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MySQL查询将高度格式转换为厘米？

2024-05-14 09:21:04 412

为此，请使用CAST()MySQL中的方法。让我们首先创建一个表-

mysql> create table DemoTable
(
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   StudentHeight varchar(40)
) ;

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(StudentHeight) values('5\'10\"');
mysql> insert into DemoTable(StudentHeight) values('4\'6\"');
mysql> insert into DemoTable(StudentHeight) values('5\'8\"');

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 | StudentHeight |
+----+---------------+
|  1 | 5'10"         |
|  2 | 4'6"          |
|  3 | 5'8"          |
+----+---------------+
3 rows in set (0.00 sec)

以下是将高度格式转换为厘米的查询-

mysql> select
   (cast(substr(StudentHeight,1,locate("'",StudentHeight)-1) as unsigned)*30.48)+
   (cast(substr(StudentHeight,locate("'",StudentHeight)+1) as unsigned)*2.54) AS Centimeters
   from DemoTable;

这将产生以下输出-

+-------------+
| Centimeters |
+-------------+
| 177.80      |
| 137.16      |
| 172.72      |
+-------------+
3 rows in set, 3 warnings (0.05 sec)

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MySQL查询将高度格式转换为厘米？

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