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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 :
Correlated subquery. In a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values from the outer query. Because the subquery may be evaluated once for each row processed by the outer query, it can be inefficient.