- SQL Introduction
- SQL Select Query
- SQL Where Query
- SQL Joins Query
- SQL Update
- SQL Count
- SQL Sum
- SQL Operators
- SQL Like
- SQL Group By
- SQL Insert Into
- SQL Inner Join
- SQL Left Join
- SQL Right Join
- SQL Full Join
- SQL Exists
- SQL Null
- SQL Stored Procedures
- SQL Any
- SQL Self Join
- SQL Top Statement
- SQL Delete
- SQL Order By
SQL Null.
NULL is an SQL reserved keyword used to identify the Null marker.
NULL means “a missing unknown value” and it is treated somewhat differently from other values.