Querying one database and using the results to update another

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Hi,
I'm trying to create a stored procedure with a mysql Database that queries on one database table and uses the results to update another database table.

I'm not sure how to go about this. Any advice/solutions would be much appreciated!

Here's a piece of sample code to give you an idea of what I'm attempting to do.

SAMPLE CODE:

SQL

DELIMITER //
CREATE PROCEDURE()
BEGIN
SELECT @count := COUNT(col) FROM DB1.TBL1;
UNION
UPDATE DB2.TBL2 SET @count = col;
END//

Posted 16-Nov-10 13:30pm

d.allen101

Updated 16-Nov-10 18:50pm

thatraja

v2

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Rod Kemp · Answer 1 · 2010-11-17T02:04:00

Well for starters in the UPDATE statement the the SET section is backwards it should be SET col = @count and you haven't declared the @count variable, not sure if this last part matters in MySql though.

However something else to try is this[^].
Or see if this, which is just from the link, works.

SQL

UPDATE DB2.TBL2 a, DB1.TBL1 b
SET a.col= COUNT(b.col)