What does it represent in mysql?

The AND operator is used to connect multiple conditions, and the result is true only when all conditions are met. Syntax: condition 1 AND condition 2 ... [AND condition n]. Usage includes: combining search conditions, filtering complex data, and creating subquery conditions. NOTE: Has higher precedence than the OR operator, and the result is always false when null is used with true or false.

The "AND" operator in MySQL

The role of the AND operator

The AND operator is used to join two or more conditions together, and the result is true only if all conditions are met.

Syntax

Condition 1 AND condition 2 ... [AND condition n]

Example

Suppose we have a table named users, دارای ستون های id, name and age. To select all users who are older than 20 and whose name starts with "J", we can use the following query:

<code class="sql">SELECT *
FROM users
WHERE age > 20 AND name LIKE 'J%';</code>

Usage

AND operator is usually used for:

• Combine multiple search conditions together
• Filter out data that meets specific complex conditions
• Create more complex conditions in subqueries

Note

• The operator has higher priority than the OR operator
• You can use parentheses to change the execution order of the operators
• Null values ​​do not affect the result of the AND operator; that is, when a null value is used with true or false, the result is always false

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