Posted By

wolfie on 02/21/08

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sql
update

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Last Edited at 02/21/08 11:56am

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Update from select

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TO just SET TO a predetermined VALUE (TRUE, FALSE, 1, 'foo', etc.)
 
UPDATE tblDestination
SET tblDestination.col=VALUE
WHERE EXISTS (
SELECT col2.value
FROM tblSource
WHERE tblSource.join_col=tblDestination.join_col
AND tblSource.constraint=VALUE
)
 
More advanced (sets VALUE TO VALUE IN secondary SELECT statement):
 
UPDATE tblDestination
SET tblDestination.col=(SELECT col2.value FROM tblSource WHERE tblSource.join_col=tblDestination.join_col AND tblSource.constraint=VALUE)
WHERE EXISTS (
SELECT col2.value
FROM tblSource
WHERE tblSource.join_col=tblDestination.join_col
AND tblSource.constraint=VALUE
)