CODEWITHSUNDEEP
sqlcase
rock
rock

Reputation: 705

Eliminate division by zero using an SQL Server CASE statement

I am trying to eliminate this division by zero error using CASE in my T-SQL SELECT statement. For some reason, I keep getting the error. Here is my logic.

SELECT 
    CASE 
       WHEN tb1.wpf = 0.000 THEN '0.000' 
       ELSE SUM(tb2.weight/tb1.wpf) 
    END AS Average 
FROM Table1 tb1, table2 tb2 
GROUP BY tb1.wpf

I did not include joins and all my logic to keep my question specific to this case. How can I get rid of this error?

Upvotes: 2

Views: 4141

Answers (1)

bluevector
bluevector

Reputation: 3493

The CASE is going to be applied to the aggregate, not individual bits. Try this:

SELECT SUM(Average) FROM (
    SELECT 
            CASE 
               WHEN tb1.wpf = 0 THEN 0
               ELSE tb2.weight / tb1.wpf
            END AS Average 
        FROM Table1 tb1, table2 tb2 
) a

Upvotes: 3

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