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Not Operator in SQL

Not Operator in SQL

NOT Operator in SQL

The NOT operator is a logical negation operator used to reverse the result of a condition or predicate.


? Usage:

SELECT column1, column2, ...FROM table_nameWHERE NOT condition;

? Examples:

  1. Select employees who are not in department 10:

SELECT employee_name, department_idFROM employeesWHERE NOT department_id = 10;

Equivalent to:

WHERE department_id <> 10;

  1. Select customers who do not have orders in 2023:

SELECT customer_nameFROM customersWHERE NOT EXISTS (    SELECT 1 FROM orders    WHERE orders.customer_id = customers.customer_id      AND order_date BETWEEN '2023-01-01' AND '2023-12-31');

? Notes:

  • NOT can be used with any condition to invert its truth value.

  • Often combined with IN, EXISTS, LIKE, etc.
    For example:
    WHERE NOT IN (...), WHERE NOT LIKE 'A%', etc.


Need examples with NOT combined with other operators?

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