Introduction « Subquery « MySQL Tutorial

6.1.1.A subquery is a SELECT statement within another statement.
6.1.2.Using Join in the subquery
6.1.3.Using the aggregate function in subquery
6.1.4.Update with subquery
6.1.5.Using Having to subquery
6.1.6.Delete with subquery
6.1.7.Get the Row Holding the Maximum of a Certain Column with sub query in where clause
6.1.8.The Rows Holding the Group-wise Maximum of a Certain Field
6.1.9.Comparisons Using Subqueries

6.1.10.Find all rows in a table containing a value that occurs twice in a given column
6.1.11.Subqueries in the FROM clause
6.1.12.NULL Subquery with gradter than (>)
6.1.13.A scalar subquery can be part of an expression
6.1.14.The Subquery as Scalar Operand