Question

我在数据库中有英寸大小的列 - 例如

1", 3/4", 15/16", 5/8" etc

因此，当我运行查询时，请说

SELECT * 
FROM TB_Items 
ORDER BY Size ASC

它返回：

 1", 5/8" , 3/4" , 15/16"

但我需要

5/8", 3/4", 15/16", 1"

请帮忙

注意：Size列数据类型为varchar

Answer 1

根据需要添加更多尺寸

..ORDER BY 
CASE WHEN inch_col = "5/8" THEN 1
 WHEN inch_col = "3/4" THEN 2
 WHEN inch_col = "15/16" THEN 3
 WHEN inch_col = "1" THEN 4
 ELSE 5 END

Answer 2

如果尺寸＆lt; = 1＆＃34;您可以使用相对复杂的表达式对结果集进行排序。创建计算持久列的更好方法。如果尺寸> 1种表达式要复杂得多

create table Item
(
    Id int not null identity primary key,
    Size varchar(100) not null
)
go

insert into Item (Size)
    values ('1"'), ('3/4"'), ('15/16"'), ('5/8"');
go

select 
    id, size
from 
    Item
order by
    CAST((CASE CHARINDEX('/', Size) WHEN 0 THEN SUBSTRING(Size, 1, LEN(Size) - 1) ELSE SUBSTRING(Size, 1, CHARINDEX('/', Size) - 1) END) as DECIMAL(18, 4)) /
    CASE CHARINDEX('/', Size) WHEN 0 THEN 1 ELSE CAST(SUBSTRING(Size, CHARINDEX('/', Size) + 1, LEN(Size) - CHARINDEX('/', Size) - 1) as INT) END

SQL Server按列排序具有英寸大小

2 个答案: