There are cases when using NULL in an SQL database is desirable. However, there are always alternatives.
Read moreOptimising or fixing SQL queries: how to ask for help
If you need free help or paid support, you should phrase your questions correctly and provide the necessary information.
Read moreWhat does NULL mean in SQL?
Does NULL mean “no value”? Or does it mean “an unknown value”? Its semantics and history are ambiguous and inconsistent.
Read moreNULL comparisons in MySQL, PostgreSQL, and SQLite
Any comparison involving at least one NULL operand will return NULL. However, SQL supports operators to easily write NULL-safe comparisons.
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