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Is it possible to use an IF clause within a WHERE clause in MS SQL?
Example:
WHERE IF IsNumeric(@OrderNumber) = 1 OrderNumber = @OrderNumber ELSE OrderNumber LIKE '%' + @OrderNumber + '%'
Use a CASE statement
UPDATE: The previous syntax (as pointed out by a few people) doesn’t work. You can use CASE as follows:
Or you can use an IF statement like @N. J. Reed points out.