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Dec 17, 2010 · FROM (SELECT id. FROM tableE. WHERE arg = 1 AND foo = 'bar') x); will work just fine: Query OK, 1 row affected (3.91 sec) Wrap your subquery up in an additional subquery (here named x) and MySQL will happily do what you ask.
Mar 17, 2009 · Since you are selecting multiple tables, The table to delete from is no longer unambiguous. You need to select: DELETE posts FROM posts. INNER JOIN projects ON projects.project_id = posts.project_id. WHERE projects.client_id = :client_id. In this case, table_name1 and table_name2 are the same table, so this will work: DELETE projects FROM posts ...
Mar 1, 2010 · If you configure binary logging on MySQL, you can rollback the database to any previous point you still have a snapshot and binlog for. 7.5 Point-in-Time (Incremental) Recovery Using the Binary Log is a good starting point for learning about this facility.
May 25, 2017 · I had a use case of deleting 1M+ rows in the 25M+ rows Table in the MySQL. Tried different approaches like batch deletes (described above). I've found out that the fastest way (copy of required records to new table): Create Temporary Table that holds just ids. CREATE TABLE id_temp_table ( temp_id int);
Dec 30, 2010 · However, you can either SELECT then DELETE in separate queries, or nest another subquery and alias the inner subquery result (looks rather hacky, though): SELECT * FROM (. SELECT id FROM posts GROUP BY id HAVING ( COUNT(id) > 1 ) ) AS p. Or use joins as suggested by Mchl. I had a table with 150 duplicate keys.
Jun 11, 2018 · This appears to be a published bug in MySQL 8.x. From this bug report: In the 2015 version of the SQL standard, a CTE cannot be defined in UPDATE; MySQL allows it but makes the CTE read-only (we're updating the documentation now to mention this). This said, one could use a view instead of the CTE; then the view may be updatable, but due to the ...
Jun 13, 2014 · 1. I believe the simplest approach when attempting to use negative logic is to write the inverse and then prefix with not. Identify the records of concern and then do not delete them, something like this. DELETE FROM inscriptions. WHERE not ( (agent_inscripteur_1 = 100520 OR agent_inscripteur_2 = 100520)
Jul 9, 2013 · Your second DELETE query was nearly correct. Just be sure to put the table name (or an alias) between DELETE and FROM to specify which table you are deleting from. This is simpler than using a nested SELECT statement like in the other answers. Corrected Query (option 1: using full table name):
Aug 4, 2017 · You don't indicate what kind of DB you are running against (innoDB or MyISAM, etc) but if you are running against InnoDB, you need to have a commit() statement to commit the transaction after your executeUpdate(). Chances are you have something in your log that indicates that your transaction has been rolled back.
Use row_count - your_desired_offset. So if we had 10 rows and want to offset 3. 10 - 3 = 7 Now the query delete from table where this = that order asc limit 7 keeps the last 3, and order desc to keep the first 3:
