Translation: SET Variable (submitted to MARIADB official manual)

This is the Official Handbook for MARIADB: The translation of SET variable.

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

Grammar

SET var_name = expr [, var_name = expr] ...

The statements in the stored program stored programs SET are an extended function of the normal SET statement. Variable reference, you can refer to the stored program internal, global system variables, or user-defined variables.

The statements in the stored program SET are implemented as part of the existing SET syntax. This allows extended SET a = x,b = y,... syntax, where you can mix different variable types (locally declared variables, global system variables, and session system variables, user-defined variables). Also allows the combination of local variables and some options that make sense only for system variables; In this case, although the option is recognized, it is ignored.

SETYou can assign values to local variables locally variables and user-defined variables user-defined variables .

When you assign values to multiple variables by using the column values returned by the query, you should prioritize using SELECTinto.

When assigning the same value to multiple variables, you can use the function last_value ().

The following is an example of an assignment of a user-defined variable:

 SET @x = 1;Example of a translator supplement: set assigns values to multiple types of variables, noting that when one of the variables fails, the entire statement fails set @x = 1, SESSION sql_mode = " ; SET GLOBAL sort_buffer_size = 1000000, SESSION sort_buffer_size =  1000000;  SET @@ Global sort_buffer_size = 1000000, @@ Global. Sort_buffer_size = 1000000; SET GLOBAL max_connections = sort_buffer_size = 1000000;

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Translation: SET Variable (submitted to MARIADB official manual)