What is the usage of “begin end” in MySQL?

5 months ago

1 minute

In MySQL, BEGIN and END are mainly used to define a code block that can be used in stored procedures, functions, or triggers. The code block contains a series of SQL statements that can control the execution flow of those statements.

The specific usage is as follows:

Using BEGIN and END in stored procedures.

DELIMITER //
CREATE PROCEDURE myProcedure()
BEGIN
   SELECT * FROM myTable;
END //
DELIMITER ;

Use BEGIN and END in a function.

DELIMITER //
CREATE FUNCTION myFunction() RETURNS INT
BEGIN
   DECLARE result INT;
   SET result = (SELECT COUNT(*) FROM myTable);
   RETURN result;
END //
DELIMITER ;

Using BEGIN and END in triggers.

DELIMITER //
CREATE TRIGGER myTrigger BEFORE INSERT ON myTable
FOR EACH ROW
BEGIN
   SET NEW.created_at = NOW();
END //
DELIMITER ;

In the given example, BEGIN and END are used to mark the beginning and end of a code block, where a series of SQL statements can be included to achieve complex logic control or data processing operations.