Is it possible have case statement inside a case statement

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Is it possible to have a case statement inside a when in case statement. Kinda tricky question. But it is as simple as having a case statement on the when clause of a case statement.

Quote:
An expression of non-boolean type specified in a context where a condition is expected

Am not really sure if what I've done so far will work.. but I wan't that to work that way.

What I have tried:

(CASE WHEN @variable = 1 THEN (CASE WHEN (CASE WHEN tbl_column_id IN(SELECT tbl_column_id FROM Table THEN 1 END)) AND (CASE WHEN othr_tbl_column_id NOT IN(SELECT othr_tbl_column_id FROM OtherTable THEN 0 END)) THEN 1 ELSE 0 END)
END)

Posted 7-Jun-18 5:19am

Member 11922912

Updated 7-Jun-18 6:12am

v3

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Richard Deeming · Answer 1 · 2018-06-07T06:14:00

Solution 2

Try something like this:

SQL

CASE 
    WHEN @variable = 1 THEN CASE 
        WHEN tbl_column_id IN (SELECT tbl_column_id FROM Table) AND othr_tbl_column_id IN (SELECT othr_tbl_column_id FROM OtherTable) THEN 1 
        ELSE 0 
    END
END

Posted 7-Jun-18 6:14am

Richard Deeming

Comments

#realJSOP 7-Jun-18 13:12pm

I came back to post exactly that... :)

#realJSOP · Answer 2 · 2018-06-07T05:26:00

Yes, you can use nested case statements, but it gets real ugly real fast. Try this:

SQL

CASE WHEN @variable = 1 
     THEN (CASE WHEN CASE WHEN tbl_column_id IN(SELECT tbl_column_id FROM Table) 
                          THEN 1 
                          ELSE 0 
                          END
                     AND CASE WHEN othr_tbl_column_id NOT IN(SELECT othr_tbl_column_id FROM OtherTable) 
                              THEN 0 
                              ELSE 1 
                              END 
      ELSE 0 END