在 where 子句中使用 CASE 表达式

Question

I have a stored proc with 2 parameters, both integer

I need to use case statement inside where clause but i could not get it right

where 
dbo.StockTransfer.BranchId = @branchId 
AND
CASE WHEN IsNumeric(@roleId) = 1 
THEN 
dbo.StockTransfer.StatusId !=12    
ELSE
dbo.StockTransfer.StatusId NOT in (12, 13)  
  END

order by dbo.StockTransfer.StatusId ASC

I am getting an error in 'dbo.StockTransfer.StatusId !=12'

Msg 102, Level 15, State 1, Procedure GetDeliveryList, Line 44 [Batch Start Line 0]
Incorrect syntax near '.'.

Answer 1

Don't bother. Just use regular logic:

where dbo.StockTransfer.BranchId = @branchId and
      ( (IsNumeric(@roleId) = 1 and 
         dbo.StockTransfer.StatusId <> 12
        ) or
        (IsNumeric(@roleId) = 0 and
         dbo.StockTransfer.StatusId not in (12, 13)
        )
     ) 

This doesn't handle NULL values, but that can easily be added.

Actually, I might simplify this to:

where dbo.StockTransfer.BranchId = @branchId and
      dbo.StockTransfer.StatusId <> 12 and
      (IsNumeric(@roleId) = 1 or
       dbo.StockTransfer.StatusId <> 13
      )

Answer 2

Given the newest comments about what you want to return I think it would be something like this. I added lots of white space for clarity on the parenthesis.

where dbo.StockTransfer.BranchId = @branchId 
    AND 
    (
        ( 
            @roleId = 1
            AND
            StatusId in (13, 14)
        )
        OR
        (
            @roleId <> 1
            AND
            StatusId = 14
        )
    )