CODEWITHSUNDEEP
sql-serverstored-proceduresif-statementwhere-clause
Asp_Newbie
Asp_Newbie

Reputation: 269

How to use If Statement in Where Clause in SQL?

I need to use if statement inside where clause in sql.

Select * from Customer
WHERE  (I.IsClose=@ISClose OR @ISClose is NULL)  
AND    
(C.FirstName like '%'+@ClientName+'%' or @ClientName is NULL )    
AND 
 if (@Value=2)
  begin
  (I.RecurringCharge=@Total  or @Total is NULL )    
  end
 else if(@Value=3)
begin
(I.RecurringCharge like '%'+cast(@Total as varchar(50))+'%' or @Total is NULL )  
end

Note: This is not the complete code. Everything is defined in SP. I have just written the code that was needed to understand the issue.

Upvotes: 15

Views: 166593

Answers (4)

Mitesh Vora
Mitesh Vora

Reputation: 458

select * from xyz where (1=(CASE WHEN @AnnualFeeType = 'All' THEN 1 ELSE 0 END) OR AnnualFeeType = @AnnualFeeType)

Upvotes: 1

Vishal Suthar
Vishal Suthar

Reputation: 17194

You have to use CASE Statement/Expression

Select * from Customer
WHERE  (I.IsClose=@ISClose OR @ISClose is NULL)  
AND    
    (C.FirstName like '%'+@ClientName+'%' or @ClientName is NULL )    
AND 
     CASE @Value
         WHEN 2 THEN (CASE I.RecurringCharge WHEN @Total or @Total is NULL) 
         WHEN 3 THEN (CASE WHEN I.RecurringCharge like 
                               '%'+cast(@Total as varchar(50))+'%' 
                     or @Total is NULL )
     END

Upvotes: 6

RichardTheKiwi
RichardTheKiwi

Reputation: 107826

SELECT *
  FROM Customer
 WHERE (I.IsClose=@ISClose OR @ISClose is NULL)  
   AND (C.FirstName like '%'+@ClientName+'%' or @ClientName is NULL )    
   AND (isnull(@Value,1) <> 2
        OR I.RecurringCharge = @Total
        OR @Total is NULL )    
   AND (isnull(@Value,2) <> 3
        OR I.RecurringCharge like '%'+cast(@Total as varchar(50))+'%'
        OR @Total is NULL )

Basically, your condition was

if (@Value=2)
   TEST FOR => (I.RecurringCharge=@Total  or @Total is NULL )

flipped around,

AND (isnull(@Value,1) <> 2                -- A
        OR I.RecurringCharge = @Total    -- B
        OR @Total is NULL )              -- C

When (A) is true, i.e. @Value is not 2, [A or B or C] will become TRUE regardless of B and C results. B and C are in reality only checked when @Value = 2, which is the original intention.

Upvotes: 11

Adriaan Stander
Adriaan Stander

Reputation: 166586

Nto sure which RDBMS you are using, but if it is SQL Server you could look at rather using a CASE statement

Evaluates a list of conditions and returns one of multiple possible result expressions.

The CASE expression has two formats:

The simple CASE expression compares an expression to a set of simple expressions to determine the result.

The searched CASE expression evaluates a set of Boolean expressions to determine the result.

Both formats support an optional ELSE argument.

Upvotes: 2

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