How to define and call stored procedures and functions in MySQL.

The syntax for defining stored procedures and functions in MySQL is as follows:

1. Definition of a stored procedure:

DELIMITER //
CREATE PROCEDURE procedure_name()
BEGIN
    -- 存储过程逻辑
END //
DELIMITER ;

1. Define a function:

DELIMITER //
CREATE FUNCTION function_name()
RETURNS data_type
BEGIN
    -- 函数逻辑
END //
DELIMITER ;

Once the definition is complete, you can call the stored procedure and functions using the following method:

1. Invoke a stored procedure:

CALL procedure_name();

1. Call the function:

SELECT function_name();

It is important to note that in MySQL, the parameters and return value types of stored procedures and functions need to be defined based on the specific situation. Stored procedures and functions can help simplify complex data processing logic and improve database operation efficiency.