NULL auto_increment, `Name` char(50) default NULL, `Frequency` decimal(5,3) default NULL, PRIMARY KEY (`Name_ID`) ) Some examples: 1, Aaron, 0.240 3, Abe, 0.006 13, Adrian, 0.069 What's the best way to select names at random from this but still take into account frequency of use? Thanks in advance! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Bug? Distinct AS with Order By
I'm not sure what to search on to see if someone has reported this as a bug or if I'm doing something wrong... Generic code to draw a SELECT element on the screen sometimes it ends up like such... SELECT DISTINCT name AS myvalue,name AS mydisp FROM names WHERE name!= ORDER BY myvalue On 4.1.22 this returns A A B B C C D D On 5.0.22 this returns D D D D D D D D The odd thing is that if I remove the order by clause it works fine... It also works fine if I remove the second copy of the column BUT this is generic code so it might also be doing something like productid as myvalue,productname as mydisp where the values are different. Ultimately I can sort the array I end up with but it seems like this should work. Especially since it did in 4.x. Am I crazy? Doing something wrong? Thanks! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
VFP to MySQL Query Optimization
I feel like there should be a better way to do this... So I'm hoping someone will be able to advise. We have contacts that belong to organizations. We also have a document tracker. Holding over from VFP you can have up to six organization ids on the document and up to six contact ids. Right now the select to see if a contact has documents looks like this... SELECT * FROM Contacts WHERE (id IN (SELECT contid1 FROM documents) OR id IN (SELECT contid2 FROM documents) OR id IN (SELECT contid3 FROM documents) OR id IN (SELECT contid4 FROM documents) OR id IN (SELECT contid5 FROM documents) OR id IN (SELECT contid6 FROM documents) OR orgid IN (SELECT orgid1 FROM documents) OR orgid IN (SELECT orgid2 FROM documents) OR orgid IN (SELECT orgid3 FROM documents) OR orgid IN (SELECT orgid4 FROM documents) OR orgid IN (SELECT orgid5 FROM documents) OR orgid IN (SELECT orgid6 FROM documents)) Which is UGLY... and I feel like there should be a better way (I know I could break that out into a many-many relationship via a third linking table but I'm not 'able' to do that now.) The only change I can think of is to union the two halves of the select but I'm not sure if that would be better... (IE id in (select contid1 from documents union select contid2 from documents) etc) Any advice or is this the best I'm going to get until I can reorganize the underlying structure? Thanks! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
ALTER TABLE order / optimization
Given table: CREATE TABLE testtab (d_col CHAR(4)); Question 1: It appears that there is no harm in just appending directives onto the alter table command even if the order doesn't make sense. It appears the parser figures it out... For example... ALTER TABLE testtab ADD COLUMN c_col char(4) FIRST, ADD COLUMN b_col char(4) FIRST, ADD COLUMN a_col char(4) FIRST; ...does end up with a_col then b_col then c_col then d_col... but does it matter and I doing something wrong? Question 2: Is that any more efficient than doing... ALTER TABLE testtab ADD COLUMN c_col char(4) FIRST; ALTER TABLE testtab ADD COLUMN b_col char(4) FIRST; ALTER TABLE testtab ADD COLUMN a_col char(4) FIRST; If it's NOT more efficient then I won't bother rewriting this one app which runs slowly to join them up because it certain is easier to read and debug with each modification on its own line. Thanks! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
mysqldump warning or actual error?
My local windows machine has mysql 5.1.33 installed on it. One of my Mac OSX dev servers has some 4.1 flavor of MySQL on it. When I try to do something like the following: mysqldump -h devserver -u me -p somedb dump.sql I get the following: mysqldump: Error: 'Table 'information_schema.files' doesn't exist' when trying to dump tablespaces It looks like it creates the export fine but I've been ssh-ing into the dev box and doing it locally there just in case Should I be worried? Is there some option that would supress that (that i didn't see in mysqldump --help)? Is it truely harmless? Thanks Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Renaming a Database
That said... Is there anything wrong (dangerous, disasterous, etc) with stopping the MySQL service and renaming the folder in the MySQL data folder? By my logic (if I'm right) this should preserve any permissions on the folder and since the service is stopped it should simply find the new instance. If you have InnoDB tables, there will be a problem. InnoDB maintains the database name in the shared tablespace, and it will no longer be able to find those tables. Nope. These are entirely MyISAM tables... So I will probably give this a try then. Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Renaming a Database
No... I've pretty much avoided those. This WAS a Visual FoxPro app so we're still at the stage where we really aren't leveraging MySQL specific features. We're still pretty much just eliminating VFP specific things. Hence the one time nature of this renaming. Now that we're 5-10 customers in to upgrading we decided to actually define a naming convention for the databases themselves so I've got to fix the 5-10 that are already out there (I could not change it... but then we have to remember that these are special cases) On Wed, Aug 19, 2009 at 10:28 AM, Rolando Edwardsredwa...@logicworks.net wrote: If you have stored procedures, don't forget to update the db column with the new db in mysql.proc as that does not automatically change. Rolando A. Edwards MySQL DBA (CMDBA) 155 Avenue of the Americas, Fifth Floor New York, NY 10013 212-625-5307 (Work) 201-660-3221 (Cell) AIM Skype : RolandoLogicWorx redwa...@logicworks.net -Original Message- From: Matt Neimeyer [mailto:m...@neimeyer.org] Sent: Wednesday, August 19, 2009 9:27 AM To: Paul DuBois Cc: mysql@lists.mysql.com Subject: Re: Renaming a Database That said... Is there anything wrong (dangerous, disasterous, etc) with stopping the MySQL service and renaming the folder in the MySQL data folder? By my logic (if I'm right) this should preserve any permissions on the folder and since the service is stopped it should simply find the new instance. If you have InnoDB tables, there will be a problem. InnoDB maintains the database name in the shared tablespace, and it will no longer be able to find those tables. Nope. These are entirely MyISAM tables... So I will probably give this a try then. Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=redwa...@logicworks.net -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Renaming a Database
I know the best way to rename a database is to use mysqldump, extract the database and then reload to the new database. (At least based on what I can find in the 12.1.32. RENAME DATABASE Syntax section of the documentation) That said... Is there anything wrong (dangerous, disasterous, etc) with stopping the MySQL service and renaming the folder in the MySQL data folder? By my logic (if I'm right) this should preserve any permissions on the folder and since the service is stopped it should simply find the new instance. I know in the past I've used a similar method with single tables (stop service, create a folder, drop in backups of tables, start service muck with them) and I've had no problems... but I'm hoping wiser minds will confirm I'll be okay OR that I shouldn't even try. All in all, I'm trying to find a way to minimize OUR development time as well as minimizing down time for the client. This would be a one time thing to bring the database name in line with the new product's newly picked conventions. (After we deployed four customers) If it matters two of the installations are on OSX running a stock MySQL 4.x installation and two are on Windows and I'm not certain the version without checking. Thanks! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Picking Collation Confusion
First off... I've read chapter 9.1.3 on character sets and collations and I'm still confused... :) (that could just be because today is Friday) Our application is installed at several different sites some running on Mac OS, some Windows and a few Linux which I suspect is what led to this situation. To deploy our app we basically do the following... 1. create and test 2. (on test server) mysqldump export.sql 3. (on deployment server) mysql export.sql Now I need to move a set of changes from the test server to the deployment server and I'm using mysqldiff to find the differences. I've noticed that 90% of the changes are simply to align the collation of fields and default collations for tables. Usually it's bouncing between utf8_general_ci and latin1_swedish_ci. 99.99% of the records in our various customers databases will be normal U.S. names and addresses but I know of a few customers that target their base fairly narrowly and might POTENTIALLY need to enter foreign names with accents and the like. Ultimately what it comes down to is... how worried should I be about making collations universal across at least a given customers instances of the application? (If not all copies of the application for all customers) I already have a routine that I call normalize database that makes sure default indexes are applied, etc... so it would be easy to add to that routine to check for and correct collations but then do I need to worry about existing data? Thanks for the advice! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Converting VFP SQL to MySQL
Does anyone have any scripts that will help convert Visual FoxPro 6.0 style WHERE clauses to MySQL... For the most part the problems are converting VFP functions to the equivalent SQL. For example, Visual FoxPro has a function inlist() that is used like inlist(X,1,2,3) which converts to the MySQL query X IN (1,2,3). That's easy enough (relatively speaking) but VFP also has stuff like EMPTY(X) where any of Null, the Empty String (for Char), -00-00 (or the VFP equivalent anyways for dates), False (for Boolean), 0 (for Numeric) are considered empty without needing to know the data type. So that starts getting a lot more complex since I'd need to check the data type of the field in the right table... to be able to convert it to something like (X is null OR X=) or (X is null OR x=0) etc... These are for customer stored queries... I've already manually converted system queries and I'm frustrated to the point of giving up and adding a column untested and let the end user figure it out but that seems bad from the standpoint of lazy and poor customer experience. Thanks! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Removing Duplicate Records
In our database we have an Organizations table and a Contacts table, and a linking table that associates Contacts with Organizations. Occassionally we manually add to the linking table with information gleaned from outside data sources. This is common enough to be annoying, since it ends up with duplicate linkages, but it's FAR from an everyday occurance. I have three options for dealing with the resulting duplicates and I would appreciate some advice on which option might be best. 1. Attack the horrific spaghetti code that determines the Org and Contact ids and then does the manual add. Creating Orgs and Contacts as needed. Calling this code horrific is a kindness... we're talking evil... We've pretty much ruled this out due to the horror... but I mention that I considered it. 2. Do a create table and populate that new table with the results of a select distinct from the old table then swap the tables. 3. Do... SELECT count(*) AS tCount,OrgID,ContID FROM OrgContLink GROUP BY OrgID,ContID HAVING tCount 1. Then for every record in the result DELETE FROM OrgContLink WHERE OrgID=X AND ContID=Y LIMIT 1. Then repeat until no results are found. I like option 2 in so far as it's more... Atomic? One create...select, one swap and its done. But even though it feels more pure I worry that the overhead of completely creating and destroying entire tables seems like throwing the baby out with the bathwater. IOW: Is rebuilding a whole table for a few (hundred at most) offending duplicate records overkill. I like option 3 in that it leaves everything as is but does require a lot of looping and feels inefficient. However, since we'd be running this only after we do our imports it's not like this looping inefficient code would be running all the time. I know I could probably also put a unique key on both orgid and contid but unless I'm reading the docs wrong I can't add a key in such a way that the duplicate key insertion would silently fail without requiring the offending application to do INSERT ... ON DUPLICATE KEY... which gets back to modifying the spaghetti code from option 1. Thanks in advance for your advice. Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Removing Duplicate Records
Ah... Yes. Good point. I like this because I was planning on keeping the output somewhere for a while. (In case we need an accounting at some point) So it will be easy enough to dump what's being deleted to the screen while we loop over our candidates. Thanks! On Tue, Jul 14, 2009 at 10:16 AM, Nathan Sullivannsulli...@cappex.com wrote: If you went with option #3, you could avoid the looping by using (tCount - 1) as the LIMIT in the delete statement instead of always using 1. 3. Do... SELECT count(*) AS tCount,OrgID,ContID FROM OrgContLink GROUP BY OrgID,ContID HAVING tCount 1. Then for every record in the result DELETE FROM OrgContLink WHERE OrgID=X AND ContID=Y LIMIT 1. Then repeat until no results are found. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
CONCAT with IF?
I want to store the product version that an article applies to and a comparison operator in my news system. But I can't wrap my head around the where clause... Here's what I've tried... CREATE TABLE test (version char(10), direction char(2)); select concat(6.0,direction,version) as operation from test; +-+ |operation| +-+ | 6.0=6.0 | 6.0=6.0 | 6.06.1 | 6.06.2 +-+ But when I do select if(concat(6.0,direction,version),Y,N) from test I ALWAYS get Y... which means I wouldn't get any meaningful results if I used it in a where clause... Any ideas on ways I can do this? Thanks! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Half Hour Sub-query in MySQL vs. 5 Seconds in VFP?
On Fri, Jun 19, 2009 at 11:27 AM, Brent Baisleybrentt...@gmail.com wrote: It sounds like you want to use spatial indexes, but they only became available in v4.1 http://dev.mysql.com/doc/refman/5.0/en/create-index.html http://dev.mysql.com/doc/refman/5.0/en/using-a-spatial-index.html That feels like the right thing (spatial calculations = spatial indexes?) but I looked at the docs and my head exploded. Can anyone recommend a good book that takes me through it gently? That said I'm intreged by the MBRContains and the Polygon functions... If I read those right I could create a simplified circle (probably just an octogon) to help eliminate false positives in the corners when using a plain square as the enclosure. You don't have to do any re-architecture to change you subquery to a join: SELECT custzip FROM customers JOIN (SELECT zip FROM zipcodes WHERE degrees(acos(sin(radians(39.0788994))*sin(radians(latitude))+ cos(radians(39.0788994))*cos(radians(latitude))*cos(radians(-77.1227036-longitude*60*1.1515 5) AS zips ON custzip=zip Will that work after a where clause? Multiple Times? For example... (pseudo-code...) SELECT * FROM customers WHERE saleslastyear 10 JOIN (SELECT zip FROM etc) AS zips ON custzip=zip JOIN (SELECT MAX(date) FROM phonecalls) AS LastCalledOn ON custid=custid Just from thinking about that... I assume that the only limitation is that in a subselect you can do something like WHERE NOT IN (select etc) but with a JOIN you are assuming a positive relationship? For example using the JOIN methods above there isn't a way to simply do AND custid NOT IN (SELECT custid FROM ordersplacedthisyear) other than doing exactly that and adding this clause to the saleslastyear clause. (In this particular case a column lastorderdate in customer that was programatically updated on ordering would also be useful but I'm thinking examples here... ;) ) I've never seen JOIN used outside of a traditional SELECT t1.*,t2.* FROM table1 AS t1 LEFT JOIN table2 AS t2 ON t1.id=t2.id type of structure so I kinda feel like I have a new toy... Thanks! -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Half Hour Sub-query in MySQL vs. 5 Seconds in VFP?
SELECT zip FROM zipcodes WHERE
degrees(acos(sin(radians(39.0788994))*sin(radians(latitude))+
cos(radians(39.0788994))*cos(radians(latitude))*cos(radians(-77.1227036-longitude*60*1.1515
5
Ouch. You might want to calculate the rectange enclosing your target
distance, add an index on lat (and/or long), and add the rectangle check to
your where clause: WHERE latitude BETWEEN lt1 AND lt2 AND longitude BETWEEN
ln2 AND ln2. That way mysql can use the index to pare down most of the rows
without having to call all those trig functions for every zipcode.
I like this idea the best (it always bothered me running a query that
involved multiple mathmatical functions).
So... Here's the scratch php code I ended up with... Anyone see any
problems with it? The only problem I see is that I think the old code
was more circular this will be a square (within the limits of a
square on a non-spherical earth... etc.. etc..) ... so there will be
more zip codes included in the corners. If there are too many
complaints about that I might look at some sort of overlapping
rectangle scheme instead of a square.
function ChangeInLatitude($Miles) { return rad2deg($Miles/3960); }
function ChangeInLongitude($Lat, $Miles) { return
rad2deg($Miles/3960*cos(deg2rad($Lat))); }
$Miles = 5;
$OriginalLat = 39.0788994;
$OriginalLon = -77.1227036;
$ChangeInLat = ChangeInLatitude($Miles);
$ChangeInLon = ChangeInLongitude($OriginalLat, $Miles);
$MinLat = $OriginalLat-$ChangeInLat;
$MaxLat = $OriginalLat+$ChangeInLat;
$MinLon = $OriginalLon-$ChangeInLon;
$MaxLon = $OriginalLon+$ChangeInLon;
My only other question is... when I explained the new query... On the
dependent subquery it says possible keys are zip, longitude and
latitude but it used zip. It seems like a better index would be
longitude or latitude? On the primary query, even though there is an
index on custzip it doesn't say it's using ANY indexes. I should
probably leave well enough alone... but I'm curious.
Thanks again!
Matt
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Half Hour Sub-query in MySQL vs. 5 Seconds in VFP?
I'm converting a PHP app from using Visual FoxPro as the database backend to using MySQL as the backend. I'm testing on MySQL 4.1.22 on Mac OSX 10.4. The end application will be deployed cross platform and to both 4.x and 5.x MySQL servers. This query returned 21 records in .27 seconds. SELECT zip FROM zipcodes WHERE degrees(acos(sin(radians(39.0788994))*sin(radians(latitude))+ cos(radians(39.0788994))*cos(radians(latitude))*cos(radians(-77.1227036-longitude*60*1.1515 5 This query returned 21442 records in 1.08 seconds. SELECT custzip FROM customers This query is still running half an hour later, with a Time of 2167 and a State of Sending Data (according to the mysql process list) SELECT custzip FROM customers WHERE custzip IN (SELECT zip FROM zipcodes WHERE degrees(acos(sin(radians(39.0788994))*sin(radians(latitude))+ cos(radians(39.0788994))*cos(radians(latitude))*cos(radians(-77.1227036-longitude*60*1.1515 5) When I try to EXPLAIN the query it gives me the following... id,select_type,table,type,possible_keys,key,key_len,ref,rows,Extra 1,PRIMARY,customers,index,NULL,cw_custzip,30,NULL,21226,Using where; Using index 2,DEPENDENT SUBQUERY,zipcodes,ALL,NULL,NULL,NULL,NULL,42144,Using where If it matters both tables are INNODB and both customers.custzip and zipcodes.zip are indexed. We used a program called DBConvert from DMSoft to convert the data so it's exactly the same on both the VFP side and the MySQL side. With all that in mind... VFP returns the exact same query in 5-10 seconds and that includes render time in the web browser. By comparison... the query WHERE id IN (SELECT id FROM phone WHERE phonedate = '2001-01-01' AND phonedate = '2009-06-18') returns almost instantly. I'm at a complete loss... The suggestions I've seen online for optimizing Dependent Subquery's basically revolve around changing it from a sub-query to a join but that would require more re-architecturing than I want to do... (Unless I'm forced) Especially since more than a few of those solutions suggested precalculating the distance between zipcodes which only works if the distances are known (only allow 10, 50 and 100 mile radi for example) Any ideas? Thanks in advance! Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: MySQL Data Vanishing with FireFox
I think it's your PHP application; how did you debug your application?
All this is doing is letting our customer add their contacts to the database.
This is on the quick add form and asks them to enter a first and last name
and an email.
I debugged by re-writing it temporarily to do this...
$SQL = 'INSERT INTO Contacts (ContFirst,ContLast,ContEmail,UserID) VALUES ('
.$_POST[ContFirst].','.$_POST[ContLast]
.','.$_POST[ContEmail].','.$MyID.')';
echo $SQL;
$result = mysql_query($SQL,$db);
On the theory that the echo shouldn't change the contents of the $SQL
variable.
Then on the same client machine, I open both browsers and launch the page. In
both browsers I can see the exact same statement (including the value
of $MyID)
on the screen but in IE it works and on FireFox it doesn't.
As soon as I see the SQL on the screen I query directly (not through PHP) to
pull out the records and see that UserID is missing.
What data type is column 'C'? Is it ENUM?
Nope. Nothing compilicated... ContFirst,ContLast are Char(30), ContEmail is
Char(100), UserID (the one failing) is INT(4). The typical values of
UserID (at
least when debugging, and still failing) were numbers from 1-20.
Again... since I'm seeing the exact same statement on the screen in the echo,
theory has it that the exact same statement is being passed into the
mysql_query in the next line.
This is why I'm so baffled. Normally I echo the actual statement and it's
obvious what my error is. (Oh... a comma...) OR I echo the statement and see
that FireFox handles cookies different, or passes form values different, or
truncates $_GET at a different length or some other equally obscure thing but
still that the STATEMENT differs and I have something to start tracing from.
Here the statement is identical on both browsers and one fails and the other
doesn't.
Any other ideas?
Matt
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MySQL Data Vanishing with FireFox
We recently started getting reports that when users access our PHP based CRM system that it didn't work. After much debugging and tracking down it looks like that ultimately what's happening is that SOMETIMES with a statement like... INSERT INTO Customers (A,B,C) VALUES (One,Two,Three) ...that Three just doesn't make it into the database. So If I... SELECT * FROM Customers WHERE A=One ... I would get One,Two, It seems to happen more often (maybe only) with FireFox. Other tables have no problems that we can see. C is indexed... but we have other indexed fields in the table that don't seem to be affected. It's not our biggest table by far... I'm baffled. Where do I look next? This is on a hosted box so we have limited access to the command line. This is using PHP 4.3.11 with MySQL 3.23.58 on Apache 2.0.51 on a Fedora system (of unknown version) Thanks in advance... Matt -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Query for Summary Report
Hello All, I've got an SQL question. I have a database that contains Reviews of some of a clients publications. The client is interested in generating some summary reports and I simply can't wrap my head around a single SQL query (if that's possible) that will generate the information I'm looking for. The one they are most interested in is this... We have a table (built on user submissions) that has something like this... DocName DocSubj Usefulness Processors Upgrading 1 Processors Upgrading 2 Hard Drives Upgrading 1 PrintersReviews 3 They want to get something like this... Subject # Reviews Avg Rating Upgrading 3 1.3 Reviews 1 1 And I'm just missing something... I'm sure it has to possible but I can't think of good way to do this. (The only way I can think of is to run one query to grab all the distinct subjects, loop over that resultset and then fetch the count and average for that particular subject on each iteration) Any advice is greatly appreciated. Matt - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
