T-SQL: Concatenate something + null=null
Today I have lost 2 hours until I have discovered this rule. I wanted to concatenate the contents of a field in the database with a variable using something like that:
UPDATE TableName
SET FieldName=FieldName + ',' + @value
WHERE ID=@ID
If the value of FieldName is null this operation is very stupid because the result will be null too. In my case I have forced that the field was not nullable (default value: '') and all runs.
posted by Àlex @ 10:31 PM
33 comments
33 Comments:
What about something like this instead of changing the schema?
UPDATE tbl
SET fld = ISNULL(fld, '') + @value
This would ensure that for columns which are null, you would concatenate with a blank string.
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