SO-43364653, MySQL

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#MySQL 5.7.12
#please drop objects you've created at the end of the script 
#or check for their existance before creating
#'\\' is a delimiter

DROP PROCEDURE IF EXISTS `deleteUser`;
DROP TABLE IF EXISTS `Table3`, `Table2`, `Table1`;

CREATE TABLE IF NOT EXISTS `Table1` (
    `id` INT
);

CREATE TABLE IF NOT EXISTS `Table2` (
    `user_id` INT
);

CREATE TABLE IF NOT EXISTS `Table3` (
    `userid` INT
);

INSERT INTO `Table1` VALUES (100), (200), (300), (400);
INSERT INTO `Table2` VALUES (100), (600), (700), (800);
INSERT INTO `Table3` VALUES (100), (900), (1000), (1100);

SELECT `id` FROM `Table1`;
SELECT `user_id` FROM `Table2`;
SELECT `userid` FROM `Table3`;

CREATE PROCEDURE `deleteUser`(IN `_userid` INT)
BEGIN
    DELETE FROM `Table1` WHERE `id` = `_userid`;
    DELETE FROM `Table2` WHERE `user_id` = `_userid`;
    DELETE FROM `Table3` WHERE `userid` = `_userid`;
END\\

CALL `deleteUser`(100);

SELECT `id` FROM `Table1`;
SELECT `user_id` FROM `Table2`;
SELECT `userid` FROM `Table3`;

DROP TABLE IF EXISTS `Table3`, `Table2`, `Table1`;
DROP PROCEDURE IF EXISTS `deleteUser`;


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