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法律从 MySQL 数据库表中删除多个条目
要从 MySQL 数据库表中删除多个条目，请使用 JOIN。我们首先创建一个表 -
mysql> create table DemoTabl(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100)); Query OK, 0 rows affected (0.69 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable(FirstName) values('Chris');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable(FirstName) values('Bob');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(FirstName) values('Mike');
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable(FirstName) values('Adam');
Query OK, 1 row affected (0.33 sec)
mysql> insert into DemoTable(FirstName) values('Bob');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(FirstName) values('Adam');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(FirstName) values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(FirstName) values('Mike');
Query OK, 1 row affected (0.23 sec)使用 select 语句显示表中的所有记录 -
mysql> select *from DemoTable;
这将生成以下输出 -
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris | | 2 | Bob | | 3 | Mike | | 4 | Adam | | 5 | Bob | | 6 | Adam | | 7 | Bob | | 8 | Mike | +----+-----------+ 8 rows in set (0.00 sec)
以下是删除多个条目的查询 -
mysql> delete DemoTable from DemoTable join DemoTable tbl on DemoTable.FirstName= tbl.FirstName where tbl.FirstName = 'Bob'; Query OK, 3 rows affected (0.15 sec)
让我们再次查看表记录 -
mysql> select *from DemoTable;
这将生成以下输出 -
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris | | 3 | Mike | | 4 | Adam | | 6 | Adam | | 8 | Mike | +----+-----------+ 5 rows in set (0.00 sec)
更新日期： 2019-08-22
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