проблема в написании SQL-запроса

Question

Получение проблемы при написании SQL-запроса. две таблицы:

1st: created patient table                        2nd: already created doc table
     patientid  patientname  docid  workstatus          docid  docname
      1          aaa          2          10               1      ggg
      2          bbb          2          20               2      hhh
      3          ccc          1          10               3      iii 
      4          ddd          3          10
      5          eee          3          20
      6          fff          2          10

ожидаемый результат:

docname workstatus(10) workstatus(20)
ggg      1               0
hhh      2               1
iii      1               1

также может использовать временные таблицы между запросами

Заранее спасибо

Answer 1

Попробуйте это

Полный рабочий пример

declare @patient as table(
patientID int IDENTITY(1,1) NOT NULL,
patientName varchar(25),
docID int,
workstatus smallint
)

declare @doc as table(
docID int IDENTITY(1,1) NOT NULL,
docname varchar(25)
)

insert into @patient
select 'aaa', 2, 10
union all
select 'bbb', 2, 20
union all
select 'ccc', 1, 10
union all
select 'ddd', 3, 10
union all
select 'eee', 3, 20
union all
select 'fff', 2, 10


insert into @doc
select 'ggg'
union all
select 'hhh'
union all
select 'iii'

select docname, 
      SUM(case when t1.workstatus = 10 THEN 1 ELSE 0 END) as [workstatus(10)],
      SUM(case when t1.workstatus = 20 THEN 1 ELSE 0 END) as [workstatus(20)] 
    from @patient t1
    inner join @doc t2 on t1.docid=t2.docid
    GROUP BY docname

Answer 2

Select  d.docname, 
        SUM(case when c.workstatus = 10 THEN 1 ELSE 0 END) as [WorkStatus(10)],
        SUM(case when c.workstatus = 20 THEN 1 ELSE 0 END) as [WorkStatus(20)] 
from created_patient_table c
inner join already_created_doc_table d on c.docid=d.docid
group by d.docid,d.docname