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Order records and delete n rows in MySQL
Let us first create a table −
mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstName varchar(20) -> ); Query OK, 0 rows affected (0.65 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(FirstName) values('Chris');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(FirstName) values('Adam');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(FirstName) values('John');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(FirstName) values('David');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(FirstName) values('Mike');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable(FirstName) values('Carol');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(FirstName) values('Sam');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris | | 2 | Adam | | 3 | John | | 4 | David | | 5 | Mike | | 6 | Carol | | 7 | Sam | +----+-----------+ 7 rows in set (0.00 sec)
Here is the query to order records and delete n rows −
mysql> delete from DemoTable order by FirstName asc limit 4; Query OK, 4 rows affected (0.19 sec)
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+----+-----------+ | Id | FirstName | +----+-----------+ | 3 | John | | 5 | Mike | | 7 | Sam | +----+-----------+ 3 rows in set (0.00 sec)
Updated on: 12-Dec-2019
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