自加入SQL而不聚合

Question

I have a table with the below structure:

    ID   EmployeeType   Name
    1     Contract      John, Baxter
    2     Contract      Will, Smith
    3     Full          Josh, Stevens
    4     Full          Sitar, Zhang

All I need to do is Pivot it so I get the below output:

      Contract_Employee   FullTime_Employee
      John, Baxter        Josh, Stevens
      Will,Smith          Sitar, Zhang

Any idea how I can do this in one query?

Answer 1

That's kind of a funny request. Here's how I would do it: (basically, just deriving a fake key to "join" on for two derived tables, on for contractors, one for employees)

    CREATE TABLE #Table1
        ([ID] int, [EmployeeType] varchar(8), [Name] varchar(13))
    ;

    INSERT INTO #Table1
        ([ID], [EmployeeType], [Name])
    VALUES
        (1, 'Contract', 'John, Baxter'),
        (2, 'Contract', 'Will, Smith'),
        (3, 'Full', 'Josh, Stevens'),
        (4, 'Full', 'Sitar, Zhang'),
        (5, 'Full','Bob, Bob'),
        (6, 'Contract','Bob, Bob')
    ;


    select
    c.name as ContractEmployee,
    f.name as FullTime_Employee
    from
    (
    select
    row_number() over (order by id) as RN,
    name
    from
    #table1
    where 
    employeetype = 'Contract'
      ) c
    full join (
    select
    row_number() over (order by id) as RN,
    name
    from
    #table1
    where 
    employeetype = 'Full'
    ) f
    on 
c.name = f.name OR
c.rn = f.rn

Answer 2

One method of doing this is to use aggregation:

select max(case when employeetype = 'Contract' then Name end) as ContractEmployees,
       max(case when employeetype = 'Full' then Name end) as FullEmployees       
from (select t.*,
             row_number() over (partition by employeetype order by id) as seqnum
      from table t
     ) t
group by seqnum;