GROUP BY帶有具體列名的SQL

Question

例如，具有表名稱部門

//DEPARTMENT 
D# 
-------- 
1 
2 
3 

現在有一個項目表

//Project 
P#  D# 
----------- 
1  1 
2  1 
3  2 
4  1 

所以，我應該如何通過帶有具體列名時，顯示使用組i使用提示所有的信息，它應該是類似的

Enter Department Number : 1 

D#  total project 
--------------------- 
1   3 

到目前爲止我做了這樣的

ACCEPT dno PROMPT 'Enter Department Number: ' 
SELECT DNAME FROM DEPARTMENT WHERE D#=&dno; 
SELECT count(*) from PROJECT where D#=&dno; 

Answer 1

使用本

select DNAME, count(Project) AS "total project" FROM DEPARTMENT d, PROJECT p 
WHERE d.dno=p.dno and D.DNO=&dno group by DNAME; 

獲得總共只

select count(Project) AS "total project" FROM DEPARTMENT d, PROJECT p 
WHERE d.dno=p.dno and D.DNO=&dno group by DNAME; 

Answer 2

要做兩個表之間的連接，

ACCEPT dno PROMPT 'Enter Department Number: ' 
SELECT DNAME, count(*) 
    FROM DEPARTMENT d, PROJECT p 
    WHERE d.dno=p.dno and d.dno=&dno 
    group by d.DNAME; 

編輯

顯示dno和DNAME與項目

ACCEPT dno PROMPT 'Enter Department Number: ' 
SELECT d.dno,DNAME, count(*) as 'total' 
    FROM DEPARTMENT d, PROJECT p 
    WHERE d.dno=p.dno and d.dno=&dno 
    group by d.dno,DNAME;