Summary: in this tutorial, we will show you how to delete data from multiple tables by using MySQL DELETE JOIN statement.. I've try to make a nested query to delete my rows on many tables and got the following message: I've understand that Oracle can delete rows in mulTIple tables only if he sees it as a single table. I think what the Oracle DBA was trying to say is you cannot delete records from two tables in the manner you are attempting. That will allow one delete statement to delete rows from parent and child tables. If you omit the WHERE clause, the statement will remove all rows in the table. Syntax Parameters. So in that case a single delete query of master table can delete master tables data as well as child tables data. Because of the ON DELETE CASCADE option, Oracle7 cascades any deletion of a DEPTNO value in the DEPT table to the DEPTNO values of its dependent rows of the EMP table. MuraliDharan V. October 09, 2008 06:28AM ... Oracle Corporation and/or its affiliates Products; Oracle … You can specify multiple tables in a DELETE statement to delete rows from one or more tables depending on the particular condition in the WHERE clause. In the previous tutorial, you learned how to delete rows of multiple tables by using: A single DELETE statement on multiple tables. There are many ways to oracle delete duplicate rows but keep original .I would be showing off few faster method to achieve it in this post. It is better to construct a single statement that removes all unwanted copies in one go. Posted by: MuraliDharan V Date: October 09, 2008 06:28AM ... Delete records from multiple tables in a single query. If your aim is only delete rows from table1, you can re-write your query as follow: DELETE FROM table1 p WHERE EXISTS( SELECT 'MYROW' FROM table2 e JOIN table3 d ON d.col4 = 'IO' AND d.col5 = -1 AND e.col3 = d.col6 WHERE e.col1 = 'YU' AND e.username = p.username AND p.col2 = d.col3 ); This process will delete 1,5 millons.My first approach was create a SP with this lines: SET TRANSACTION USE ROLLBACK SEGMENT Rbig; DELETE FROM CTDNOV WHERE CTDEVT IN (4,15); (1,5m rows) COMMIT;Then I submited a job t ... DELETE statement is used to remove or delete a single record or multiple records from a table. Example: To remove rows from the table 'agent1' with following conditions - 1. If a table has a few duplicate rows, you could do this manually one by one by using a simple DELETE statement. Read about referential integrity and cascade delete. To remove one or more rows in a table: First, you specify the table name where you want to remove data in the DELETE FROM clause. 'da' and 'cu' are the aliases of 'agent1' and 'customer' table, Oracle Delete Query for beginners and professionals with examples on insert, select, update, delete, table, view, join, key, functions, procedures, indexes, cursor etc. Second, you put a condition in the WHERE clause to specify which rows to remove. Now when u delete a record from the master table all other details table record based on the deleting rows primary key value, will be deleted automatically. For example, if department 20 is deleted from the DEPT table, Oracle7 deletes the department's employees from the EMP table. The table_references clause lists the tables involved in the join. Delete records from multiple tables in a single query. SQL delete records using subqueries with alias and IN . However, it is time-consuming to do it manually if the table has a large number of duplicate records. Deleting many rows from a big table Tom: We have a 6 millons rows table and we need to clean it. 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