Mysql delete all row

If you omit the WHERE clause, the DELETE statement will delete all rows in the table. Besides deleting data from a table, the DELETE statement returns the number of rows deleted. To delete data from multiple tables using a single DELETE statement, you use the DELETE JOIN statement which we will cover in the next tutorial. It is possible to delete all rows in a table without deleting the table. How to delete a certain row from mysql table with same column values?

Ask Question Asked years, months ago. Delete a row from MySql. TRUNCATE TABLE table_name. Therefore, use the latter. Just to make sure that you delete only one row , append the query with LIMIT 1. If you delete the row containing the maximum value for an AUTO_INCREMENT column, the value is not reused for a MyISAM or InnoDB table.

If you delete all rows in the table with DELETE FROM tbl_name (without a WHERE clause) in autocommit mode, the sequence starts over for all storage engines except InnoDB and MyISAM. You can use the SQL DELETE command with or without the WHERE CLAUSE into the PHP function – mysql_query(). Summary: in this tutorial, you will learn various ways to delete duplicate rows in MySQL. In the previous tutorial, we have shown you how to find duplicate values in a table. Once the duplicates rows are identifie you may want to delete them to clean up your data.

Basically, we completely clear all records from the table. The table and with all its columns and definitions still exists. However, all records in the table will be deleted.

Java and J2EE developers, all examples are simple and easy to understan and well tested in our development environment. Yong Mook Kim, aka Mkyong. This tutorial use the com. The WHERE clause in DELETE statements is crucial if you wish to specify which records you want to eliminate.

If WHERE clause is not include you will delete all of your records. Hi All , How do I delete all the rows of all the tables(but not table) in the database at one shot. Regards, Ravi K The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not.

DELETE p FROM pixels p LEFT JOIN (SELECT id FROM pixels ORDER BY creation_time DESC LIMIT 5) pUSING(id) WHERE p2. It executes the subquery for each row in the outer query. Schema of a table can be dependent on the columns of other tables. When you delete a column in a table, all the elements in the Database that are dependent on the deleted column get affected. DELETE FROM table will do it row by row which also means it will have to update any indexes applicable to the table as it goes.

These statements use all three tables when searching for rows to delete , but delete matching rows only from tables tand t2. The preceding examples use INNER JOIN, but multiple-table DELETE statements can use other types of join permitted in SELECT statements, such as LEFT JOIN. But how will that interact with the auto increment counter?

Will truncate reset the counter. Be very careful with this. If there is a row , as in your example, the options are. MySQL deals with Relational Databases. The statement SQL DELETE ALL ROWS is used to delete all rows from the table.

You may want to delete rows because they are no longer neede or they were incorrectly added in the first place. The DELETE statement is used to remove rows from a SQL Server table. A single DELETE statement can remove a single row , or number of rows. Here is the basic syntax of the DELETE . Following PHP script shows how to use a delete statement in PHP. Two commented out queries correspond to first two conditions of the if-else block.

You can try out all three queries by commenting out two queries at a time. Say we want to delete the youngest employee from our previously created table because he has to go back to. If you leave off the where clause, all records will be deleted.