在TSQL使用旋转

比方说，我有这个表：在TSQL使用旋转

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

我想有这样的输出：

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

我要占领行转换成列，然后通过列表中的名称占用。我一直在尝试pivot关系运算符，但我们传入pivot的第一个参数应该是一个聚合函数，所以我不确定这是否是解决此查询的最佳方法。这是我一直在使用pivot但我使用max(name)当然工作，它只是一个返回名称查询：

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

这是使用上面的查询我的输出：

doctor  actor singer professor 
Samantha Maria Priya Ketty

我可以使用pivot关系运算符来解决这个问题吗？我可以做些什么改变？

来源

2016-08-23 AlexGH

取代'SELECT * FROM occupations'使用'选择* from（select *，row_number（）over（按职业顺序划分（选择null））职业）o'。你想分配一个row_number或类似的东西，使每一行不同。编辑：如果你不想让行号显示在最终结果集中，只需选择特定的列。 – ZLK

我倾向于使用条件的聚合，从而解决这些问题的：

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;

来源

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 
;

产量：

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

来源

2016-08-23 05:41:05

在TSQL使用旋转

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