查询顺序问题

Question

我必须像这样订购以下类别：

我如何通过 SQL 查询完成此操作？

我试过：

Select * 
From table 
Order By len(category_name), category_name

但他们的订单是这样的：

如有任何帮助，我们将不胜感激！

Answer 1

您可以使用标量值函数（有关标量值函数的更多信息here) that removes letters from your categories' names (more information about this specific function here）并使用结果对您的数据进行排序：

--1. declare a new function that removes all letters from your category name
--1.1 if the function already exists delete it
if OBJECT_ID('fx_remove_letters') is not null
drop function fx_remove_letters

go
--1.2 create a function to remove all letters (CHAR(65) is letter A, char(90) is letter Z)
create function fx_remove_letters(@str NVARCHAR(max))
returns  NVARCHAR(max)
as
begin
    DECLARE @loop INT
    SET @loop = 0
    WHILE @loop < 26
        BEGIN
        SET @str = REPLACE(@str, CHAR(65 + @loop), '')
        SET @loop = @loop + 1
        END
    return @str
end
go
--2. this table variable holds your categories in a random order
declare @tmp table (category_name nvarchar(10))

--3. populate the test table variable 
insert into @tmp 
values('6D'),('2'),('3'),('12'),('5'),('6C'),('6B'),
      ('1'),('7A'),('4'),('7B'),('10'),('11'),('6A')

--4. select your data ordering them with the function we defined at the beginning
select category_name 
from @tmp 
order by cast(dbo.fx_remove_letters(category_name) as int), category_name

这是订购前的table：

现在order by之后的结果：

Answer 2

这有帮助吗？

SELECT category_name
FROM #Table1
ORDER BY 
    CASE ISNUMERIC(category_name) 
        WHEN 1 THEN REPLICATE('0', 10 - LEN(category_name)) + category_name       
        ELSE REPLICATE('0', 10 - LEN(category_name)+1) + category_name     
    END

如果您的输入中包含“6AA”、“6AB”等，您可以使用以下查询：

SELECT category_name
    FROM #Table1
    ORDER BY 
        CASE 
            WHEN ISNUMERIC(category_name) =1 
                THEN REPLICATE('0', 10 - LEN(category_name)) + category_name
            ELSE 
                REPLICATE('0', 10 - LEN(category_name)+LEN(STUFF(category_name, PATINDEX('%[^a-zA-Z]%',category_name),1,''))) + category_name   
        END

查询顺序问题

Issues with query order

tsql

sql-server

sql-order-by

sql-server-2014