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The two general classes of operators are : unary : A unary operator is an operator that operates on only one operand. Here is the format : operator operand. Example: +2460, -300 . binary : An operator is referred to as binary if it operates on two operands. Here is the format :
A subquery is a SQL query nested inside a larger query. 1  The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. 2  A subquery is usually added within the WHERE Clause of another SQL SELECT statement.  You can use the comparison operators, such as >, <, or =.