从MySQL表中删除多个条目
要从MySQL表中删除多个条目，请使用JOIN。让我们首先创建一个表-
create table DemoTabl(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100));
使用插入命令在表中插入一些记录-
insert into DemoTable(FirstName) values('Chris');
insert into DemoTable(FirstName) values('Bob');
insert into DemoTable(FirstName) values('Mike');
insert into DemoTable(FirstName) values('Adam');
insert into DemoTable(FirstName) values('Bob');
insert into DemoTable(FirstName) values('Adam');
insert into DemoTable(FirstName) values('Bob');
insert into DemoTable(FirstName) values('Mike');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 | 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-
delete DemoTable
from DemoTable
join DemoTable tbl on DemoTable.FirstName= tbl.FirstName
where tbl.FirstName = 'Bob';让我们再次检查表记录-
select *from DemoTable;
这将产生以下输出-
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris | | 3 | Mike | | 4 | Adam | | 6 | Adam | | 8 | Mike | +----+-----------+ 5 rows in set (0.00 sec)
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