The mysql statement to delete data is "DELETE", which can delete one or more rows of data in the data table. The syntax format is "DELETE FROM
[WHERE clause] [ORDER BY clause] [LIMIT clause]".
The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.
In MySQL, you can use the DELETE statement to delete one or more rows of data in a table.
DELETE statement can delete data from a single table. The syntax format is:
DELETE FROM <表名> [WHERE 子句] [ORDER BY 子句] [LIMIT 子句]Copy after loginThe syntax description is as follows:
- ##
: Specify the table name from which data is to be deleted.
- ORDER BY clause: Optional. Indicates that when deleting, rows in the table will be deleted in the order specified in the clause.
- WHERE clause: Optional. Indicates that the deletion conditions are limited for the deletion operation. If this clause is omitted, it means that all rows in the table are deleted.
- LIMIT clause: Optional. Used to tell the server the maximum number of rows to be deleted before the control command is returned to the client.
Note: When the WHERE condition is not used, all data will be deleted.Usage example of DELETE statement
Delete all data in the table
[Example 1] Delete all data in the tb_courses_new tablemysql> DELETE FROM tb_courses_new; Query OK, 3 rows affected (0.12 sec) mysql> SELECT * FROM tb_courses_new; Empty set (0.00 sec)Copy after loginDelete data in the table based on conditions
[Example 2] In the tb_courses_new table, delete the course_id as 4 The recordIt can be seen from the running results that the record with course_id 4 has been deleted. [Related recommendations:mysql> DELETE FROM tb_courses -> WHERE course_id=4; Query OK, 1 row affected (0.00 sec) mysql> SELECT * FROM tb_courses; +-----------+-------------+--------------+------------------+ | course_id | course_name | course_grade | course_info | +-----------+-------------+--------------+------------------+ | 1 | Network | 3 | Computer Network | | 2 | Database | 3 | MySQL | | 3 | Java | 4 | Java EE | +-----------+-------------+--------------+------------------+ 3 rows in set (0.00 sec)Copy after loginmysql video tutorial]
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