加入多个表后计数和多个列值的计数

Question

请帮我解决以下问题。

table 1 名员工详细信息

emp name          empno.
---------------------------------
John               1234

Joe                6789

table 2 员工分配

empno  assignmentstartdate assignmentenddate assignmentID  empassignmentID
-----------------------------------------------------------------------------
1234      01JAN2017            02JAN2017         A1            X1

6789      01jan2017            02JAN2017         B1            Z1

table 3 员工分配属性

empassignmentID   assignmentID  propertyname        propertyvalue
-------------------------------------------------------------------
X1                  A1           COMPLETED           true

X1                  A1           STARTED             true

Z1                  B1           STARTED             true

Z1                  B1           COMPLETED           false

想要的结果：（每个员工完成和开始的计数）

emp name   emp no.  COMPLETED   STARTED
------------------------------------------
John       1234      1           1

Joe        6789      0           1

目前我的查询没有正确计算属性值，如果我运行一个员工工作正常但多个员工不工作。请帮忙。

 SELECT empno ,
  empname     ,
 (SELECT COUNT(A.propertyvalue)
 FROM employeedetails C ,
 employees_ASSIGNMENT RCA,
 employee_assignment_property A
 WHERE TRUNC(startdate) >= '14jun2017'
 AND TRUNC(endate)        <= '20jun2017'
 AND RCA.empno             = C.empno
 AND RCA.empassignmetid    = A.empassignmetid
 AND rca.EMPNO            IN ('1234','6789')
  AND RCA.assignmentid      = A.assignmentid
  AND A.Name                = 'COMPLETED'
  AND A.propertyvalue       = 'true') ,
  (SELECT COUNT(A.propertyvalue)
   FROM employeedetails C ,
   employees_ASSIGNMENT RCA,
  employee_assignment_property A
  WHERE TRUNC(startdate) >= '14jun2017'
  AND TRUNC(endate)        <= '20jun2017'
  AND RCA.empno             = C.empno
  AND RCA.empassignmetid    = A.empassignmetid
 AND rca.EMPNO            IN ('1234','6789')
 AND RCA.assignmentid      = A.assignmentid
 AND A.Name                = 'STARTED'
 AND A.propertyvalue       = 'true')FROM employeedetails  WHERE EMPNO IN 
 ('1234','6789') GROUP BY C.empno ,
  C.EMPNAME

Answer 1

如果你不想做一个由子查询组成的脏查询，你可以尝试创建一个view（如果你的数据库允许的话）。

什么意思：在this面前我就没用了。总之，视图是临时的table.

希望对您有所帮助

Answer 2

这应该可以使用 CTE： Using Common Table Expressions

with numComplet()
as 
(
select tbl1.empNo, count(tbl2.assId) 
from tbl1 
join tbl2 on (tbl1.empno = tbl2.empno)
join tbl3 on (tbl2.assId = tbl3.assId)
where tbl2.ptop = 'COMPLETED'
group by tbl1.empNo
),


with numStarted()
as 
(
select tbl1.empNo, count(tbl2.assId) 
from tbl1 
join tbl2 on (tbl1.empno = tbl2.empno)
join tbl3 on (tbl2.assId = tbl3.assId)
where tbl2.ptop = 'STARTED'
group by tbl1.empNo
)

select * 
from tbl1 
join numComplet on (tbl1.empNo = numComplet.empNo)
join numStarted on (tbl1.empNo = numStarted.empNo)

我把 table 个名字记为 tbl[1|2|3]

Answer 3

如果您希望结果是没有 CTE 的查询，这应该可行：

  select empName,
       empNo,   
        (select employee_details.empNo, count(employee_assignment.assId) 
        from employee_details as t1
        join employee_assignment on (t1.empno = employee_assignment.empno)
        join employee_assignment_property on (employee_assignment.assId = employee_assignment_property.assId)
        where employee_assignment.ptop = 'COMPLETED'
                and t.empNo = t1.empNo
        group by t1.empNo ) as [COMPLETED],

        (select employee_details.empNo, count(employee_assignment.assId) 
        from employee_details as t1
        join employee_assignment on (t1.empno = employee_assignment.empno)
        join employee_assignment_property on (employee_assignment.assId = employee_assignment_property.assId)
        where employee_assignment.ptop = 'STARTED'
                and t.empNo = t1.empNo
        group by t1.empNo ) as [STARTED],       
from employee_details as t

Answer 4

我想你只是在找这个：

SELECT      DET.empname     
,           COUNT(CASE WHEN PROP.propertyname = 'COMPLETED' THEN 1 END) COMP_COUNT
,           COUNT(CASE WHEN PROP.propertyname = 'STARTED' THEN 1 END) START_COUNT
FROM        employeedetails DET
INNER JOIN  employees_ASSIGNMENT ASS
        ON  ASS.empno = DET.empno
INNER JOIN  employee_assignment_property PROP
        ON  PROP.empassignmentID = ASS.empassignmentID   
        AND PROP.assignmentID  = ASS.assignmentID
GROUP BY    DET.empname

如果需要，只需添加一个 WHERE 子句。

加入多个表后计数和多个列值的计数

count after join on multiple tables and count of multiple column values

sql

oracle12c