Question

我有一个查询，查询到的数据列表如下：

每个内容都有一个特定的类别，每个类别都有一个用于根据类别播放或不根据类别播放的复选框。

Id  Category    content_type   Content   IsCategorywise
=====================================================
1   ABC         Image          content1  1
2   ABC         Image          content2  1
3   EFG         Video          content3  0
4   EFG         Image          content4  0
5   EFG         Image          content5  0
6   XYZ         Image          content6  1
7   XYZ         Image          content7  1

所以我在这里得到3个小组：

Id  Category    content_type   Content   IsCategorywise
=====================================================
1   ABC         Image          content1  1
2   ABC         Image          content2  1

Id  Category    content_type   Content   IsCategorywise
=====================================================
3   EFG         Video          content3  0
4   EFG         Image          content4  0
5   EFG         Image          content5  0

Id  Category    content_type   Content   IsCategorywise
=====================================================
6   XYZ         Image          content6  1
7   XYZ         Image          content7  1

现在，如果所有内容的IsCategoryWise为1，我想要下面的顺序：

第一组的第一内容，第二组的第一内容，第三组的第一内容
第一组的第二个内容，第二组的第二个，第三组的第二个
第一组的第3个内容，第二组的第3个，第三组的第3个

但是，如果任何类别组的IsCategoryWise为0，那么它们将始终处于相同的顺序：

第一组的第一内容，（第二组的所有3个内容），第三组的第一内容
第一组的第二个内容，（第二组的所有三个内容），第三组的第二个内容

所需的输出：

Id  Category    content_type   Content   IsCategorywise
=====================================================
1   ABC         Image          content1  1
3   EFG         Video          content3  0
4   EFG         Image          content4  0
5   EFG         Image          content5  0
6   XYZ         Image          content6  1

2   ABC         Image          content2  1
3   EFG         Video          content3  0
4   EFG         Image          content4  0
5   EFG         Image          content5  0
7   XYZ         Image          content7  1

在SQL Server查询或C＃linq中怎么可能？

Answer 1

请参考代码中的注释以获取解释

-- create sample table
declare @tbl table
(
    Id              int,
    Category        varchar(10),
    content_type    varchar(10),  
    Content         varchar(10), 
    IsCategorywise  int
)

-- insert sample data
insert into @tbl 
values
    (1,   'ABC',         'Image',          'content1',  1),
    (2,   'ABC',         'Image',          'content2',  1),
    (3,   'EFG',         'Video',          'content3',  0),
    (4,   'EFG',         'Image',          'content4',  0),
    (5,   'EFG',         'Image',          'content5',  0),
    (6,   'XYZ',         'Image',          'content6',  1),
    (7,   'XYZ',         'Image',          'content7',  1)

-- the query
; with 
-- use numbers / tally table if you have one. 
numbers as
(
    select  n = 1
    union all
    select  n = n + 1
    from    numbers
    where   n < 10
),
cte as
(
    select  *,      
            -- Group wise IsCategorywise value
            GrpCW   = min(IsCategorywise) over (partition by Category),
            -- generate row_number for GrpCW = 1 for each category order by Id
            rn  = case  when    min(IsCategorywise) over (partition by Category) = 1
                        then    row_number() over (partition by Category order by Id)
                        end
    from    @tbl
),
cte2 as
(
    select  *, 
            -- m is for repeating the GrpCW = 0 for each grouping
            m = case when GrpCW = 1 then 1 else max(rn) over () end
    from    cte
)
-- basically you want to order by "rn" but for cases where IsCategorywise = 0,
-- you want to repeat it. That is where the inner join to "numbers" comes in
select  Id, Category, content_type, Content, IsCategorywise
from    cte2 c
        inner join numbers n    on  n.n <= c.m
order by coalesce(rn, n), Category, Id

/*
Id          Category   content_type Content    IsCategorywise
----------- ---------- ------------ ---------- --------------
1           ABC        Image        content1   1
3           EFG        Video        content3   0
4           EFG        Image        content4   0
5           EFG        Image        content5   0
6           XYZ        Image        content6   1
2           ABC        Image        content2   1
3           EFG        Video        content3   0
4           EFG        Image        content4   0
5           EFG        Image        content5   0
7           XYZ        Image        content7   1
*/

Answer 2

POST

“ orderby”字段进行正确的排序。

按给定顺序更改顺序

2 个答案: