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9 Ιουν 2011 · delete from YourTable where YourTable.columnA in (select columnA from YourTable group by column A having count(*) > 1)
16 Απρ 2024 · Deleting a MySQL user removes the user's account and the associated grant table privileges. Only admins with global CREATE USER or DELETE privileges can remove another user from MySQL. In this tutorial, learn how to remove one or more MySQL user accounts using the DROP USER statement.
The GROUP BY statement groups rows that have the same values into summary rows, like "find the number of customers in each country". The GROUP BY statement is often used with aggregate functions (COUNT(), MAX(), MIN(), SUM(), AVG()) to group the result-set by one or more columns.
To remove a user account from the MySQL Server, you use the DROP USER statement as follows: DROP USER account_name; Code language: SQL (Structured Query Language) (sql) In this syntax, you specify the name of the user account that you want to remove after the DROP USER keywords.
4 Απρ 2021 · DELETE t1 FROM data t1 JOIN data t2 USING (channel_id,timestamp) WHERE t1.id > t2.id
The DROP USER statement removes one or more MySQL accounts and their privileges. It removes privilege rows for the account from all grant tables. Roles named in the mandatory_roles system variable value cannot be dropped. To use DROP USER, you must have the global CREATE USER privilege, or the DELETE privilege for the mysql system schema.
You must have the global CREATE USER privilege or the DELETE privilege for the mysql system database to use the DROP USER statement. The DROP USER statement also removes the user's privileges and deletes the account's rows from the user table in the mysql system database.
