different rdbms operations are delete,update easily and other u find on some other site. •Insert : unary operation •Delete : unary operation •Update : unary operation •Select : unary operation •Project : unary operation •Join : binary operation •Union : binary operation •Intersection : binary operation •Difference : binary operation

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Given a set and a binary operation defined on the set,

the inverse of any element is that element which, when combined with the first, gives the identity element for the binary operation.

If the set is integers and the binary operation is addition, then the identity is 0, and the inverse of an integer k is -k.

If the set is rational numbers and the binary operation is multiplication, then the identity element is 1 and the inverse of any member of the set, x (other than 0) is 1/x.

A binary operator is simply an operator that works with two operands (for example, two numbers). The binary operator is usually written between the two operands.

Examples include the familiar operations of addition, subtraction, multiplication, or division - for example, in:

2 + 3

the "plus" is the binary operator, which works on the two numbers written on either side of it.

What is an operator: Basically a function (calculation rule), written in a special way.

It is not a property. It is the binary operation called multiplication.