在 MySQL 中将 varchar 转换为无符号整数
要将 varchar 转换为无符号整数,请使用 CAST() 函数。我们首先创建一个表,如下所示:
mysql> create table DemoTable868(Amount varchar(100)); Query OK, 0 rows affected (0.51 sec)
使用 insert 命令向表中插入一些记录,如下所示:
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,如下所示:
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)
广告