In the database structured query language (SQL), the DELETE statement removes one or more records from a table.

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Delete all highscores from a certain country

I have two tables: tbl_players tbl_highscores I need to delete all highscores that are registered from a certain country. My problem is that the language are set per player, rather than by ...
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How do I Delete A Database And Log Files With SQL 2008 Script?

While working on making an automated Delete and Restore script for my backups I ran into a snag. I can not delete the database; however, the delete button works exactly how I need it to. Can anyone ...
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Inserting data to a table which is being cleaned up by SQL job at the same time

Our app uses a table in a database and we have a Sql job set up to run overnight which executes a stored procedure which just deletes data older that from the table. DELETE FROM MyTable ...
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Delete rows in a table that has multiple FKs

I need to delete all the rows in the ContentData table that have the word 'DV95' in the htmldata column. Here is what I am using: BEGIN TRANSACTION DELETE Contentdata FROM Contentlinks INNER JOIN ...
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MySQL Query: Delete from 'table2' where column = 'value' IF column in 'table1' = 'value'

I am trying to execute a MySQL query to delete rows from 'table2' where column = 'value' IF column in 'table1' = 'value' I have 2 tables... Table 1 is called accounts Table 2 is called ...
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1answer
58 views

Single statement or batched delete?

I need to delete 6.3 million records from 25 tables in production. I have the following two queries, but I don't know which one will be best: delete jc from Jtable jc join J1Table j on j.JobId = ...
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1answer
349 views

Deleting 200M+ rows from InnoDB table

Basically, we have a table with the following structure: CREATE TABLE `reqs` ( `id` INT(10) NOT NULL AUTO_INCREMENT, `reqid` BIGINT(20) NOT NULL, `from` BIGINT(20) NOT NULL, `to` ...
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4answers
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Delete the N oldest entries grouped by multiple columns

I´d like to delete the oldest entries of my database, but in each category shall remain at least N words of each char. Structure of TABLE words id | word | char | category For example I have the ...
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1answer
444 views

Will deleting data in master automatically delete data in slave?

I have data replication setup on MySQL. If I delete data on the master, will replication know data was deleted and automatically delete the same data on slave?
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1answer
656 views

Postgresql revert back database value

I have postgresql database. My table name is tblvoippolicy. Now, problem is by mistake i have deleted some records from table. When I get the data file using following commands. select * from ...
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1answer
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How is it possible that two deletes give a deadlock, if they do have different primary key data

I am getting a deadlock by the same delete stored procedures that is called by two different threads for deleting two concurrent records. The deadlock happened on the primary key index of the X ...
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3answers
421 views

Bulk Delete for Large Table in MySQL

I have a Notification table contains about 100 million rows host in Amazon RDS with 1000 IOPS, and I want to delete those rows older than one month. If I do DELETE FROM NOTIFICATION WHERE CreatedAt ...
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1answer
612 views

Error deleting more than 1 row

I have a stored procedure that is supposed to delete several rows from a table. It does not work and gives me the error: The transaction ended in the trigger. The batch has been aborted I tried ...
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1answer
942 views

Inherit audit columns and triggers

Background I have a database with dozens of tables, some of which should have audit columns. Problem I'd like to avoid the drudgery of creating audit columns manually, and write the update and ...
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1answer
211 views

clustered and covering index ignored on delete statement. Table scan occurs

Why would SQL Server 2005 find it more efficient to perform a table scan instead of using the available clustered index on the primary key (and only the primary key)? DISCLAIMER: There is also a ...
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2answers
5k views

remove duplicate rows in mysql table that does not contain primary key

I have a table item having just one column name:- name ----- toys shirt mobile Shirt speaker Toys .... .... I am trying to delete duplicate rows except one duplicated record with the help of below ...
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2answers
154 views

How can I delete repeated rows?

I have a system that gathers RSS from many sites including UTF-8 based sites (non-english sites). I have tried to avoid repeated rows but I have repeats in my table. RSS_items (id(auto_increment) ...
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0answers
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speed up ghost cleanup

In SQL Server I have a table that is filled often and also gets deleted often. Because several threads write and erase data from that table I cannot even truncate it because there is always someone ...
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1answer
302 views

Postgres 9.3 - deletes terribly slow for 10 minutes after dropping indexes/constraints

If I run a script which drops indexes (17 of them, CONCURRENTLY makes no difference except that without it I get the occasional deadlock), then constraints (20 constraints on 18 tables) and then run a ...
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1answer
92 views

What is the equivalent of a “Certificate of Destruction” when using a cloud-hosted database?

We have a Rails application hosted by Heroku and using an Heroku Postgres database. Some of the information we store is considered to be sensitive by our users, and we've been asked if we can provide ...
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4answers
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MySQL: Keep the 10 most recent rows for each user

I have a table saving scores for a game that have 3 columns (more in practice, but it is easier for everyone this way): userid : the id of the user that got the score timestamp: the time the score ...
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3answers
396 views

Deleting data from a large table with replication

I need to delete all the rows from a given table. The table contains millions or records. The master database is being replicated to several slaves and I wish to do that without creating a replication ...
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2answers
909 views

How to delete rows from a table when we're joining and return data?

I have two queries: The first one is as below: SELECT * FROM batch bp INNER JOIN sender_log sl ON sl.id=bp.log_id AND bp.protocol='someprotocol' The second query is used to delete rows: ...
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MySQL: Delete all but last N records

Consider the following table: mysql> DESCRIBE pixels; +---------------+-------------+------+-----+-------------------+----------------+ | Field | Type | Null | Key | Default ...
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Full table scan - high water mark

When doing a full-table scan, why does Oracle scan all the rows beneath the high-water mark? Doesn't it know that some of the rows have been deleted and that they shouldn't be scanned?
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Do I need to reindex mysql table after bulk delete?

I have a table in MySQL with a lot of INSERT and SELECT at every second. And there is a bulk delete of some older data once in a day. Do I need to reindex the table after delete? I want to increase ...
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Unable to delete a record in Mysql

Let's say I have table name Company with two columns cname, location. In the table I am having two records with cname |location Asmetric |Dallas Sophore |Washington on this table when I ...
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SQL Server : trigger FOR DELETE

I want to create a trigger, which does not delete a customer if his name is Peter. How can I do that? CREATE TRIGGER trgCUSTOMER ON customer FOR DELETE AS BEGIN IF (SELECT name FROM deleted) not ...
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Delete from table where two of the three keys in another select

I have tableA which has 4 columns: IDA (bigint), IDB (int), IDC (varchar(255)) and comment (varchar(255)). The primary key is (IDA, IDB, IDC). I'm required to delete the records where the count of ...
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Approaches for deleting unnecessary records from tables

We have a database which stores the temperatures of 20 thermometer every 7 seconds. We want to delete all records in the way that every minute holds just one tempereature instead of 8 which are older ...
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3answers
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SQL Delete rows where a dataname will equal mulitple variables

Researching similar common queries have really helped but I am still none the wiser as to my issue. To note that the database I intend to use this on contains around 1000 rows (same 2 columns listed ...
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2answers
984 views

How to avoid locks by large transactions?

We have a large application running, that requires cleanup for performance reasons. This was however not forseen when designing the application. Basically, the delete is executed from a stored ...
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1answer
817 views

MySQL: update instead of delete if foreign key constraint?

I have a bit of a strange question. I know about insert on duplicate key update. My question is, is there something similar for deletes that fail because of foreign key constraints? For example: ...
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Freeing space after deleting rows [duplicate]

I have a SQL Server 2008 instance and one table is quite large (log data) so I delete old logs. Now I start to read articles on this problem, here is one. As I see it there is no solution! If I ...
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1answer
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Delete from table where multiple fields match select subquery from other table

I want to delete an entry in a table where multiple fields match the results of another select subquery which takes data from another table. This is what I have so far, though it doesn't work: ...
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1answer
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MySQL Deadlock - accessing different primary key values also creating deadlock

I went through MySQL logs and found the reason for deadlock 1st thread is trying to execute below query. Which is waiting for thread 2. UPDATE M_SAMP SET MM_Q_IND=0 WHERE M_ID IN (SELECT M_ID FROM ...
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1answer
630 views

Remove all records with duplicates in db2. (Not just the duplicate records)

How can I remove all the records with duplicates in db2. I have looked at various answers but they only remove the duplicates leaving one record from that set in the table. This is what I found ...
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1answer
604 views

Large table delete in mysql

I want to delete a table with 10,000,000 records. Due to some restrictions I can't do truncate on that table (I don't have the DROP privilege), I can think of two options: DELETE QUICK To set some ...
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1answer
580 views

Delete entry from related tables

I can not use InnoDB engine because of some dependency troubles in LuaSQL and PtokaX. My current query is something like: DELETE e.*, m.* FROM entries e INNER JOIN magnets m ON m.eid = ...
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2answers
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Fastest way to delete matching rows in MySQL?

I have more than 10 million records in a table. I want to delete the records where the email column contains .ac.. What is the fastest method to perform the task? Table Schema CREATE TABLE `master` ...
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1answer
173 views

Mysql setting a record as deleted or archive

Is there any way to omit some records in mysql select statement and not deleting them? We can easily add a column for example deleted and set it to 1 for deleted ones and keep them but the problem is ...
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1answer
833 views

Delete by primary key takes too long

What would make a query that deletes a row using the primary key of the table .. take too long ? This is a table with about 1.4M rows that gets .. 70%/30% read/write . I don't know where to look. ...
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MySQL - automatically update all references to specific table to use on delete cascade?

I have a specific table for one of my software packages on a MySQL 5.1 box which I need to drop a few hundred entries. These are user names with names in uppercase, the application is case specific ...
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758 views

Deny insert/delete for all users in SQL Server 2005

In our database we have about 20 users, that is used be some program (and users are added with this program). Now there was new requirement to use 2 database and do not allow delete data from one ...
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1answer
71 views

Delete Duplicates Leaving One of Two Identical Records [closed]

Delete Duplicates Leaving One of Two Identical Records One of my MySQL database tables contains four BLObs in each row. When it was first set up the table had no keys. However when I now try to add a ...
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2answers
158 views

DELETE seems to hang

The following command: DELETE FROM hours WHERE id IN (SELECT id FROM holdkey WHERE persons_id=60) seems to hang indefinitely. However, the corresponding SELECT * command completes in a fraction of ...
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1answer
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MySQL master master replication, safe to delete rows on both masters?

We have a MySQL (v5.1.61) cluster with two masters (and two slaves). We have a table logs with a primary key column logID. This log table grows rather huge, and we'd like to delete data from it. So ...
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mysqldump: replace drop table in output with delete?

I am using mysqldump to dump some records in a table: mysqldump mydatabase mytable --where="field=value" this emits script that includes drop table mytable statement. Since I use the --where ...
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512 views

mysql query - how to delete duplicates based on highest int?

I'm running a reverse auction website and I need to delete the duplicate bids and keep only the highest amount . lastPriceBid_rounded is the "amount". The duplicate is defined by the userId. ...
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271 views

Delete word, its meanings, its meaning's example sentences from DB

I have three tables as below (simplified for demonstration): words ===== integer id text word meanings ======== integer id integer word_id text meaning examples ======== integer id integer ...