Αποτελέσματα Αναζήτησης
9 Ιουν 2011 · delete from YourTable where YourTable.columnA in (select columnA from YourTable group by column A having count(*) > 1)
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.
4 Απρ 2021 · DELETE t1 FROM data t1 JOIN data t2 USING (channel_id,timestamp) WHERE t1.id > t2.id
DELETE FROM words WHERE id IN (SELECT * FROM (SELECT id FROM words GROUP BY `char` HAVING COUNT(`char`) > 2) AS w); Additional 'SELECT ... AS w' is needed to bypass mysql restriction for those kind of queries.
The DELETE statement deletes rows from tbl_name and returns the number of deleted rows. To check the number of deleted rows, call the ROW_COUNT() function described in Section 14.15, “Information Functions”. Main Clauses. The conditions in the optional WHERE clause identify which rows to delete.
13 Μαΐ 2016 · I need to cleanup my table of over 14.000.000 rows inside. I want to delete all entries, that are older than 30 days, but only if number of grouped items is larger than one. So, at least one item will stay. Getting items and deleting them by date is not that problem. But it will delete all.
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.
