SQL Server - 将行转换为列

Question

We have a table in our MSSQL database, that store Office Person relation ship data. The table structure is

CREATE TABLE (
    OfficeID UNIQUEIDENTIFIER
    PersonID UNIQUEIDENTIFIER
    Designation VARCHAR(20)
)

The table will have value

    E1F5ECA9-7D5A-4580-AA7D-0003A582F286|E1F5ECA9-7D5A-3580-AA7D-0003A582F286|Manager
    E1F5ECA9-7D5A-4580-AA7D-0003A582F286|E1F5ECA9-7D5A-3580-AA7D-0003A582F286|Engineer
    E2F5ECA9-7D5A-4580-AA7D-0003A582F286|E2F5ECA9-7D5A-3580-AA7D-0003A582F286|Manager
    E2F5ECA9-7D5A-4580-AA7D-0003A582F286|E2F5ECA9-7D5A-3580-AA7D-0003A582F286|Engineer

What I want to get is each office can have only one Manager and one Engineer. The output I am expecting is

OfficeID|Manager ID| Engineer ID|
E1F5ECA9-7D5A-4580-AA7D-0003A582F286|E1F5ECA9-7D5A-3580-AA7D-0003A582F286| E1F5ECA9-7D5A-3580-AA7D-0003A582F286
E2F5ECA9-7D5A-4580-AA7D-0003A582F286|E2F5ECA9-7D5A-3580-AA7D-0003A582F286|E2F5ECA9-7D5A-3580-AA7D-0003A582F286

How can i form the query for getting the data in this format?

Regards,

John

Answer 1

using conditional aggregation:

select 
    OfficeId
  , ManagerId  = max(case when Designation = 'Manager'  then PersonId end)
  , EngineerId = max(case when Designation = 'Engineer' then PersonId end)
from t
group by OfficeId

or using pivot() :

select
    OfficeId
  , ManagerId = Manager
  , EngineerId = Engineer
from t
pivot (max(PersonId) for Designation in ([Manager],[Engineer])) p

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