MS SQL Server Concepts and Programming Question:
What Happens If NULL Values Are Involved in String Operations?
Answer:
If NULL values are involved in string operations, the result will be string NULL values. The following tutorial script shows you some good examples:
SELECT 'GlobalGuideLine'+NULL;
GO
----------
NULL
SELECT LEN(NULL);
GO
----------
NULL
SELECT REVERSE(NULL);
GO
----------
NULL
SELECT 'GlobalGuideLine'+NULL;
GO
----------
NULL
SELECT LEN(NULL);
GO
----------
NULL
SELECT REVERSE(NULL);
GO
----------
NULL
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