how to use if under where condition ?

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i white q query fo Update :

SQL

UPDATE tblFavorite
SET 
tblFavorite.ItemID=tblFavoritetemp.ItemID,
tblFavorite.ItemTitle = tblFavoritetemp.ItemTitle,
FROM tblFavoritetemp  
WHERE
   tblFavorite.CategoryID = tblFavoritetemp.CategoryID AND IF (tblFavorite.ExDate <> null) begin  (DATEDIFF(minute, tblFavorite.ExDate, GETDATE())) <= 0         end

but giv error on : IF (tblFavorite.ExDate <> null)

it say : Incorrect syntax near the keyword 'IF'.
Msg 102, Level 15, State 1, Line 8
Incorrect syntax near 'DATEDIFF'.
__________________________
PLZ help me ...

Posted 29-Jun-14 23:34pm

‫محم د‬‎

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Magic Wonder · Accepted Answer · 2014-06-29T23:37:00

Try This.

XML

UPDATE tblFavorite
SET
tblFavorite.ItemID=tblFavoritetemp.ItemID,
tblFavorite.ItemTitle = tblFavoritetemp.ItemTitle,
FROM tblFavoritetemp
WHERE
tblFavorite.CategoryID = tblFavoritetemp.CategoryID 
AND 
CASE WHEN (tblFavorite.ExDate <> null) THEN DATEDIFF(minute, tblFavorite.ExDate, GETDATE())) ELSE 0 END <= 0

Hope this will help you.

Manoj Kumar Choubey · Accepted Answer · 2014-06-29T23:46:00

SQL

UPDATE tblFavorite
SET
tblFavorite.ItemID=tblFavoritetemp.ItemID,
tblFavorite.ItemTitle = tblFavoritetemp.ItemTitle,
FROM tblFavoritetemp
WHERE
   tblFavorite.CategoryID = tblFavoritetemp.CategoryID
  CASE WHEN (tblFavorite.ExDate IS NOT NULL) THEN DATEDIFF(minute, tblFavorite.ExDate, GETDATE())) ELSE 0 END <= 0

how to use if under where condition ?

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