Translation: assignment operator (: =) (submitted to MARIADB official manual)

This document is the official manual of Mariadb: The translation of the assignment operator (: =).

Original:https://mariadb.com/kb/en/assignment-operator/
I submit it to MARIADB official manual:https://mariadb.com/kb/zh-cn/assignment-operator/

Grammar

var_name := expr

Describe

The assignment operator is used to assign a value to a variable. The value to the right of the operator is assigned to the variable to the left of the operator.

Unlike the = operator, the = operator can always be used to assign a value to a variable. (Translator Note: You cannot use "=" To assign a value when using a SELECT statement).

The operator can assign a value to the user-defined variable user-defined variables and local variables locally variables .

You can consider using the last_value () function when you want to assign values of the same value to multiple variables.

Example

SELECT @x := 10;+----------+| @x := 10 |+----------+|       10 |+----------+SELECT @x, @y := @x;+------+----------+| @x   | @y := @x |+------+----------+|   10 |       10 |+------+----------+

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Translation: assignment operator (: =) (submitted to MARIADB official manual)