How to Short-Circuit SQL Where Clause

Question

I am trying to perform the following query in SQL server:

declare @queryWord as nvarchar(20) = \'asdas\'

SELECT  * FROM TABLE_1 
WHERE (ISDATE(@queryWord) =         


        

Answer 1

It can be "simulated" with a CASE statement. But you have to make the first condition giving a TRUE value to avoid checking of the 2nd condition :

declare @queryWord as nvarchar(20) = 'asdas'

SELECT  * 
FROM TABLE_1
WHERE (CASE 
       WHEN ISDATE(@queryWord) = 0 THEN 0 
       WHEN TABLE_1.INIT_DATE = CONVERT(Date, @queryWord) THEN 1
       ELSE 0 END) = 1