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Cast to decimal

This is probably an easy fix but I can't seem to get it working.

select columnA, cast( (columnaA/10) as decimal  (10, 5)) as NewColumn 
 from tableA

I want to divide column A by 10 but I want my new column to show the decimal places. Right now it is showing 5 deciaml places but only as zero.

When I divide 3/10 I want the new column to show 0.3 but right now its just showing 0.00000
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asked Oct 11, 2011 at 08:39 AM in Default

sqlnewb gravatar image

sqlnewb
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3 answers: sort voted first

Cast the column before the divide

select columnA, cast(columnA as decimal  (10, 5))/10 as NewColumn 
from tableA
without it, it is doing integer division 3/10 = 0 then casting that as decimal(10,5) = 0.00000
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answered Oct 11, 2011 at 08:44 AM

Kev Riley gravatar image

Kev Riley ♦♦
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@Kev Riley But this will definitely result in more than 5 decimal digits in the answer, so using 10.0 instead of 10 and only then casting to decimal(10, 5) could be a better choice.
Oct 11, 2011 at 08:47 AM Oleg

@Oleg yes it does, but I was just trying to show the OP where they had gone wrong - hopefully it will serve as a learning exercise and the OP can rework the query to suit their requirements. If 10 wasn't hard-coded and was an int variable or another column, changing it to 10.0 isn't as easy, and you would be back to casting/converting either the divisor or the dividend to a decimal type.

Hopefully all the answers here show that :)
Oct 11, 2011 at 08:57 AM Kev Riley ♦♦
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This happens because your ColumnA is int and 10 is implicitly int as well. Try this instead, and you will get results you want:

select 
    columnA, cast((columnaA/10.0) as decimal  (10, 5)) as NewColumn 
    from tableA

The idea is that when you divide by 10.0 rather than by 10 then you avoid the integer division because the decimals are higher in the food chain than integers.

Oleg
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answered Oct 11, 2011 at 08:44 AM

Oleg gravatar image

Oleg
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You need to cast each number to decimal as well as the total, for example:

select columnA, CAST(CAST(columnaA AS DECIMAL(10,5)) / CAST(10.0 AS DECIMAL(10,5)) AS DECIMAL(10,5))as NewColumn 
from tableA
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answered Oct 11, 2011 at 08:45 AM

Mrs_Fatherjack gravatar image

Mrs_Fatherjack
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asked: Oct 11, 2011 at 08:39 AM

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Last Updated: Oct 11, 2011 at 08:39 AM