Thanks. That worked.
Jason Trebilcock wrote:
Methinx you need a "GROUP BY" in there. See below.
-Original Message-
From: John Meyer [mailto:john.l.me...@gmail.com]
Sent: Thursday, September 10, 2009 6:48 PM
To: mysql@lists.mysql.com
Subject: Natural join problem
Methinx you need a "GROUP BY" in there. See below.
> -Original Message-
> From: John Meyer [mailto:john.l.me...@gmail.com]
> Sent: Thursday, September 10, 2009 6:48 PM
> To: mysql@lists.mysql.com
> Subject: Natural join problem
>
> Two tables:
>
Two tables:
USERS:
USER_ID (PK)
. . .etc
TWEETS:
TWEET_ID (PK)
USER_ID (FK)
Trying to get the user information and the number of tweets each person has:
SELECT USERS.USER_NAME, COUNT(TWEETS.TWEET_ID) AS 'TWEETCOUNT' FROM
TWEETS NATURAL JOIN USERS;
But it seems to be just rolling
Hi Deviad,
NATURAL JOIN uses all column names that are the same between both tables as
conditions.
select * from rappresentanti NATURAL JOIN clienti;
is the same as:
select * from rappresentanti r JOIN client c ON r.cognome=c.cognome AND
r.nome=c.nome AND r.vita=c.vita AND r.citta=c.citta
'405','Williams','Al','519Watson','Grant','MI','49219',402.75,1500,'12');
> insert into clienti
> values
> ('412','Adams','Sally','16Elm'
stebin.com/f50d77dcf
On that database, this query works:
select CodCliente, Cognome, Nome from Ordini NATURAL JOIN Clienti where
Data='2002-09-05';
whereas this one does not:
select *
from rappresentanti NATURAL JOIN clienti;
I pasted the database in there.
Deviad ha scritto:
&g
lues
('412','Adams','Sally','16Elm','Lansing','MI','49224',1817.5,2000,'03');
insert into clienti
values
('522','Nelson','Mary','108Pine','Ada','MI','49441',98.
Thank you.
On Wed, 21 Jan 2009, c...@l-i-e.com wrote:
The natural join will JOIN on *all* the fields whose names match, not just the
ones you want it to.
In particular, the JOIN is matching up .expires and .expires with "="
You then use WHERE to get only the ones with &quo
The natural join will JOIN on *all* the fields whose names match, not just the
ones you want it to.
In particular, the JOIN is matching up .expires and .expires with "="
You then use WHERE to get only the ones with ">"
This is a tautology: There are NO records
tural join'.
I would have thought that the following two queries are equivalent:
1) select t.name,t.expires,d.expires from domains as d natural join temp as t
where d.expires>t.expires;
2) select t3.name,t.name,t.expires,d.expires from t3,domains as d,temp as t
where t.nam
Warnings: 0
>
> mysql> insert into test_2 values (2,'d'),(3,'e'),(4,'f');
> Query OK, 3 rows affected (0.00 sec)
> Records: 3 Duplicates: 0 Warnings: 0
>
> mysql> select * from test_1 NATURAL JOIN test_2;
>
ery OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from test_1 NATURAL JOIN test_2;
+--+---+--+--+
| id | value | id | val |
+--+---+--+--+
|2 | b |2 | d|
|3 | c |3 | e|
+--+---
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