PostgreSQL Documentation 16 DELETE
Description DELETE deletes rows that satisfy the WHERE clause from the specified table If the WHERE clause is absent the effect is to delete all rows in the table The result is a valid but empty table Tip TRUNCATE provides a faster mechanism to remove all rows from a table
Delete all but top n from database table in SQL Stack Overflow, Just a note that you can solve the subquery performance issue via either creating a temporary table manually assuming this is an infrequent operation or writing the query as DELETE FROM Table WHERE ID NOT IN SELECT id FROM SELECT TOP 10 ID FROM Table AS x to force MySQL to create a temporary table Michael Mior Jul 19 2011 at 16 46 1
Most efficient way of bulk deleting rows from postgres
Execute a DELETE query for each row in the file with a simple WHERE on primary key or group the deletes in batches of n using an IN clause Import the primary keys into a temporary table using the COPY command and then deleting from the main table using a join Any suggestions will be much appreciated bulk Share Improve this ion Follow
How to delete all rows from table except 6 given known uuids with , Sql How to delete all rows from table except 6 given known uuids with PostgreSQL Stack Overflow How to delete all rows from table except 6 given known uuids with PostgreSQL Ask ion Viewed 478 times 1 I want to clean a table and only keep 6 rows targeted with uuids
Postgresql SQL remove all except the last N rows by group Stack
Postgresql SQL remove all except the last N rows by group Stack , 1 Answer Sorted by 3 You could use a subquery here DELETE FROM messages m1 WHERE id NOT IN SELECT m2 id FROM messages m2 WHERE m2 client id m1 client id ORDER BY m2 id DESC LIMIT 5 The above logic would prune away all client records which are not the most recent five
Eliminar Todas Las Filas De La Tabla En PostgreSQL Delft Stack
Sql How to DELETE all data in a table except for rows with specifc
Sql How to DELETE all data in a table except for rows with specifc If the column could have NULL values you will want those deleted too So a better construct is DELETE FROM schema table WHERE column description specific word Or if the pattern could be part of the description use NOT LIKE DELETE FROM schema table WHERE column description NOT LIKE specific word Share Improve this answer Follow
Delete All Rows Except The Header In 365 Excel ions Answers Make Community
17 Answers Sorted by 158 You cannot delete the records that way the main issue being that you cannot use a subquery to specify the value of a LIMIT clause This works tested in MySQL 5 0 67 DELETE FROM table WHERE id NOT IN SELECT id FROM SELECT id FROM table ORDER BY id DESC LIMIT 42 keep this many records foo SQL query Delete all records from the table except latest N . The asterisk allows you to return all columns of the deleted row from the table name To return specific columns you specify them after the RETURNING keyword Note that the DELETE statement only removes data from a table It doesn t modify the structure of the table You use the DELETE command to remove rows the syntax is very similar to the UPDATE command For instance to remove all rows from the products table that have a price of 10 use DELETE FROM products WHERE price 10 If you simply write DELETE FROM products then all rows in the table will be deleted Caveat programmer Submit correction
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