Oracle數(shù)據(jù)庫中代碼是數(shù)據(jù)庫運行的基礎(chǔ)，也是最基本的，下文中涉及到的Oracle數(shù)據(jù)庫的代碼對于剛剛?cè)腴T的初學者來說是非常有價值的，希望對大家能夠有所幫助。

求部門中哪些人的薪水***

以下是代碼片段：select ename,sal from emp join (select max(sal) max_sal, deptno from emp group by deptno) t on (emp.sal = t.max_sal and emp.deptno = t.deptno); -

求部門平均薪水的等級

以下是代碼片段：select deptno,avg_sal,grade from (select deptno,avg(sal) avg_sal from emp group by deptno) t join salgrade s on (t.avg_sal between s.losal and s.hisal);

求部門平均的薪水等級

以下是代碼片段：select deptno,avg(grade) from (select deptno,ename,grade from emp join salgrade s on (emp.sal between s.losal and s.hisal)) t group by deptno;

雇員中哪些人是經(jīng)理人

以下是代碼片段：select ename from emp where empno in (select distinct mgr from emp);

不用組函數(shù)，求薪水的***值

以下是代碼片段：select sal from emp where sal not in (select distinct e1.sal from emp e1 join emp e2 on (e1.sal < e2.sal))

用組函數(shù)，求薪水的***值

以下是代碼片段：

select max(sal) from emp；

求平均薪水***的部門的部門編號

以下是代碼片段：select deptno , avg_sal from (select avg(sal) avg_sal,deptno from emp group by deptno) t where avg_sal = (select max(avg_sal) from (select avg(sal) avg_sal,deptno from emp group by deptno) t)；

組函數(shù)嵌套的寫法

以下是代碼片段：select deptno , avg_sal from (select avg(sal) avg_sal,deptno from emp group by deptno) t where avg_sal = (select max(avg(sal)) from emp group by deptno)；

求平均薪水***的部門的名稱

以下是代碼片段：select dname from dept where deptno = ( select deptno from (select avg(sal) avg_sal,deptno from emp group by deptno) t where avg_sal = (select max(avg_sal) from (select avg(sal) avg_sal,deptno from emp group by deptno) t) )；

求平均薪水的等級***的部門的部門名稱

以下是代碼片段：select avg(sal) avg_sal,deptno from emp group by deptno

部門平均薪水

以下是代碼片段：select min(avg_sal) from ( select avg(sal) avg_sal,deptno from emp group by deptno )

平均工資的最小值

以下是代碼片段：select avg_sal,deptno from (select avg(sal) avg_sal,deptno from emp group by deptno) t where avg_sal = ( select min(avg_sal) from ( select avg(sal) avg_sal,deptno from emp group by deptno ) )

平均工資的最小值及部門編號

以下是代碼片段：select t.avg_sal,t.deptno,s.grade from (select avg(sal) avg_sal,deptno from emp group by deptno) t join salgrade s on (t.avg_sal between s.losal and s.hisal) where avg_sal = ( select min(avg_sal) from ( select avg(sal) avg_sal,deptno from emp group by deptno ) )

平均工資的最小值及部門編號和工資等級

以下是代碼片段：select d.dname,t.avg_sal,t.deptno,s.grade from (select avg(sal) avg_sal,deptno from emp group by deptno) t join salgrade s on (t.avg_sal between s.losal and s.hisal) join dept d on (t.deptno = d.deptno) where avg_sal = ( select min(avg_sal) from ( select avg(sal) avg_sal,deptno from emp group by deptno ) )

平均工資的最小值及部門編號和工資等級及部門名稱

Another 按照題意的寫法

以下是代碼片段：select t1.deptno,t1.avg_sal,grade,d.dname from ( select deptno,avg_sal,grade from (select deptno,avg(sal) avg_sal from emp group by deptno) t join salgrade s on (t.avg_sal between s.losal and s.hisal) ) t1 join dept d on (t1.deptno = d.deptno) where grade = ( select min(grade) from ( select deptno,avg_sal,grade from (select deptno,avg(sal) avg_sal from emp group by deptno) t join salgrade s on (t.avg_sal between s.losal and s.hisal) ) );

創(chuàng)建視圖或者表，如果沒有權(quán)限

以下是代碼片段：conn sys/sys as sysdba;

已連接。

以下是代碼片段：grant create table, create view to scott;

本文就為大家介紹這么多，這只是其中的一小部分，還有很多這里沒有介紹到，以后還會繼續(xù)為大家介紹更多的知識，希望能夠幫助到大家。