mysql条件删除表中某些行数据_根据MySQL中的条件仅删除表中的某些行
让我们首先创建一个表-create table DemoTable
-> (
-> Id int,
-> Name varchar(20)
-> );
使用insert命令在表中插入一些记录：Insert some records in the table using insert command:
insert into DemoTable values(100,'Bob');
insert into DemoTable values(101,'Chris');
insert into DemoTable values(102,'David');
insert into DemoTable values(103,'Sam');
insert into DemoTable values(104,'Carol');
使用select语句显示表中的所有记录-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)
以下是从表中仅删除有限行的查询-delete from DemoTable
-> where Id > 102;
让我们再次检查表记录-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)