Formula issue in SQL when one result has 0 value

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This question already has answers here:

You want to check if the denumerator of the division is zero, and return NULL instead in this case. This will cause the division to return NULL as well, which is likely what you want.

Without knowing your RDBMS, here is an implementation that relies on a CASEstatement, which is supported in most (if not all) SQL servers.

SUM(PMCLY.[Net Sale LY]/(
    CASE WHEN PMC.[Net Sales] - PMCLY.[Net Sale LY] = 0 
    THEN NULL 
    ELSE PMC.[Net Sales] - PMCLY.[Net Sale LY]
    END
)) AS 'VAR Vs LY %'

If your RDBMS supports NULLIF, then :

SUM(PMCLY.[Net Sale LY]/(
    NULLIF( PMC.[Net Sales] - PMCLY.[Net Sale LY], 0)
)) AS 'VAR Vs LY %'

Formula issue in SQL when one result has 0 value, You want to check if the denumerator of the division is zero, and return NULL instead in this case. This will cause the division to return NULL as U can make use of a combination of the NULLIF and ISNULL functions. The NULLIF can be used to prevent the divide by zero errors. The ISNULL can be wrapped on the outside, to set a default value in such cases. In your case, that would be 0. Something like this: SELECT ISNULL (10 / NULLIF (0, 0) , 0) -- result = 0 Your code example would look like this:

this will work:

SELECT case when mod((5/(decode(0,0,5,1))),1) = 0 then 0 else (5/(decode(0,0,5,1))) end 
FROM dual;
0

SELECT case when mod((5/(decode(2,0,5,2))),1) = 0 then 0 else (5/(decode(2,0,5,2))) 
end 
FROM dual;
 2.5

for your case :

SELECT sum(case when mod((PMCLY.[Net Sale LY]/(decode((PMC.[Net Sales] - 
PMCLY.[Net Sale LY],0,5,(PMC.[Net Sales] - PMCLY.[Net Sale LY]))),1) = 0 
then 0 else (5/(decode((PMC.[Net Sales] - PMCLY.[Net Sale LY],0,5,(PMC.[Net 
Sales] - PMCLY.[Net Sale LY])))) end 
FROM tablename;

Two Ways to Prevent Division by Zero in SQL, is to use the NULLIF function. NULLIF requires two arguments. If the arguments are equal, NULLIF returns a null value. If they are not equal, NULLIF returns the first value. If none of the comparison values equal the test value, then the expression takes on the value resultx. Again, if the optional ELSE clause isn’t present and none of the comparison values match the test value, the expression receives a null value.

U can make use of a combination of the NULLIF and ISNULL functions. The NULLIF can be used to prevent the divide by zero errors. The ISNULL can be wrapped on the outside, to set a default value in such cases. In your case, that would be 0.

Something like this:

SELECT ISNULL (10 / NULLIF (0, 0) , 0)  -- result = 0

Your code example would look like this:

ISNULL (SUM (PMCLY.[Net Sale LY] / NULLIF ( (PMC.[Net Sales] - PMCLY.[Net Sale LY]), 0 ) ), 0) AS 'VAR Vs LY %'

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