Hello!
Simon Green wrote:
What I am trying to do in MySQL.
Table1
UserID ProductID Old_UserID
1 2 4
2 3 5
Table2
UserID ProductID
4 Null
5 Null
Table1 has new correct data.
Table2 has old incorrect data.
The link is Table2.UserID and Old_UserID
What I need to do is update Table 2 with the new data from Table 1,
But I can not get this to work..e.g.
UPDATE Table2.ProductID
SET Table2.ProductID = Table1.ProductID
WHERE Table1.Old_UserID = Table2.UserID
REPLACE will not work as these are not KEY fields.
Once I have done the ProductID I should then be able to do the UserID using
the ProductID (as all values in one table are unique).
SELECT
concat('UPDATE Table2 SET ProductID = ',
t1.ProductID,
' WHERE UserID = ',
t1.UserID,
';'
)
INTO OUTFILE
'/tmp/update.sql'
FROM
Table1 t1
LEFT JOIN Table2 t2 ON (t1.Old_UserID = t2.UserID)
WHERE
t2.UserID IS NOT NULL
;
\. /tmp/update.sql
This might help...but better take a look at /tmp/update.sql, before
executing it!!!
Greetings
Ralf
--
Ralf Narozny
SPLENDID Internet GmbH Co KG
Skandinaviendamm 212, 24109 Kiel, Germany
fon: +49 431 660 97 0, fax: +49 431 660 97 20
mailto:[EMAIL PROTECTED], http://www.splendid.de
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