The same point: they are to a department table (or categories table), other tables have the department number DepartmentID (category number)
Case I: A table
select c.DepartmentID,c.DepartmentName, t.Num AS '人员数量' from T_Department as c
left join (select DepartmentID,COUNT(*) AS Num from T_User group by DepartmentID) as t on c.DepartmentID= t.DepartmentID
The core idea is: Split
Table 1 The personnel department number by the number of statistics: (select DepartmentID, COUNT (*) AS Num from T_User group by CompanyID) to give t: department number, the number of department staff;
The department table with 2 t, department number in accordance with the table left connected, get: name of the department, the number of departments
Case II: multiple tables
Investigators statistics submitted, equipment, specifications, data source specifications table number
I was beginning to do so:
select c.CompanyName, t.Num from T_Company as c left join (select CompanyID,COUNT(*) AS Num from T_Standard as s where s.HasSubmitted=1 group by CompanyID) as t on c.CompanyID= t.CompanyID order by c.CompanyID
select c.CompanyName, t.Num from T_Company as c left join (select CompanyID,COUNT(*) AS Num from T_Investigator as s where s.HasSubmitted=1 group by CompanyID) as t on c.CompanyID= t.CompanyID order by c.CompanyID
select c.CompanyName, t.Num from T_Company as c left join (select CompanyID,COUNT(*) AS Num from T_Machine as s where s.HasSubmitted=1 group by CompanyID) as t on c.CompanyID= t.CompanyID order by c.CompanyID
select c.CompanyName, t.Num from T_Company as c left join (select CompanyID,COUNT(*) AS Num from T_DataSource as s where s.HasSubmitted=1 group by CompanyID) as t on c.CompanyID= t.CompanyID order by c.CompanyID
However, Excel and copied to a one by one.
后来我是这样的：
select c.CompanyID,c.CompanyName, t1.Num AS '调查人员数量',t2.Num AS '设备数量',t.Num AS '规范数量',t3.Num AS '数据来源规范数量' from T_Company as c
left join (select CompanyID,COUNT(*) AS Num from T_Standard as s where s.HasSubmitted=1 group by CompanyID) as t on c.CompanyID= t.CompanyID
left join (select CompanyID,COUNT(*) AS Num from T_Investigator as s where s.HasSubmitted=1 group by CompanyID) as t1 on c.CompanyID= t1.CompanyID
left join (select CompanyID,COUNT(*) AS Num from T_Machine as s where s.HasSubmitted=1 group by CompanyID) as t2 on c.CompanyID= t2.CompanyID
left join (select CompanyID,COUNT(*) AS Num from T_DataSource as s where s.HasSubmitted=1 group by CompanyID) as t3 on c.CompanyID= t3.CompanyID
order by c.CompanyID
The last assignment paste it into Excel, put forward in Excel Total:
