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Can I execute multiple UPDATE commands in a single SQL Query?

Posted on 2009-05-05
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Last Modified: 2012-05-06
Hi,

I have a MySQL table for which I would like to update several lines on a single update. This would be:

UPDATE myTable SET Field1='A' WHERE Field2 like '123' and MyID = 0;
UPDATE myTable SET Field1='B' WHERE Field2 like '123' and MyID = 1;

Can this be done in a single SQL query in MySQL 5.0? (I actually need to execute 20 each time!)

Any help would be appreciated.

Thanks,

James
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Question by:James Atkin
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3 Comments
 
LVL 25

Expert Comment

by:reb73
ID: 24306194
Separate each updatable field with a comma, like this -

UPDATE myTable SET
Field1='A',  
Field1='B'
WHERE Field2 like '123' and MyID = 0;
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Accepted Solution

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reb73 earned 2000 total points
ID: 24306240
Actually, ignore my previous post  (24306194), i misinterpreted your question..

It would be more like this -

UPDATE myTable SET
      Field1= case when myid = 1 then 'A'
                   when myid = 2 then 'B'
                   when myid = 3 then 'C'
                   -- and so on
                   else Field1
              end
WHERE Field2 like '123';
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LVL 4

Author Closing Comment

by:James Atkin
ID: 31578080
Excellent, thanks!
That saves a heck of a lot of unnecessary calls! :-)
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