Question

Need some small help with some SQL. I am using a VARCHAR value to determine in a case which logic to use in WHERE clause but I am having some issues writing this case statement.

where 
   (CASE WHEN @p_flag = 'ATA' 
            THEN (@p_start_ata IS NULL AND @p_end_ata IS NULL) OR (vso.poa_ata between @p_start_ata and @p_end_ata)
         ELSE (@p_start_atd IS NULL AND @p_end_atd IS NULL) OR (vso.pol_atd between @p_start_atd and @p_end_atd)
)

Line 93 Incorrect syntax near the keyword ‘IS’.

Its probably a minor error but its frustrating me. Maybe there is a better way of writing this? Thanks!

Answer 1

Like said before you can not use a case statement like you are doing it. So this might be a suggestion:

WHERE 
    (
        @p_flag = 'ATA'
        AND 
            (
                (@p_start_ata IS NULL AND @p_end_ata)
                OR (vso.poa_ata between @p_start_ata and @p_end_ata)
            )
    )
    OR
    (
        NOT @p_flag = 'ATA'
        AND 
            (
                (@p_start_atd IS NULL AND @p_end_atd IS NULL)
                OR (vso.pol_atd between @p_start_atd and @p_end_atd)
            )
    )