Question

I have a problem which i thought one of the questions would solve at the bottom but i still have a problem. The issue is my case statement is wrong (but runs without an error) but unsure what else i am missing.

My aim is, if DueDate IS NULL because there is no record in Table2 therefore all i want is for this value to be displayed as ‘No’ and not ‘NULL’. I added “IsNull” into my code but hasnt solved my problem. I have seen ISNULL() and COALEASE() on these forums but unable to get my desired result

Here is my working code below:

SELECT 
    Client, 
    COUNT(*) AS ReadyRecords, 
    (SELECT COUNT(*) FROM Table1 EPR WHERE actioned=8 AND EPR.Client=Table1.Client) AS Outstanding, 
    (SELECT TOP 1 
        CASE 
            WHEN DueDate < GETDATE() THEN 'Yes' 
            WHEN DueDate IS NULL THEN 'No' 
        ELSE 'No' 
        END AS DueDate
    FROM Table2 GL WHERE GL.Client=Table1.Client ORDER BY DueDate) AS DueDate

    FROM Table1 WHERE Actioned=2 GROUP BY Client

EDIT:

Current Result Set:

Client   | ReadyRecords  |  Outstanding  |  DueDate

Test     |     42        |      54       |   NULL
Stack    |     150       |      10       |   NULL
JBloggs  |     32        |      28       |   Yes
DBloggs  |     2         |      17       |   Yes
Overflow |     1         |      1        |   No

Desired Result Set:

Client   | ReadyRecords  |  Outstanding  |  DueDate

Test     |     42        |      54       |   No
Stack    |     150       |      10       |   No
JBloggs  |     32        |      28       |   Yes
DBloggs  |     2         |      17       |   Yes
Overflow |     1         |      1        |   No

Table 1:

id      |  Client   |   Actioned  | etc...

5245    |  Test     |      8      | etc...
....so on

Table 2:

id   |   Client   |   DueDate

1    |  JBloggs   | 2012-12-01 00:00:00.000
2    |  DBloggs   | 2012-12-05 00:00:00.000
3    |  Overflow  | 2012-12-12 00:00:00.000

Let me know if you need anything else.

Similar/Related Questions:

• Using case in a sql select statement
• T-SQL CASE Clause: How to specify WHEN NULL

Answer 1

You need to apply the ISNULL() or COALESCE() function to the whole inline subquery, like this:

SELECT 
    Client, 
    COUNT(*) AS ReadyRecords, 
    (SELECT COUNT(*) FROM Table1 EPR 
     WHERE actioned=8 AND EPR.Client=Table1.Client
    ) AS Outstanding, 

    COALESCE(
        (SELECT TOP 1 
            CASE 
                WHEN DueDate < GETDATE() THEN 'Yes' 
            END AS DueDate
        FROM Table2 GL WHERE GL.Client=Table1.Client ORDER BY DueDate
        ), 'No' 
    ) AS DueDate

FROM Table1  WHERE Actioned=2  GROUP BY Client ;

or move the CASE expression there:

SELECT 
    Client, 
    COUNT(*) AS ReadyRecords, 
    (SELECT COUNT(*) FROM Table1 EPR 
     WHERE actioned=8 AND EPR.Client=Table1.Client
    ) AS Outstanding, 

    CASE WHEN 
           (SELECT TOP 1 
              DueDate
            FROM Table2 GL WHERE GL.Client=Table1.Client ORDER BY DueDate
           ) < GETDATE() 
        THEN 'Yes'
        ELSE 'No'
    END AS DueDate

FROM Table1  WHERE Actioned=2  GROUP BY Client ;