Why select table1.colA + table2.colA = null ???

Question

Why select table1.colA + table2.colA = null ???

m0n

Newbie

Points: 5
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November 12, 2011 at 8:14 pm

#262656

Hello
When I select table1.colA + table2.colA it return null value when colA is 0
At table1.colA and table2.colA I already use isnull function to convert null to 0 before
Please suggest.
Thank you very much.
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John Michael Robertson SSC Eights! Points: 988 More actions · Answer 1

Would you be able to provide a little more information to your situation? Some sample data and the SQL you use that generates the NULL value would be very helpful.

viiki.seth Ten Centuries Points: 1127 More actions · Answer 2

It will return if either of the operands have null. You said you are using isnull, but the code you have shown doesnt have that.

sami.sqldba Ten Centuries Points: 1248 More actions · Answer 3

Hi

Can you provide with some data of each table so that i can get some idea...

for the time being if any side of the column have null value result will be null

Thanks & Regards
Syed Sami Ur Rehman
SQL-Server (Developer)
Hyderabad
Email-sami.sqldba@gmail.com

mister.magoo SSC-Forever Points: 47174 More actions · Answer 4

m0n (11/12/2011)
Hello
When I select table1.colA + table2.colA it return null value when colA is 0
At table1.colA and table2.colA I already use isnull function to convert null to 0 before
Please suggest.
Thank you very much.

That could happen if you are using an OUTER join and one of the tables has a row that does not have a corresponding row in the other table.

MM

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