Also, if you don't want ot include columns with NULL values in the calculation, you will have to filter those in the WHERE clause:
WHERE YourField is not NULL
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Question
Trap/Suppress Warning
A stored procedure I am running is throwing the warning "Warning: Null value is eliminated by an aggregate or other SET operation."
I would like to trap and suppress this warning within the stored procedure. How do I do that?
I cannot SET ANSI_WARNINGS OFF because I need it on to use indexed views (I think).
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Answers
SET ANSI_WARNINGS OFF
will do it
SET ANSI_WARNINGS ON
will switch it back for
rest of code
see
example below:
DROP TABLE tabcount
--GO
SET NOCOUNT ON
GO
CREATE TABLE tabcount (
pkey int IDENTITY NOT NULL CONSTRAINT pk_tabcount PRIMARY KEY,
col1 int NULL)
GO
INSERT tabcount (col1) VALUES (10)
GO
INSERT tabcount (col1) VALUES (15)
GO
INSERT tabcount (col1) VALUES (20)
GO
INSERT tabcount (col1) VALUES (NULL)
GO
SET ANSI_WARNINGS OFF
SELECT AVG(col1) A1,
AVG(ISNULL(col1,0)) A2,
COUNT(col1) C1,
COUNT(ISNULL(col1,0)) C2,
COUNT(*) C3
FROM tabcount
SET ANSI_WARNINGS ON
GO
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by: SireesPosted on 2006-09-13 at 13:30:16ID: 17515409
I got this from some other EE member:
It means that a field you are performing an aggregate calculation on (e.g. AVG(YourField)) contains NULL values. A NULL cannot be interpreted in operations like this and so any NULL values are ignored.
supposing you have 3 records with the following values
2.00
NULL
2.00
If you were to do an AVG on this column, you'd get the Warning message you have, and the result would be 2.00 (doesn't count the NULL row when working out the average).
However, if you use "AVG(ISNULL(YourField, 0))" then you'd get the correct result of 1.33
So, what you should do if put the ISNULL() around your column