如何根据带下划线的单词(如MONTH_JAN')删除记录?
mysqlmysqli database
为此，您可以使用 LIKE 运算符。让我们首先创建一个表 −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(40), BornMonth varchar(40) ); Query OK, 0 rows affected (0.47 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable(Name,BornMonth) values('Chris','MONTH_DEC');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(Name,BornMonth) values('Bob','MONTH_JAN');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name,BornMonth) values('Mike','MONTH_FEB');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(Name,BornMonth) values('David','MONTH_JAN');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(Name,BornMonth) values('Carol','MONTH_MARCH');
Query OK, 1 row affected (0.16 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 | BornMonth | +----+-------+-------------+ | 1 | Chris | MONTH_DEC | | 2 | Bob | MONTH_JAN | | 3 | Mike | MONTH_FEB | | 4 | David | MONTH_JAN | | 5 | Carol | MONTH_MARCH | +----+-------+-------------+ 5 rows in set (0.00 sec)
以下是根据单词删除记录的查询 −
mysql> delete from DemoTable where BornMonth LIKE '%MONTH_JAN%'; Query OK, 2 rows affected (0.18 sec)
让我们再次检查表记录 −
mysql> select *from DemoTable;
这将产生以下输出 −
+----+-------+-------------+ | Id | Name | BornMonth | +----+-------+-------------+ | 1 | Chris | MONTH_DEC | | 3 | Mike | MONTH_FEB | | 5 | Carol | MONTH_MARCH | +----+-------+-------------+ 3 rows in set (0.00 sec)
