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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 · Delete a MySQL user using the DROP USER statement. This tutorial explains the statement syntax and gives examples for removing unwanted users.
DELETE Syntax. DELETE FROM table_name WHERE condition; Note: Be careful when deleting records in a table! Notice the. WHERE clause in the DELETE statement. The WHERE clause specifies which record (s) should be deleted. If you omit the WHERE clause, all records in the table will be deleted!
12 Απρ 2024 · You can specify multiple users, separated by commas, to delete them in a single DROP USER statement. For example, to delete a user named “john,” the DROP USER query would be: DROP USER john; By using the DROP USER statement with or without the IF EXISTS clause, you can efficiently remove MySQL user accounts from the server.
For example, the following statement finds rows matching the WHERE clause, sorts them by timestamp_column, and deletes the first (oldest) one: DELETE FROM somelog WHERE user = 'jcole' ORDER BY timestamp_column LIMIT 1; ORDER BY also helps to delete rows in an order required to avoid referential integrity violations.
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 · My ultimate goal is to add a unique index which fails due to the duplicates. The duplicates are: select channel_id,timestamp,count(*) cnt. from data. group by channel_id,timestamp having cnt>1.
