MySQL NOT operator
NOT operator
MySQL NOT operator reverses or negates the input.
This function is useful in -
- If you want to retrieve all records except those that meet a specific condition, NOT is invaluable.
- It allows you to negate the result of a condition.
- NOT makes queries more explicit. It clearly states that you want the opposite of a certain condition, which can help prevent misunderstandings or misinterpretations of your query.
- When you have complex conditions involving multiple logical operators like AND and OR, NOT can be crucial for achieving the desired outcome.
- NOT can be used to invert the logical meaning of a condition.
- In some scenarios, NOT can be used to conditionally insert or update records based on the absence of a specific condition.
- By using NOT judiciously, you can optimize your queries to efficiently retrieve the desired data.
Syntax:
NOT, !
The operator returns 1 if the operand is 0 and returns 0 if the operand is nonzero. It returns NULL if the operand is NOT NULL.
MySQL Version: 8.0
Example: MySQL NOT operator
In the following MySQL statement, NOT operator negates the input 10, it returns 0.
Code:
SELECT ! 10;
Output:
Example of MySQL NOT operator with zero input
In the following MySQL statement, NOT operator negates the input 0, it returns 1.
Code:
SELECT ! 0;
Output:
MySQL> SELECT ! 10; +------+ | ! 10 | +------+ | 0 | +------+ 1 row in set (0.00 sec)
Example of MySQL NOT operator with zero input
In the following MySQL statement, NOT operator negates the input 0, it returns 1.
Output:
MySQL> SELECT ! 0; +-----+ | ! 0 | +-----+ | 1 | +-----+ 1 row in set (0.00 sec)
Example of MySQL NOT operator with NULL
In the following MySQL statement, NOT operator negates the input NULL, it returns NULL.
Code:
SELECT ! NULL;
Output:
MySQL> SELECT ! NULL; +--------+ | ! NULL | +--------+ | NULL | +--------+ 1 row in set (0.00 sec)
Example of MySQL NOT operator with non-zero input
In the following MySQL statement, NOT operator negates the input (10+10), it returns 0.
Code:
SELECT ! (10+10);
Output:
MySQL> SELECT ! (10+10); +-----------+ | ! (10+10) | +-----------+ | 0 | +-----------+ 1 row in set (0.00 sec)
Previous: AND operator
Next: OR operator
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