Abstract: The lack of information within relational databases expressed as NULL values presents a problem in ensuring the quality of data and the information retrieved by SQL queries. This is so ...

In SQL, a common error is caused by incorrect handling of NULL values. For example, comparing a column with NULL using the = operator will always return false, even ...

In contrast, a regular INSERT statement retains the null value instead of inserting a default value. The INSERT ... SELECT * FROM OPENROWSET(BULK...) statement provides the same basic behavior as ...

That suggests that the field value is already null. IsNull () would return false for an empty string.<BR><BR>SQL Server provides the NullIf () function, which does what you want; depending on your ...