在 MySQL 中将 varchar 转换为无符号整数
mysqlmysqli database更新于 2025/11/4 22:36:17
要将 varchar 转换为无符号整数，请使用 CAST() 函数。让我们首先创建一个表 −
mysql> create table DemoTable868(Amount varchar(100)); Query OK, 0 rows affected (0.51 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable868 values('781');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable868 values('990');
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable868 values('1002');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable868 values('560');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable868 values('890');
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable868 values('9890');
Query OK, 1 row affected (0.06 sec)
mysql> insert into DemoTable868 values('8723');
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 DemoTable868;
这将产生以下输出 −
+--------+ | Amount | +--------+ | 781 | | 990 | | 1002 | | 560 | | 890 | | 9890 | | 8723 | +--------+ 7 rows in set (0.00 sec)
以下是将 varchar 转换为无符号整数的查询 −
mysql> select cast(Amount as unsigned) AS Amount from DemoTable868 order by Amount DESC;
这将产生以下输出 −
+--------+ | Amount | +--------+ | 9890 | | 8723 | | 1002 | | 990 | | 890 | | 781 | | 560 | +--------+ 7 rows in set (0.01 sec)
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