Sql Select 每个汇总组的前 3 名

Question

我如何 return 仅 return 以下每个 Name-datee 对的前 3 个值？

DECLARE @t TABLE(NAME NVARCHAR(MAX),datee date,val money)

insert INTO @t SELECT 'a','2012-01-02',100
insert INTO @t SELECT 'a','2012-01-02',100
insert INTO @t SELECT 'a','2012-01-03',100
insert INTO @t SELECT 'a','2012-01-05',150
insert INTO @t SELECT 'a','2012-01-06',200
insert INTO @t SELECT 'b','2012-01-07',200
insert INTO @t SELECT 'b','2012-01-07',400
insert INTO @t SELECT 'b','2012-01-09',500
insert INTO @t SELECT 'b','2012-01-12',600
insert INTO @t SELECT 'b','2012-01-13',100

SELECT Name, datee, SUM(val) sumval from @t 
GROUP BY rollup(NAME ,datee)
order by Name, sumval desc

当前版本 returns:

Name    datee       sumval
NULL    NULL        2450.00
a       NULL        650.00
a       2012-01-02  200.00
a       2012-01-06  200.00
a       2012-01-05  150.00
a       2012-01-03  100.00
b       NULL        1800.00
b       2012-01-07  600.00
b       2012-01-12  600.00
b       2012-01-09  500.00
b       2012-01-13  100.00

我愿意return:

Name    datee       sumval
NULL    NULL        2450.00
a       NULL        650.00
a       2012-01-02  200.00
a       2012-01-06  200.00
a       2012-01-05  150.00
b       NULL        1800.00
b       2012-01-07  600.00
b       2012-01-12  600.00
b       2012-01-09  500.00

我以为会有一个简单的方法，但想不通！

Answer 1

也许使用 row_number 和 subquery 可以达到你的结果：

select * 
from (
    select *, 
           row_number() over (partition by name order by sumval desc) rn
    from (
        select Name, datee, SUM(val) sumval
        from @t 
        group by rollup(NAME ,datee)
        order by Name, sumval desc
    ) t
) t
where rn <= 3 or datee is null

您可以改用 row_number() over (partition by name order by sum(val)) 并删除其中一个子查询。

select * 
from (
        select Name, datee, SUM(val) sumval, 
        row_number() over (partition by name order by SUM(val) desc) rn
        from @t 
        group by rollup(NAME ,datee)
        order by Name, sumval desc
) t
where rn <= 3 or datee is null

Answer 2

您需要使用 RANK() 或 ROW_NUMBER() 来索引输出，然后您需要将其包装到一个子查询中，并过滤掉任何超过您需要的数字的行。

像这样：

SELECT 
    t.Name, 
    t.date,
    t.sumval 
FROM
(
    SELECT 
        Name, 
        date, 
        SUM(val) sumval, 
        ROW_NUMBER() OVER (ORDER BY sumval, PARTITION BY name) RowId
    from @t GROUP BY rollup(NAME ,datee)
) t 
WHERE RowId <= 3
order by Name, sumval desc

Answer 3

;with cteBase as (
Select Name
      ,datee
      ,sumval=SUM(val)
      ,rowNr=ROW_NUMBER() over (Partition By Name Order by sum(Val) Desc)
 From @t 
GROUP BY rollup(NAME ,datee)
)
Select * 
 From cteBase 
 Where RowNr<=4
order by Name, sumval desc

Returns

Name    datee       sumval  rowNr
NULL    NULL        2450.00 1
a       NULL        650.00  1
a       2012-01-02  200.00  2
a       2012-01-06  200.00  3
a       2012-01-05  150.00  4
b       NULL        1800.00 1
b       2012-01-07  600.00  2
b       2012-01-12  600.00  3
b       2012-01-09  500.00  4

Answer 4

由于rollup，这是一个很大的复杂性。我认为以下方法可行：

SELECT t.*
FROM (SELECT Name, datee, SUM(val) as sumval,
             ROW_NUMBER() OVER (PARTITION BY Name ORDER BY SUM(val) DESC) as seqnum
      FROM @t  t
      GROUP BY rollup(NAME, datee)
     ) t
WHERE seqnum <= 3 or Datee is NULL
ORDER BY Name, sumval desc;

如果这不起作用（我现在无法测试），这将：

SELECT Name, datee, sumval
FROM (SELECT Name, datee, SUM(sumval) as sumval, MAX(seqnum) as seqnum
      FROM (SELECT Name, datee, SUM(val) as sumval,
                   ROW_NUMBER() OVER (PARTITION BY Name ORDER BY SUM(val) DESC) as seqnum
            FROM @t  t
            GROUP BY Name, datee
           ) t
      GROUP BY rollup(NAME, datee)
     ) t
WHERE seqnum <= 3 or Date is NULL
ORDER BY Name, sumval desc;

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