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SQL Server Divide columns and handle divide by zero

Posted on 2015-01-25
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In SQL Server (2012), I want to divide the values of 2 columns. There are cases where there will be division by zero. I want to do the calculation and handle the division by zero gracefully. A simple example is AB / Hits to get Average. Some AB fields will be zero. Some sort of If statement? If AB = 0, then Average = ".000", else AB/Hits? Thanks for any help.
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Question by:dodgerfan
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Simon earned 2000 total points
ID: 40569305
Two choices:
1. Use a where clause to exclude the rows with zero denominators.
2. Use a case statement to set the zero denominators to null.

Both demonstrated below...
declare @t1 table (id int,num1 int,num2 int)

insert into @t1
select 1,1,1 union all
select 2,3,2 union all
select 3,0,1 union all
select 4,1,0  union all
select 5,1,null union all
select 6,null,6 

select id,num1,num2,num1/num2 as IntegerDivision,(0.0+num1)/num2 as DecimalDivision 
from @t1 where num2<>0

select id,num1,num2
,cast(num1 as decimal)/case when num2=0 then null else num2 end as DecimalDivision
from @t1

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