如何在 MySQL 中删除值超过特定值的字段?
mysqlmysqli database更新于 2025/12/10 5:00:17
首先我们创建一个表 −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, PlayerName varchar(100), PlayerScore int ); Query OK, 0 rows affected (0.97 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable(PlayerName,PlayerScore) values('Chris',780);
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable(PlayerName,PlayerScore) values('Sam',1100);
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable(PlayerName,PlayerScore) values('Mike',900);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(PlayerName,PlayerScore) values('Bob',890);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(PlayerName,PlayerScore) values('Carol',1000);
Query OK, 1 row affected (0.20 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 | PlayerName | PlayerScore | +----+------------+-------------+ | 1 | Chris | 780 | | 2 | Sam | 1100 | | 3 | Mike | 900 | | 4 | Bob | 890 | | 5 | Carol | 1000 | +----+------------+-------------+ 5 rows in set (0.00 sec)
以下是在 MySQL 中删除值超过特定值的字段的查询 −
mysql> delete from DemoTable where PlayerScore > 900; 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 | PlayerName | PlayerScore | +----+------------+-------------+ | 1 | Chris | 780 | | 3 | Mike | 900 | | 4 | Bob | 890 | +----+------------+-------------+ 3 rows in set (0.00 sec)
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mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
