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将数字设置为varchar字段并在MySQL中进行比较

2024-04-23 09:37:04 426

让我们首先创建一个表-

mysql> create table DemoTable
   -> (
   -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> StudentScore varchar(100)
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(StudentScore) values('90');

mysql> insert into DemoTable(StudentScore) values('100');

mysql> insert into DemoTable(StudentScore) values('56');

mysql> insert into DemoTable(StudentScore) values('98');

使用select语句-显示表中的所有记录；

mysql> select *from DemoTable;

输出结果

+-----------+--------------+
| StudentId | StudentScore |
+-----------+--------------+
|         1 | 90           |
|         2 | 100          |
|         3 | 56           |
|         4 | 98           |
+-----------+--------------+
4 rows in set (0.00 sec)

这是要在varchar字段中进行比较的查询-

mysql> select *from DemoTable where  CAST(StudentScore AS SIGNED) > 91;

输出结果

+-----------+--------------+
| StudentId | StudentScore |
+-----------+--------------+
|         2 | 100          |
|         4 | 98           |
+-----------+--------------+
2 rows in set (0.00 sec)

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将数字设置为varchar字段并在MySQL中进行比较

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