# SQL operators

## Operator:

An operator is a special symbol which used to perform a specific operation.

## SQL operators:

SQL operators are the reserved words or special symbols or characters that are used to perform specific operations.

## Types of SQL operators:

1. SQL Arithmetic Operators
2. SQL Comparison Operators
3. SQL Logical Operators

## 1. SQL Arithmetic Operators:

Let us consider the two variables a and b, where a hold 20 and b hold 40.

 Operator Description Example + It is used to add the operands values. a + b will give 60 – It is used to subtract right hand operand from left hand operand. a – b will give -20 * It is used to multiply the operands values. a * b will give 800 / It is used to divide left hand operand by right hand operand b / a will give 2 % It is used to modulo divide left hand operand by right hand operand. b % a will give 0

## 2.   SQL Comparison Operators:

Let us consider the two variables a and b, where a hold 20 and b hold 40.

 Operator Description Example = It is used to check that the values of two operands are equal or not, if yes then condition becomes true. (a = b) is not true. != It is used to check that the values of two operands are equal or not, if values are not equal then condition becomes true. (a != b) is true. <> It is used to check that the values of two operands are equal or not, if values are not equal then condition becomes true. (a <> b) is true. > It is used to check that the value of left operand is greater than the value of right operand, if yes then condition becomes true. (a > b) is not true. < It is used to check that the value of left operand is less than the value of right operand, if yes then condition becomes true. (a < b) is true. >= It is used to check that the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. (a >= b) is not true. <= It is used to check that the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. (a <= b) is true. !< It is used to check that the value of left operand is not less than the value of right operand, if yes then condition becomes true. (a !< b) is false. !> It is used to check that the value of left operand is not greater than the value of right operand, if yes then condition becomes true. (a !> b) is true.

## 3.   SQL Logical Operators

 Operator Description ALL It is used to compare a value to all values in another value set. AND It allows the existence of multiple conditions in an SQL statement’s WHERE clause. ANY It is used to compare a value to any applicable value in the list according to the condition. BETWEEN It is used to search for values that are within a set of values, given the minimum value and the maximum value. EXISTS It is used to search for the presence of a row in a specified table that meets certain criteria. IN The IN operator is used to compare a value to a list of literal values that have been specified. LIKE It is used to compare a value to similar values using wildcard operators. NOT It reverses the meaning of the logical operator with which it is used. Eg: NOT EXISTS, NOT BETWEEN, NOT IN, etc. This is a negate operator. OR It is used to combine multiple conditions in an SQL statement’s WHERE clause. IS NULL It is used to compare a value with a NULL value. UNIQUE It searches every row of a specified table for uniqueness (no duplicates).

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