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28 Φεβ 2009 · DROP PROCEDURE IF EXISTS databaseName.drop_user_if_exists ; DELIMITER $$ CREATE PROCEDURE databaseName.drop_user_if_exists() BEGIN DECLARE foo BIGINT DEFAULT 0 ; SELECT COUNT(*) INTO foo FROM mysql.user WHERE User = 'test' and Host = 'localhost'; IF foo > 0 THEN DROP USER 'test'@'localhost' ; END IF; END ;$$ DELIMITER ; CALL databaseName.drop ...
The IF EXISTS option allows you to conditionally drop a stored function if it exists. It prevents an error from arising if the function does not exist. MySQL DROP FUNCTION example. We’ll use the orders table in the sample database for the demonstration:
In MySQL 5.7.8+, you can use the IF EXISTS clause to conditionally drop a user only if it exists: DROP USER [IF EXISTS] account_name [,account_name2]...; Code language: SQL (Structured Query Language) (sql) Besides removing the user account, the DROP USER statement also removes all privileges of the user from all grant tables. MySQL DROP USER ...
15.1.29 DROP PROCEDURE and DROP FUNCTION Statements. DROP {PROCEDURE | FUNCTION} [IF EXISTS] sp_name. These statements are used to drop a stored routine (a stored procedure or function). That is, the specified routine is removed from the server.
DROP USER [IF EXISTS] user [, user] ... The DROP USER statement removes one or more MySQL accounts and their privileges. It removes privilege rows for the account from all grant tables.
3 Ιαν 2023 · Basic Usage of the EXISTS Operator in MySQL. The EXISTS condition in MySQL is generally used along with a subquery that consists of a condition to be met. If this condition is met, then the subquery returns a minimum of one row. This method can be used to DELETE, SELECT, INSERT, or UPDATE a statement.
7 Μαΐ 2021 · Another technique that will work for MySQL is DROP USER IF EXISTS followed by CREATE USER. The more thorough solution for consistency is to be strictly on how replicas are created and don't update replicas except through replication.
