How do I delete a fixed number of rows with sorting in PostgreSQL
2 Assuming you want to delete ANY 10 records without the ordering you could do this DELETE FROM logtable as t1 WHERE t1 ctid select t2 ctid from logtable as t2 where Select count from logtable t3 where t3 ctid t2 ctid 10 LIMIT 1 For my use case deleting 10M records this turned out to be faster
Most efficient way of bulk deleting rows from postgres, I m wondering what the most efficient way would be to delete large numbers of rows from PostgreSQL this process would be part of a recurring task every day to bulk import data a delta of insertions deletions into a table
PostgreSQL Documentation 16 DELETE
PostgreSQL lets you reference columns of other tables in the WHERE condition by specifying the other tables in the USING clause For example to delete all films produced by a given producer one can do DELETE FROM films USING producers WHERE producer id producers id AND producers name foo What is essentially happening here is a join
Simulating UPDATE or DELETE with LIMIT in Postgres CTEs to The Rescue , Using this approach we can often structure our DELETE or UPDATE query to first use a SELECT to define the affected rows then perform the underlying operation in ion on this basically looking something like this general recipe WITH rows AS SELECT something FROM big table LIMIT 10 DELETE FROM big table WHERE something IN SELECT
PostgreSQL Documentation 16 7 6 LIMIT and OFFSET
PostgreSQL Documentation 16 7 6 LIMIT and OFFSET, LIMIT and OFFSET LIMIT and OFFSET allow you to retrieve just a portion of the rows that are generated by the rest of the query SELECT select list FROM table expression ORDER BY LIMIT number ALL OFFSET number If a limit count is given no more than that many rows will be returned but possibly fewer if the query itself
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How to Use LIMIT in Postgres Delete in two roundabout ways
How to Use LIMIT in Postgres Delete in two roundabout ways One way to delete a limited number of rows in Postgres is by combining the DELETE statement with a WHERE condition that uses the IN clause along with a subquery Here s how you can delete only 1 row for user id 2 similar to the above MySQL exmaple DELETE FROM quote WHERE id IN SELECT id FROM quote WHERE author id 2 LIMIT 1 In this
How To Use Postgres DELETE CASCADE
In PostgreSQL use the DELETE statement to delete one or more rows in the table It only deletes the data from the table and not the table structure Syntax Delete Statement DELETE FROM table name WHERE condition RETURNING output expression AS output name PostgreSQL Delete Data in a Table TutorialsTeacher. 3 Using PostgreSQL DELETE to delete multiple rows from the table The following statement deletes two rows from the links table and return the values in the id column of deleted rows DELETE FROM links WHERE id IN 6 5 RETURNING Code language SQL Structured Query Language sql Output 4 Using PostgreSQL DELETE to delete all rows from the table Here are some strategies to efficiently delete millions of rows in PostgreSQL Use DELETE with LIMIT Instead of deleting all rows at once use the DELETE statement with a LIMIT clause to delete a specific number of rows in each iteration This helps to control the transaction size and minimize the impact on the database
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