averaging null coulmn in sql

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Hi
I have a stored procedure that I use and i want to average null coulmns: my stored procedure

SQL

ALTER procedure [dbo].[Technology] 
@portRef int 
as
SELECT avg(planned)as Planned,avg(achieved)  as Achieved 
FROM Port inner join Technology on Port.portID = Technology.portRef 
WHERE portRef =@portRef
OR Technology.ShowAll =@portRef

so i bind this stored procedure to a chart using datasource and when the column is null the c# code throw this error
Value was either too large or too small for a Decimal.
how can I handle my stored to avg those null column

Posted 12-Jul-12 22:17pm

kolisa

Updated 12-Jul-12 22:41pm

Prasad_Kulkarni

v2

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Comments

Sunny_Kumar_ 13-Jul-12 4:28am

you can try checking not for null values... I mean like adding a cluase "<column> is not null" in WHERE filter.

AshishChaudha 13-Jul-12 9:36am

mark it as your answer if your issue is solved, so other can refer to the solution

Sergey Alexandrovich Kryukov 18-Mar-13 10:56am

Please stop posting non-answers as "solution". It can give you abuse reports which eventually may lead to cancellation of your CodeProject membership.
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jeyamothi · Accepted Answer · 2012-07-29T22:58:00

Solution 5

you can try case in stored procedure.

VB

case avg(planned)
when null then 0
else avg(planned)
end

Posted 29-Jul-12 22:58pm

jeyamothi

Om Prakash Pant · Accepted Answer · 2012-07-12T22:38:00

Solution 1

Try:

SQL

SELECT 
AVG(ISNULL(planned, 0)) as Planned, 
avg(ISNULL(achieved,0)) as Achieved
FROM Port inner join Technology on Port.portID = Technology.portRef
WHERE portRef =@portRef OR Technology.ShowAll =@portRef

Posted 12-Jul-12 22:38pm

Om Prakash Pant

Comments

AshishChaudha 13-Jul-12 9:33am

my 5!

kolisa 30-Jul-12 3:55am

it still returns null value

**Zoltán Zörgő** · Accepted Answer · 2012-07-12T22:47:00

First of all, you need to decide what a null value should mean to you: 0 or need to be skipped: avg(null,1,2)==1 or ==1.5
In the first case you can use COALESCE[^], like this:

SQL

SELECT avg(COALESCE(planned,0))as Planned,avg(COALESCE(achieved,0)) as Achieved...

In the second case you can filter selection with

SQL

... WHERE planned is not null

but this way you can calculate only one average per select. But this is no actual problem in a stored procedure.

jeyamothi · Accepted Answer · 2012-07-12T23:33:00

Solution 3

you can check the null check in your c# code before bind the datasource

or you can try the decode in your stored procedure.
eg:

decode(avg(planned), null,0,avg(planned))

Posted 12-Jul-12 23:33pm

jeyamothi

Comments

kolisa 30-Jul-12 3:58am

decode is unknown build in function

jeyamothi 30-Jul-12 4:49am

you try in your stored procedure code not in c# code behind file.

jeyamothi 30-Jul-12 4:50am

are you using sql or oracle

kolisa 30-Jul-12 4:56am

Got it Thanks

jeyamothi 30-Jul-12 5:00am

thank you for your rating

sandeep nagabhairava 30-Jul-12 5:46am

nice work...

averaging null coulmn in sql

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