The difference between and and or in mysql-Mysql Knowledge-php.cn

The difference between and and or in mysql

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Release： 2024-04-27 07:42:27

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AND and OR in MySQL are logical operators used to combine conditional expressions. AND requires all conditions to be true, OR requires at least one condition to be true.

The difference between and and or in mysql

The difference between AND and OR in MySQL

Get straight to the point:

MySQL AND and OR are two logical operators used to combine multiple conditional expressions.

Detailed expansion:

AND operator

Connects two or more conditions together, The entire expression is true only if all conditions are true.
If any one of the conditions is false, the entire expression is also false.
Syntax: condition1 AND condition2 AND ...

OR operator

Two or more conditions are connected together. As long as one of the conditions is true, the entire expression is true.
If all conditions are false, the entire expression is also false.
Grammar: condition1 OR condition2 OR ...

Difference

##Conditional relationshipAll conditions are metAt least one condition is metTruth table##condition1truetruefalsefalse

Features	AND	OR


condition2	Result
true	true
false	false
true	true
false	false

Usage example

AND operator:

<code class="mysql">SELECT * FROM employees
WHERE salary > 50000
AND department = 'Sales';</code>

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This will select all sales department employees with a salary greater than $50,000.

OR Operator:

<code class="mysql">SELECT * FROM employees
WHERE job_title = 'Manager'
OR department = 'Engineering';</code>

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This will select all employees who have a manager position or are part of the engineering department.

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