Oracle SQL：经典查询练手四篇
--------10．列出与“SCOTT”从事相同工作的所有员工。--------
SQL> select ename from emp where job=(select job from emp where ename='SCOTT');
ENAME
----------
SCOTT
FORD
--------11．列出薪金等于部门30中员工的薪金的所有员工的姓名和薪金。---------
SQL> select a.ename,a.sal from emp a where a.sal in (select b.sal
2 from emp b where b.deptno=30) and a.deptno<>30;
ENAME SAL
---------- ---------
--------12．列出薪金高于在部门30工作的所有员工的薪金的员工姓名和薪金。---------
SQL> select ename,sal from emp where sal>(select max(sal) from emp where deptno=30);
ENAME SAL
---------- ---------
JONES 2975.00
SCOTT 4000.00
KING 5000.00
FORD 3000.00
EricHu 5500.00
huyong 5500.00
WANGJING 5500.00
7 rows selected
--------13．列出在每个部门工作的员工数量、平均工资和平均服务期限。---------
SQL> select (select b.dname from dept b where a.deptno=b.deptno) as deptname ,count(deptno) as deptcount,avg(sal) as deptavgsal
2 from emp a group by deptno;
DEPTNAME DEPTCOUNT DEPTAVGSAL
-------------- ---------- ----------
ACCOUNTING 6 4208.33333
RESEARCH 5 2375
SALES 6 1566.66666
SQL> select ename from emp where job=(select job from emp where ename='SCOTT');
ENAME
----------
SCOTT
FORD
--------11．列出薪金等于部门30中员工的薪金的所有员工的姓名和薪金。---------
SQL> select a.ename,a.sal from emp a where a.sal in (select b.sal
2 from emp b where b.deptno=30) and a.deptno<>30;
ENAME SAL
---------- ---------
--------12．列出薪金高于在部门30工作的所有员工的薪金的员工姓名和薪金。---------
SQL> select ename,sal from emp where sal>(select max(sal) from emp where deptno=30);
ENAME SAL
---------- ---------
JONES 2975.00
SCOTT 4000.00
KING 5000.00
FORD 3000.00
EricHu 5500.00
huyong 5500.00
WANGJING 5500.00
7 rows selected
--------13．列出在每个部门工作的员工数量、平均工资和平均服务期限。---------
SQL> select (select b.dname from dept b where a.deptno=b.deptno) as deptname ,count(deptno) as deptcount,avg(sal) as deptavgsal
2 from emp a group by deptno;
DEPTNAME DEPTCOUNT DEPTAVGSAL
-------------- ---------- ----------
ACCOUNTING 6 4208.33333
RESEARCH 5 2375
SALES 6 1566.66666
--------14．列出所有员工的姓名、部门名称和工资。---------
SQL> select a.ename,(select b.dname from dept b where b.deptno=a.deptno) as deptname,sal from emp a;
ENAME DEPTNAME SAL
---------- -------------- ---------
SMITH RESEARCH 800.00
ALLEN SALES 1600.00
WARD SALES 1250.00
JONES RESEARCH 2975.00
MARTIN SALES 1250.00
BLAKE SALES 2850.00
CLARK ACCOUNTING 2450.00
SCOTT RESEARCH 4000.00
KING ACCOUNTING 5000.00
TURNER SALES 1500.00
ADAMS RESEARCH 1100.00
JAMES SALES 950.00
FORD RESEARCH 3000.00
MILLER ACCOUNTING 1300.00
EricHu ACCOUNTING 5500.00
huyong ACCOUNTING 5500.00
WANGJING ACCOUNTING 5500.00
17 rows selected
--------15．列出所有部门的详细信息和部门人数。---------
SQL> select a.deptno,a.dname,a.loc,(select count(deptno) from emp b where b.deptno=a.deptno group by b.deptno) as deptcount from dept a;
DEPTNO DNAME LOC DEPTCOUNT
------ -------------- ------------- ----------
10 ACCOUNTING NEW YORK 6
20 RESEARCH DALLAS 5
30 SALES CHICAGO 6
40 OPERATIONS BOSTON
50 50abc 50def
60 Developer HaiKou
6 rows selected
SQL> select a.ename,(select b.dname from dept b where b.deptno=a.deptno) as deptname,sal from emp a;
ENAME DEPTNAME SAL
---------- -------------- ---------
SMITH RESEARCH 800.00
ALLEN SALES 1600.00
WARD SALES 1250.00
JONES RESEARCH 2975.00
MARTIN SALES 1250.00
BLAKE SALES 2850.00
CLARK ACCOUNTING 2450.00
SCOTT RESEARCH 4000.00
KING ACCOUNTING 5000.00
TURNER SALES 1500.00
ADAMS RESEARCH 1100.00
JAMES SALES 950.00
FORD RESEARCH 3000.00
MILLER ACCOUNTING 1300.00
EricHu ACCOUNTING 5500.00
huyong ACCOUNTING 5500.00
WANGJING ACCOUNTING 5500.00
17 rows selected
--------15．列出所有部门的详细信息和部门人数。---------
SQL> select a.deptno,a.dname,a.loc,(select count(deptno) from emp b where b.deptno=a.deptno group by b.deptno) as deptcount from dept a;
DEPTNO DNAME LOC DEPTCOUNT
------ -------------- ------------- ----------
10 ACCOUNTING NEW YORK 6
20 RESEARCH DALLAS 5
30 SALES CHICAGO 6
40 OPERATIONS BOSTON
50 50abc 50def
60 Developer HaiKou
6 rows selected
0
第1页：经典查询练手第一篇：结构与表第2页：经典查询练手第一篇：解答方法(1)第3页：经典查询练手第一篇：解答方法(2)第4页：经典查询练手第一篇：解答方法(3)第5页：经典查询练手第二篇：结构与表第6页：经典查询练手第二篇：表的现有数据第7页：经典查询练手第二篇：解答方法(1)第8页：经典查询练手第二篇：解答方法(2)第9页：经典查询练手第三篇：表和结构第10页：经典查询练手第三篇：解答方法(1)第11页：经典查询练手第三篇：解答方法(2)第12页：经典查询练手第三篇：解答方法(3)第13页：经典查询练手第三篇：解答方法(4)第14页：经典查询练手第三篇：解答方法(5)第15页：经典查询练手第四篇：表和结构第16页：经典查询练手第四篇：ER图及问题第17页：经典查询练手第四篇：解答方法(1)第18页：经典查询练手第四篇：解答方法(2)第19页：经典查询练手第四篇：解答方法(3)
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