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MySQL SELECT from a subquery and then perform DELETE?
Let us first create a table −
mysql> create table DemoTable1947 ( Id int, Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1947 values(101,'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1947 values(102,'David'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1947 values(103,'Mike'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1947 values(104,'Bob'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1947 values(105,'Sam'); Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1947;
This will produce the following output −
+------+-------+ | Id | Name | +------+-------+ | 101 | Chris | | 102 | David | | 103 | Mike | | 104 | Bob | | 105 | Sam | +------+-------+ 5 rows in set (0.00 sec)
Here is the query to implement select * from subquery and then perform DELETE −
mysql> delete from DemoTable1947 where Id IN(select * from (select Id from DemoTable1947 order by Id limit 3)as t); Query OK, 3 rows affected (0.00 sec)
Let us check the table records once again −
mysql> select * from DemoTable1947;
This will produce the following output −
+------+------+ | Id | Name | +------+------+ | 104 | Bob | | 105 | Sam | +------+------+ 2 rows in set (0.00 sec)
Updated on: 31-Dec-2019
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