xQuery - 正在返回MAX行

Question

我正在拉什麼我留下的頭髮！結果集都很好，但我現在需要做其他事情。這裏的T-SQL

SELECT documentdate 
,  x.a.value('(Date)[1]','varchar(50)') as [Date] 
,  x.a.value('(ReadCode)[1]','varchar(50)') as [Read Code] 
,  x.a.value('(Rubric)[1]','varchar(200)') as [Rubric] 
,  x.a.value('(Notes)[1]','varchar(200)') as [Notes] 
,  x.a.value('(Notes1)[1]','varchar(200)') as [Notes1] 
,  x.a.value('(Episodicity)[1]','varchar(50)') as [Episodicity] 
,  REF.dbo.PATs.OptedOut 

FROM 
EPR.dbo.PCTX_CONT t INNER JOIN 
REF.dbo.PATNumbers 
ON t.PATNoID = REF.dbo.PATNumbers.PATNoID 

INNER JOIN 
REF.dbo.PATs ON 
REF.dbo.PATNumbers.CurrentNo = 
REF.dbo.PATs.ManorNo 

CROSS APPLY 
t.DocumentXML.nodes('//CONT') x(a) 

WHERE REPLACE(REF.dbo.PATNumbers.CurrentNo,' ','')=123456789 

的結果是

2010-05-13 8I64. 
2010-05-13 8I6C. 
2010-02-09 8I24. 
2010-02-09 8I65. 
2010-02-09 8I26. 
2010-02-09 8I6B. 
2009-06-02 8I24. 
2009-03-17 8I26. 
2009-01-06 8I64. 
2009-01-06 8I6C. 
2006-11-14 8I74. 
2006-11-14 8I75. 

但是我需要的是一個代碼的最新排故的結果將是

2010-05-13 8I64. 
2010-05-13 8I6C. 
2010-02-09 8I24. 
2010-02-09 8I65. 
2010-02-09 8I26. 
2010-02-09 8I6B. 
2006-11-14 8I74. 
2006-11-14 8I75. 

Answer 1

我猜測你代碼是專欄

select documentdate,[Date], [Read Code], [Rubric], [Notes], [Notes1], 
[Episodicity],REF.dbo.PATs.OptedOut FROM 
(
SELECT documentdate 
,  x.a.value('(Date)[1]','varchar(50)') as [Date] 
,  x.a.value('(ReadCode)[1]','varchar(50)') as [Read Code] 
,  x.a.value('(Rubric)[1]','varchar(200)') as [Rubric] 
,  x.a.value('(Notes)[1]','varchar(200)') as [Notes] 
,  x.a.value('(Notes1)[1]','varchar(200)') as [Notes1] 
,  x.a.value('(Episodicity)[1]','varchar(50)') as [Episodicity] 
,  REF.dbo.PATs.OptedOut 
,  row_number() over (partition by x.a.value('(Rubric)[1]','varchar(200)') 
     order by x.a.value('(Date)[1]','varchar(50)') desc) as rn 
FROM 
EPR.dbo.PCTX_CONT t INNER JOIN 
REF.dbo.PATNumbers 
ON t.PATNoID = REF.dbo.PATNumbers.PATNoID 

INNER JOIN 
REF.dbo.PATs ON 
REF.dbo.PATNumbers.CurrentNo = 
REF.dbo.PATs.ManorNo 

CROSS APPLY 
t.DocumentXML.nodes('//CONT') x(a) 

WHERE REPLACE(REF.dbo.PATNumbers.CurrentNo,' ','')=123456789 
) a where rn = 1