[英]What would be the best way to write a query to produce a table given the following data?
我有一個包含以下數據的表:
ADD_Col Data OrderId Output NEW_ADD Col1 Col2
----- ------ ------- -----> ------- -------- -------
AD*A*1 A 96 A 1 2
AD*A*1 B 95 B 1 1
AD*A*1 C 94 C 0.8 1
AD*A*1 D 93 D 5 2
AD*A*2 1 92
AD*A*2 1 91
AD*A*2 0.8 90
AD*A*2 5 89
AD*A*3 2 88
AD*A*3 1 87
AD*A*3 1 86
AD*A*3 2 85
這些數據都在同一個表中,我需要將每個字母鏈接到每個因素。 我正在考慮做一個ROW_NUMBER()
並根據各自的行號加入,並為我的字母分配相同的數字或DENSERANK
。 實現這一目標的最佳方法是什么? 如果可以,請提供查詢示例,非常感謝。
select t1.Data "Key"
, t2.Data "Col1"
, t3.Data "Col2"
from ((SELECT Data,
row_number() over (order by Key_C) rn
from my_table
where Key_C = 'AD*A*1') t1
left join
(SELECT Data,
row_number() over (order by Key_C) rn
from my_table
where Key_C = 'AD*A*2') t2
on t1.rn = t2.rn
left join
(SELECT Data,
row_number() over (order by Key_C) rn
from my_table
where Key_C = 'AD*A*3') t3
on t2.rn = t3.rn);
這是演示
對於您的示例數據,這將起作用:
with cte as (
select *,
row_number() over (partition by [key] order by [OrderId desc]) rn,
dense_rank() over (order by [key]) rk
from tablename
)
select t1.data,
max(case when t2.rk = 2 then t2.data end) col1,
max(case when t2.rk = 3 then t2.data end) col2
from (select * from cte where rk = 1) t1
inner join (select * from cte where rk in (2, 3)) t2
on t2.rn = t1.rn
group by t1.data
請參閱演示。
結果:
> data | col1 | col2
> :--- | :--- | :---
> A | 1 | 2
> B | 1 | 1
> C | 0.8 | 1
> D | 5 | 2
似乎您需要做的是在這里標准化您的數據。 在這里,我使用PARSENAME
獲取“列號”,然后使用ROW_NUMBER
對組中的相關行進行編號。 最后我使用交叉表到 Pivot 到數據:
WITH CTE AS(
SELECT V.[Key],
V.data,
V.[Order],
PARSENAME(REPLACE(V.[Key],'*','.'),1) AS ColNo,
ROW_NUMBER() OVER (PARTITION BY V.[Key] ORDER BY V.[Order] DESC) AS RN
FROM (VALUES('AD*A*1','A',96),
('AD*A*1','B',95),
('AD*A*1','C',94),
('AD*A*1','D',93),
('AD*A*2','1',92),
('AD*A*2','1',91),
('AD*A*2','0.8',90),
('AD*A*2','5',89),
('AD*A*3','2',88),
('AD*A*3','1',87),
('AD*A*3','1',86),
('AD*A*3','2',85))V([Key],[data],[Order]))
SELECT MAX(CASE C.ColNo WHEN '1' THEN C.[data] END) AS New_ADD,
MAX(CASE C.ColNo WHEN '2' THEN C.[data] END) AS Col1,
MAX(CASE C.ColNo WHEN '3' THEN C.[data] END) AS Col2
FROM CTE C
GROUP BY C.RN;
DROP TABLE IF EXISTS #RawData
SELECT
[ADD_Col]
,[Data]
,[OrderId]
,REPLACE([ADD_Col], 'AD*A*', '') AS [Level]
,DENSE_RANK() OVER (PARTITION BY [ADD_Col] ORDER BY [OrderId] DESC) AS [Grouping]
INTO
#RawData
FROM
[SourceTable]
SELECT
rd.[Data]
,rdc1.[Data] AS [Col1]
,rdc2.[Data] AS [Col2]
FROM
#RawData AS rd
LEFT OUTER JOIN #RawData AS rdc1
ON rdc1.[Level] = 2
AND rd.[Grouping] = rdc1.[Grouping]
LEFT OUTER JOIN #RawData AS rdc2
ON rdc2.[Level] = 3
AND rd.[Grouping] = rdc2.[Grouping]
WHERE
rd.[Level] = 1
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