Multiply Values of a Particular Column in SQL Server

There is no T-SQL function for getting product of rows in a particular column. For example, say you had a table like this:

 --/////////////////////////////select * from #tbltest order by mydate ascID    MyDate	Value1     1/1/99     102     1/1/99     203     1/1/99     304     2/1/99     405     2/1/99     50--/////////////////////////////

If you want to get product of values for each date, here’s a simple way:

 --/////////////////////////////select mydate, convert(varchar,exp(sum(log(value)))) as productfrom #tblTestgroup by mydate--/////////////////////////////

Added to above solution, the following script is another way to check for zero and negative values using the sign function.

 --/////////////////////////////select mydate,convert(varchar,case sum(case when sign(value) = -1 then 1else 0 end)%2when 1 then -1 else 1 end * exp(sum(log(abs(case when sign(value) <> 0 then value end)))) * min(case when value = 0 then 0 else 1 end)) as productfrom #tblTestgroup by mydateorder by mydate asc--/////////////////////////////
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