在SQL CASE where子句中使用BETWEEN

Question

I Have a form, where the user pulls a report. In the form they can choose a start date and an end date, or pass through a null for both values. If they choose null, it returns all records where effectivedate < GETDATE() The CASE statement doesn't seem to like between, nor does it like '<' operators

Here is my script

SELECT * FROM tbReport
WHERE 
    EffectiveDate 
    CASE 
        WHEN (@StartDate IS NOT NULL AND @EndDate IS NOT NULL) 
        THEN BETWEEN (@StartDate AND @EndDate)          
         ELSE 
                  THEN < GETDATE()

    END

Answer 1

You could rewrite it without a case, like:

SELECT  * 
FROM   tbReport
WHERE   (
            @StartDate is not null 
            and 
            @EndDate is not null
            and 
            EffectiveDate between @StartDate AND @EndDate
        )
        or
        (
            (
                @StartDate is null 
                or 
                @EndDate is null
            )
            and 
            EffectiveDate < getdate()
        )

Answer 2

Assuming this is SQL Server, you can simplify this by using isnull:

select *
from tbReport
where EffectiveDate between isnull(@StartDate, '1 Jan 1990')
      and isnull(@EndDate, getdate())

Answer 3

Something like this should work, I havent checked the syntax is correct though.

SELECT * FROM tbReport
WHERE EffectiveDate < IsNull(@EndDate,GetDate())
AND EffectiveDate > IsNull(@StartDate,'01/01/1979')

Answer 4

Your syntax for CASE is all wrong here.. Try this instead:

SELECT * FROM tbReport
WHERE 
    (@StartDate is null and @EndDate is null and EffectiveDate < GetDate()) or 
    (@StartDate is not null and @EndDate is not null and 
     EffectiveDate >= @StartDate and EffectiveDate <= @EndDate)

Answer 5

the SQL statement is not written correct. Case will not conditionally chose the evaluated code. You can look to the case as a value, so you have to put an operator between the case and the other operand.

One of the multiple ways of writing this would be:

where 
case when @StartDate IS NOT NULL AND @EndDate IS NOT NULL and EffectiveDate BETWEEN (@StartDate AND @EndDate)   then 1
case when (@StartDate IS NULL OR @EndDate IS NULL) and EffectiveDate <getdate() then 1
else 0 end = 1

If you do not want to write it with case you can chose one of the solutions before, but they use a discrete starting date.

Answer 6

WHERE 

(SR.RecCreateTS BETWEEN  ( CASE WHEN  @SubmittedBegining IS NOT NULL  THEN @SubmittedBegining ELSE SR.RecCreateTS END )
                            AND ( CASE WHEN  @SubmittedEnding IS NOT NULL   THEN @SubmittedEnding ELSE SR.RecCreateTS END )
                            )