Case Statement in Where Clause - SQL Server

using case statement in a where clause

The branches of a case expression can only return values, not additional expressions to be evaluated in the where condition. You could, however, simulate this behavior with the and and or logical operators:

select    *
from      ##ScheduleDetail SD
left join ##HolidayFilterTbl HF on SD.Scheduledate = HF.Testdate
where     (ScheduleDate = testdate) and
          ((HF.IsHoliday = 1 and overtime = 1 and makeup = 0) or
           (overtime = 0 and Makeup = 0)) and
          DOW = 5 
order by  ActivityStartTime

Note that you have makeup = 0 on both branches of the case expression in the question (or both sides of the or in the answer), so you could extract it out of it and simplify the condition a bit:

select    *
from      ##ScheduleDetail SD
left join ##HolidayFilterTbl HF on SD.Scheduledate = HF.Testdate
where     ScheduleDate = testdate and
          makeup = 0 and
          ((HF.IsHoliday = 1 and overtime = 1) or
           overtime = 0) and
          DOW = 5 
order by  ActivityStartTime

SQL Switch/Case in 'where' clause

declare @locationType varchar(50);
declare @locationID int;

SELECT column1, column2
FROM viewWhatever
WHERE
@locationID = 
  CASE @locationType
      WHEN 'location' THEN account_location
      WHEN 'area' THEN xxx_location_area 
      WHEN 'division' THEN xxx_location_division 
  END

SQL use CASE statement in WHERE IN clause

No you can't use case and in like this. But you can do

SELECT * FROM Product P    
WHERE @Status='published' and P.Status IN (1,3)
or @Status='standby' and P.Status IN  (2,5,9,6)
or @Status='deleted' and P.Status IN (4,5,8,10)
or P.Status IN (1,3)

BTW you can reduce that to

SELECT * FROM Product P    
WHERE @Status='standby' and P.Status IN (2,5,9,6)
or @Status='deleted' and P.Status IN (4,5,8,10)
or P.Status IN (1,3)

since or P.Status IN (1,3) gives you also all records of @Status='published' and P.Status IN (1,3)

SQL Server Case statement in WHERE Clause

As a case statement, you would write this as:

CASE WHEN f.PartName = 'B' and e.RecoverableFlag = 1 then 1
     WHEN f.ParName = 'A' then 1
     ELSE 0   END   ) = 1

Is this the logic you want?

Many would think that the case statement is irrelevant here, and instead use:

WHERE ((f.PartName = 'B' and e.RecoverableFlag = 1) or (f.partName <> 'B')) . . .

Case statement in where clause to search for none specific values

It looks like you are just trying to do

where
(@value = 'A' and (option like '%gre%' or option like '%sma%')) or
(@value = 'B' and (option like '%tin%' or option like '%mic%')) or
(@value = 'C' and (option like '%gig%' or option like '%mul%')) ;

WHERE clause on CASE Statement alias

WHERE clause does not have any idea about aliased in SELECT list.

Reason: There's a logical processing order in MS SQL server (see link here) and in it WHERE is computed before the SELECT list

So one way is to create an inner query and put where outside.

Select * from
(
SELECT 
ma.CustomerID,
ma.FirstName,
ma.LastName,
(
    CASE WHEN (
        sa.Active < 1
            OR
        ma.Active < 1
            OR
        (sa.CancelDate IS NOT NULL AND sa.CancelDate <= GETDATE())
            OR
        (ma.CancelDate IS NOT NULL AND ma.CancelDate <= GETDATE())
            OR
        (sa.ExpireDate IS NOT NULL AND DATEADD(dd, sa.Extension + 1, sa.ExpireDate) <= GETDATE())
    ) THEN
        0
    ELSE
        1
    END
) as IsAccountActive
FROM MasterAccounts ma
INNER JOIN SubAccounts sa
ON sa.CustomerID = ma.CustomerID
INNER JOIN MasterAccountData mad
ON mad.CustomerID = sa.CustomerID
WHERE mad.AccountDataTypeID = 20001
AND mad.Data = '')T
where T.IsAccountActive = 1

Another way is to put case in where clause like

SELECT 
    ma.CustomerID,
    ma.FirstName,
    ma.LastName
    FROM MasterAccounts ma
    INNER JOIN SubAccounts sa
    ON sa.CustomerID = ma.CustomerID
    INNER JOIN MasterAccountData mad
    ON mad.CustomerID = sa.CustomerID
    WHERE mad.AccountDataTypeID = 20001
    AND mad.Data = ''
    AND CASE WHEN (
            sa.Active < 1
                OR
            ma.Active < 1
                OR
            (sa.CancelDate IS NOT NULL AND sa.CancelDate <= GETDATE())
                OR
            (ma.CancelDate IS NOT NULL AND ma.CancelDate <= GETDATE())
                OR
            (sa.ExpireDate IS NOT NULL AND DATEADD(dd, sa.Extension + 1, sa.ExpireDate) <= GETDATE()))
         THEN
            0
        ELSE
            1 
        END =1

SQL Case statement In Where clause: Msg 102, Level 15, State 1

Just use simple logic:

WHERE (@Platform = 1 AND [Windows_PC] = 1) OR
      (@Platform = 2 AND [Mac] = 1) OR
      (@Platform = 3 AND [Linux] = 1) OR
      (@Platform = 4 AND [Android] = 1) OR
      (@Platform NOT IN (1, 2, 3, 4) AND [Windows_PC] = 1)

The condition for "1" is redundant with the else. I'm not sure if that is a typo. If not, you can remove the first condition.

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