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Here is an example of what I'm trying to do:
Select
S1.Name as S1Name,
S1.Itemcontent as S1ItemContent,
...
S2.Name as S2Name,
S2.Name as S2ItemContent,
**(S1.OrderValue * 1000*1000 + S2.OrderValue*1000 + S3.OrderValue) as OrderValue**
From (joining s1, s2 and s3 on a particular value)
Order by OrderValue
When S1.OrderValue, S2.OrderValue or S3.OrderValue is a null, then OrderValue becomes a null as well. I want SQL Server to treat nulls as a 0 in this case. How can i do this?
572
In SQL Server, NULL value indicates an unavailable or unassigned value. The value NULL does not equal zero (0), nor does it equal a space (' '). Because the NULL value cannot be equal or unequal to any value, you cannot perform any comparison on this value by using operators such as '=' or '<>'.
For regular SQL, ISNULL(item) can only take one parameter, and thus 90% of these solutions don't work. This will return the value in column_name if it is not null , and 0 if it is null .
In particular, null values must be distinguished from blank values: A null database field means that there is no value for a given record. It indicates the absence of a value. A blank database field means that there is a value for a given record, and this value is empty (for a string value) or 0 (for a numeric value).
You need to incorporate ISNULL() into each item in the @sourcecolumn list in the SELECT clause. The reason it threw an error is because your entire list of columns was wrapped in one statement: ISNULL(col1,col2,col3...,0) you need ISNULL(col1,0),ISNULL(col2,0)...
Using the isNull function, such as
isnull(s1.ordervalue,0)
If the value is null, it uses the alternative value you provided as the second value.
164
COALESCE(Value, 0) or ISNULL(Value, 0)
22
Use T-SQL Coalesce to force a non-null answer. For example:
COALESCE(S1.OrderValue, 0)
...will take the OrderValue value unless it is NULL in which case 0 is taken.
4
Coalesce returns first non null value.
**(coalesce(S1.OrderValue,0) * 1000 + coalesce(S2.OrderValue,0)*1000 + coalesce(S3.OrderValue,0)) as OrderValue
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