删除MySQL表中基于条件的部分行
首先创建一个表 −
mysql> create table DemoTable
-> (
-> Id int,
-> Name varchar(20)
-> );
Query OK, 0 rows affected (0.60 sec)
使用insert语句在表中插入一些记录:
使用insert语句在表中插入一些记录:
mysql> insert into DemoTable values(100,'Bob');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values(101,'Chris');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values(102,'David');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values(103,'Sam');
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable values(104,'Carol');
Query OK, 1 row affected (0.10 sec)
使用select语句显示表中的所有记录 −
mysql> select *from DemoTable;
这将产生以下输出 −
+------+-------+
| Id | Name |
+------+-------+
| 100 | Bob |
| 101 | Chris |
| 102 | David |
| 103 | Sam |
| 104 | Carol |
+------+-------+
5 rows in set (0.00 sec)
下面是删除表中有限行的查询语句 −
mysql> delete from DemoTable
-> where Id > 102;
Query OK, 2 rows affected (0.10 sec)
再次检查表记录 −
mysql> select *from DemoTable;
这将产生以下输出 −
+------+-------+
| Id | Name |
+------+-------+
| 100 | Bob |
| 101 | Chris |
| 102 | David |
+------+-------+
3 rows in set (0.00 sec)
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