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In this section, we discuss the following SQL keywords and concepts:
The concept of NULL is uniquely important in SQL. Hence, we include a section on the use of NULL, as well as NULL-related functions:
SQL NULL
SQL ISNULL Function
SQL IFNULL Function
SQL NVL Function
SQL Coalesce Function
SQL NULLIF Function
In addition, we show how SQL can be used to accomplish some of the more complex operations:
SQL UNION >>
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