根据SQL中的固定行数将长列拆分为多列

Question

我正在学习SQL脚本。例如，我有以下天气数据：

FriApr 13
Light rain
4°C
1
3°
80%
5-10 mm
-
16 km/h E
1
SatApr 14
Mixed precipitation
3°C
-1
-2°
90%
25-35 mm
-
26 km/h NE
0
SunApr 15
Freezing rain
2°C
-4
2°
80%
20-30 mm
-
37 km/h NE
0

我想将此单个长列拆分为多个列，每隔10行查看一次：

FriApr 13    |  SatApr 14            | SunApr 15
Light rain   | Mixed precipitation   | Freezing rain
4°C          | 3°C                   | 2°C
1            | -1                    | -4
3°           | 2°                    | 2°
80%          | 90%                   | 80%
5-10 mm      | 25-35 mm              | 20-30 mm
-            | -                     | -
16 km/h E    | 26 km/h NE            | 37 km/h NE 
1            | 0                     | 0

最后想要实现这个表（上面的转置）

Date     | Condition         | H3| H4| H5| H6 |H7      |H8| H9       | H10   
---------------------------------------------------------------------------
FriApr 13|Light rain         |4°C| 1 |3° |80% |5-10 mm |- |16 km/h E | 1
SatApr 14|Mixed precipitation|3°C|-1 |2° |90% |25-35 mm|- |26 km/h E | 0  
SunApr 15|Freezing rain      |2°C|-4 |2° |80% |20-30 mm| -|37 km/h E | 0

我正在使用MS SQL server 2014，并尝试搜索它但找不到任何解决方案。有人可以帮忙吗？

Answer 1

可行，但有点难看。假设源是一个长字符串。

示例

Declare @S varchar(max) ='FriApr 13
Light rain
4°C
1
3°
80%
5-10 mm
-
16 km/h E
1
SatApr 14
Mixed precipitation
3°C
-1
-2°
90%
25-35 mm
-
26 km/h NE
0
SunApr 15
Freezing rain
2°C
-4
2°
80%
20-30 mm
-
37 km/h NE
0
'

;with cte0 as (
        Select RetSeq = Row_Number() over (Order By (Select null))
              ,RetVal = LTrim(RTrim(B.i.value('(./text())[1]', 'varchar(max)')))
        From  (Select x = Cast('<x>' + replace((Select replace(@S,char(13)+char(10),'§§Split§§') as [*] For XML Path('')),'§§Split§§','</x><x>')+'</x>' as xml).query('.')) as A 
        Cross Apply x.nodes('x') AS B(i) ),
      cte1 as ( Select *,Grp = max(case when right(RetSeq,1)='1' then RetSeq End) over (Order by RetSeq) from cte0 ),
      cte2 as ( Select *,RN = Row_Number() over (Partition By Grp Order by RetSeq) From cte1 )
Select [Date]    = max(case when RN=1  then RetVal end)
      ,Condition = max(case when RN=2  then RetVal end)
      ,H3        = max(case when RN=3  then RetVal end)
      ,H4        = max(case when RN=4  then RetVal end)
      ,H5        = max(case when RN=5  then RetVal end)
      ,H6        = max(case when RN=6  then RetVal end)
      ,H7        = max(case when RN=7  then RetVal end)
      ,H8        = max(case when RN=8  then RetVal end)
      ,H9        = max(case when RN=9  then RetVal end)
      ,H10       = max(case when RN=10 then RetVal end)
 From  cte2
 Group By Grp
 Having max(case when RN=1  then RetVal end) is not null

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