# Avoid null values

Hi,

I have databes with

AA           BB              CC          DD
5               6                 7              0

but sometimes i have this:
AA           BB              CC          DD
5               6                 0              8

I have to do this (AA+BB+CC+DD)/100

I want that SQL exclude 0 or null during dividing.

1. (AA+BB+CC)/100
2. (AA+BB+DD)/100

Thx.
Asked:
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Commented:
To exclude NULL, u can use the ISNULL function to substitue NULL values with what u specify

eg.ISNULL(AA, 0)  + ISNULL(BB, 0)  + ISNULL(CC, 0)  + ISNULL(DD, 0)

ISNULL(DD, 0)  wil give 0 if DD has a  NULL value

In your case, since you are dividing by a finite number, u don't need to worry about the 0s

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Commented:
You can try this:

Select (AA+BB+CC) / nullif(100, 0)

OR

use CASE statement to avoid null:

Select Case when divisor=0 then null Else (AA+BB+CC) / divisor End ,,,

In your case, 100 is divisor.

The first example is neater though
0

Commented:
ISNULL ( check_expression , replacement_value )
0
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