4

このクエリに問題があります。誰がどの医師に Max 料金を支払ったかを確認したいのですが? tblPatient、tblClinic、tblDoctor の 3 つのテーブル名を作成しました。tblClinic テーブルの PID 列と DID 列に外部キーを設定しました。このクエリで何ができるので、必要な結果が得られます。

create database Hospital
use Hospital

create table tblPatient
(
PID int identity(100,1) primary key not null,
PName varchar(20),
PPhone varchar(20)
)

create table tblClinic
(
CID int identity(300,1) primary key not null,
PID int,
DID int,
Fees int,
foreign key(PID) references tblPatient(PID),
foreign key(DID) references tblDoctor(DID)
)

create table tblDoctor
(
DID int identity(200,1) primary key not null,
DName varchar(20),
DPhone varchar(20),
)

insert into tblPatient values('Zeeshan',033314785)
insert into tblPatient values('Mufaddil',034521548)
insert into tblPatient values('Shayan',033236981)
insert into tblPatient values('Zahid',0334425632)
insert into tblPatient values('Afzaal',030178945)
insert into tblClinic values (100,201,1500)
insert into tblClinic values (102,202,1600)
insert into tblClinic values (103,204,700)
insert into tblClinic values (101,201,800)
insert into tblClinic values (101,200,600)
insert into tblClinic values (103,202,650)
insert into tblClinic values (104,202,550)
insert into tblClinic values (102,203,840)
insert into tblClinic values (101,203,2000)
insert into tblClinic values (100,204,250)
insert into tblClinic values (100,201,1700)
insert into tblClinic values (101,202,1650)
insert into tblClinic values (104,204,300)
insert into tblDoctor values ('Dr.Amir',033412345)
insert into tblDoctor values ('Dr.Bilal',034554125)
insert into tblDoctor values ('Dr.Saim',033358741)
insert into tblDoctor values ('Dr.Rizwan',033325871)
insert into tblDoctor values ('Dr.Kamran',030025874)

select * from tblPatient
select * from tblClinic
select * from tblDoctor

select p.PName,d.DName
from tblPatient p
inner join
tblClinic c
ON p.PID=c.PID
inner join
tblDoctor d
ON d.DID=c.DID
where PName in ('Zeeshan','Shayan','Afzaal')

select d.DName,p.PName
from tblDoctor d
inner join
tblClinic c
ON d.DID=c.DID
inner join
tblPatient p
ON p.PID=c.PID
where d.DName in ('Dr.Bilal','Dr.Kamran','Dr.Amir')
order by d.DName,p.PName asc

select d.DName,p.PName,c.Fees
from tblDoctor d
inner join
tblClinic c
ON d.DID=c.DID
inner join
tblPatient p
ON p.PID=c.PID
where d.DName in ('Dr.Bilal','Dr.Kamran','Dr.Amir')
order by d.DName,p.PName asc
4

2 に答える 2

16

If you want to find which patient has paid the maximum fee for each of the doctors, this query should do:

SELECT P.PName, D.DName, C.Fees
FROM tblClinic C
INNER JOIN tblPatient P ON P.PID = C.PID
INNER JOIN tblDoctor D ON D.DID = C.DID
WHERE C.Fees =
(SELECT max(Fees) FROM tblClinic C2
WHERE C2.DID = C.DID)
于 2012-12-16T10:33:06.370 に答える
4

これを試して。ここにあなたのデータからの実例があります

select pname,dname, fee 
from (
   select pname, dname, max(fees) fee, 
          rank() over (order by p.pname) rk, 
          row_number() over (order by p.pname,max(fees) desc) rn
   from tblClinic c join tblPatient p on c.pid = p.pid
                 join tblDoctor d on c.did = d.did
   group by pname,dname
  ) T
where rk = rn

結果

Afzaal      Dr.Saim         550
Mufaddil    Dr.Rizwan       2000
Shayan      Dr.Saim         1600
Zahid       Dr.Kamran       700
Zeeshan     Dr.Bilal        1700
于 2012-12-16T10:58:25.917 に答える