在TSQL使用旋轉

比方說，我有這個表：在TSQL使用旋轉

Name  Occupation 
Samantha Doctor 
Julia  Actor 
Maria  Actor 
Meera  Singer 
Ashely  Professor 
Ketty  Professor 
Christeen Professor 
Jane  Actor 
Jenny  Doctor 
Priya  Singer

我想有這樣的輸出：

Doctor  Professor Singer Actor 
    Jenny  Ashley  Meera Jane 
    Samantha Christeen Priya Julia 
    NULL  Ketty  NULL  Maria

我要佔領行轉換成列，然後通過列表中的名稱佔用。我一直在嘗試pivot關係運算符，但我們傳入pivot的第一個參數應該是一個聚合函數，所以我不確定這是否是解決此查詢的最佳方法。這是我一直在使用pivot但我使用max(name)當然工作，它只是一個返回名稱查詢：

select * from occupations 
pivot (max(name) for occupation in ([doctor],[actor],[singer],[professor])) 
as pvt

這是使用上面的查詢我的輸出：

doctor  actor singer professor 
Samantha Maria Priya Ketty

我可以使用pivot關係運算符來解決這個問題嗎？我可以做些什麼改變？

來源

2016-08-23 AlexGH

取代'SELECT * FROM occupations'使用'選擇* from（select *，row_number（）over（按職業順序劃分（選擇null））職業）o'。你想分配一個row_number或類似的東西，使每一行不同。編輯：如果你不想讓行號顯示在最終結果集中，只需選擇特定的列。 – ZLK

我傾向於使用條件的聚合，從而解決這些問題的：

select max(case when occupation = 'Doctor' then Name end) as doctor, 
     max(case when occupation = 'Actor' then Name end) as actor, 
     max(case when occupation = 'Singer' then Name end) as singer, 
     max(case when occupation = 'Professor' then Name end) as professor  
from (select t.*, 
      row_number() over (partition by occupation order by name) as seqnum 
     from thistable t 
    ) t 
group by seqnum 
order by seqnum;

來源

2016-08-23 06:14:34

此SQL

with data as (
    select * from (values 
     ('Samantha', 'Doctor') 
     ,('Julia', 'Actor') 
     ,('Maria', 'Actor') 
     ,('Meera', 'Singer') 
     ,('Ashely', 'Professor') 
     ,('Ketty', 'Professor') 
     ,('Christeen','Professor') 
     ,('Jane',  'Actor') 
     ,('Jenny', 'Doctor') 
     ,('Priya', 'Singer') 
    )t(Name,Occupation) 
), 
groups as (
    select 
     Name,Occupation, 
     RowNo = row_number() over (partition by Occupation order by Name) 
    from data 
) 
select 
    Doctor,Professor,Singer,Actor 
from groups 
pivot (max(Name) for occupation in (Doctor,Professor, Singer,Actor)) as pvt 
;

產量：

Doctor Professor Singer Actor 
--------- --------- --------- --------- 
Jenny  Ashely Meera  Jane 
Samantha Christeen Priya  Julia 
NULL  Ketty  NULL  Maria

來源

2016-08-23 05:41:05

在TSQL使用旋轉

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