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#Delete mysql how to#
It is very helpful to understand how to use the WHERE clause effectively during DELETE statement: 25 Essential MySQL Select Command Examples 3. We discussed a lot about the various practical WHERE conditions in our MySQL select command tutorial. As we see from the following output, we don’t see records with dept “Technology” anymore. The above output indicates that it has deleted 3 records. MariaDB > DELETE FROM employee WHERE dept LIKE 'Tech%' So, this will delete all the records where the department is “Technology”. The following example will delete records from employee table where the value in the dept column begins with “Tech”. For partial matching use % in the value column. You can delete records from a table by matching a string column with certain criteria.įor string, you can use the keyword “like” which will do a partial matching. Delete Multiple Rows Using String Column Matching The first record with id of 100 is now deleted from the employee table. Finally, this will also show how long it took for MySQL to execute the query (for example: 0.01 seconds). Even when it didn’t delete any record, this line will still say “Query OK” as long as there were no syntax error and the statement was clean. If there is a syntax error, it will display it here. The output will also say “Query OK” if the query was executed.As you see from the above output, it says “1 row affected”, which means that it has deleted one row. The output of the delete command will show you how many records it has deleted.MariaDB > DELETE FROM employee WHERE id = 100 The following example will delete one record from employee table which has the id of 100. To delete a specific row, you should specify the WHERE condition using one of the primary column value, or a unique column value. If you are new to MySQL, you should probably first understand MySQL basics including how to create MySQL database. To delete records from a table, you should have DELETE privilege on the particular table from where you are trying to delete the rows.įor this tutorial, we’ll be using the following employee table as an example. Delete records from multiple tables using INNER join.Delete records with LOW_PRIORITY option.When to use order by with Delete operation?.Delete Vs Truncate (for deleting all rows).Delete multiple rows (using string column matching).Delete multiple rows (using number column matching).
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The following are covered in this tutorial: In this tutorial, we’ll explain how to use MySQL Delete with some useful examples. When you are working on MySQL database, on several situations you may want to delete existing records from one or more tables.