MySQL 查询删除 ID 最小的记录?
mysqlmysqli database
要删除 ID 最小的记录，可以使用以下语法:
delete from yourTableName order by yourColumnName limit 1;
首先我们创建一个表:
mysql> create table DemoTable ( Id int, Name varchar(20) ); Query OK, 0 rows affected (0.75 sec)
以下是使用 insert 命令在表中插入记录的查询:
mysql> insert into DemoTable values(10,'Larry'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(100,'Mike'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(30,'Sam'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(90,'Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(9,'Carol'); Query OK, 1 row affected (0.19 sec)
以下是使用 select 命令显示表中记录的查询:
mysql> select *from DemoTable;
这将产生以下输出:
+------+-------+ | Id | Name | +------+-------+ | 10 | Larry | | 100 | Mike | | 30 | Sam | | 90 | Chris | | 9 | Carol | +------+-------+ 5 rows in set (0.00 sec)
以下是删除具有最低 ID 的记录的查询:
mysql> delete from DemoTable order by Id limit 1; Query OK, 1 row affected (0.18 sec)
让我们显示表中的所有记录以检查最低 ID 是否已被删除:
mysql> select *from DemoTable;
这将产生以下输出 −
+------+-------+ | Id | Name | +------+-------+ | 10 | Larry | | 100 | Mike | | 30 | Sam | | 90 | Chris | +------+-------+ 4 rows in set (0.00 sec)
