ORACLE SQL：经典查询练手第一篇(不懂装懂，永世饭桶！)

scott.emp员工表结构如下：

Name     Type         Nullable Default Comments 
-------- ------------ -------- ------- -------- 
EMPNO    NUMBER(4)                       员工号       
ENAME    VARCHAR2(10) Y                  员工姓名       
JOB      VARCHAR2(9)  Y                  工作       
MGR      NUMBER(4)    Y                  上级编号       
HIREDATE DATE         Y                  雇佣日期       
SAL      NUMBER(7,2)  Y                  薪金       
COMM     NUMBER(7,2)  Y                  佣金       
DEPTNO   NUMBER(2)    Y                  部门编号

scott.dept部门表

Name   Type         Nullable Default Comments 
------ ------------ -------- ------- -------- 
DEPTNO NUMBER(2)                         部门编号        
DNAME  VARCHAR2(14) Y                    部门名称     
LOC    VARCHAR2(13) Y                    地点

提示：工资＝薪金＋佣金

scott.emp表的现有数据如下：

SQL> select * from emp;
 
EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
SMITH      CLERK      7902 1980-12-17     800.00               20
ALLEN      SALESMAN   7698 1981-2-20     1600.00    300.00     30
WARD       SALESMAN   7698 1981-2-22     1250.00    500.00     30
JONES      MANAGER    7839 1981-4-2      2975.00               20
MARTIN     SALESMAN   7698 1981-9-28     1250.00   1400.00     30
BLAKE      MANAGER    7839 1981-5-1      2850.00               30
CLARK      MANAGER    7839 1981-6-9      2450.00               10
SCOTT      ANALYST    7566 1987-4-19     4000.00               20
KING       PRESIDENT       1981-11-17    5000.00               10
TURNER     SALESMAN   7698 1981-9-8      1500.00      0.00     30
ADAMS      CLERK      7788 1987-5-23     1100.00               20
JAMES      CLERK      7698 1981-12-3      950.00               30
FORD       ANALYST    7566 1981-12-3     3000.00               20
MILLER     CLERK      7782 1982-1-23     1300.00               10
EricHu     Developer  1455 2011-5-26 1   5500.00     14.00     10
huyong     PM         1455 2011-5-26 1   5500.00     14.00     10
WANGJING   Developer  1455 2011-5-26 1   5500.00     14.00     10
rows selected

Scott.dept表的现有数据如下：

SQL> select * from dept;
 
DEPTNO DNAME          LOC
------ -------------- -------------
ACCOUNTING     NEW YORK
RESEARCH       DALLAS
SALES          CHICAGO
OPERATIONS     BOSTON
50abc          50def
Developer      HaiKou
rows selected

用SQL完成以下问题列表：

1．列出至少有一个员工的所有部门。
2．列出薪金比“SMITH”多的所有员工。
3．列出所有员工的姓名及其直接上级的姓名。
4．列出受雇日期早于其直接上级的所有员工。
5．列出部门名称和这些部门的员工信息，同时列出那些没有员工的部门
6．列出所有“CLERK”（办事员）的姓名及其部门名称。
7．列出最低薪金大于1500的各种工作。
8．列出在部门“SALES”（销售部）工作的员工的姓名，假定不知道销售部的部门编号。
9．列出薪金高于公司平均薪金的所有员工。
10．列出与“SCOTT”从事相同工作的所有员工。
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。
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。
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。
14．列出所有员工的姓名、部门名称和工资。
15．列出所有部门的详细信息和部门人数。
16．列出各种工作的最低工资。
17．列出各个部门的MANAGER（经理）的最低薪金。
18．列出所有员工的年工资,按年薪从低到高排序。

各答案如下，欢迎大家给出不出的解答方式。

--------1．列出至少有一个员工的所有部门。---------
SQL> select dname from dept where deptno in(select deptno from emp); 
DNAME
--------------
RESEARCH
SALES
ACCOUNTING
--------或--------
SQL> select dname from dept where deptno in(select deptno from emp group by deptno having count(deptno) >=1); 
DNAME
--------------
ACCOUNTING
RESEARCH
SALES

--------2．列出薪金比“SMITH”多的所有员工。----------
SQL> select * from emp where sal > (select sal from emp where ename = 'SMITH');
 
EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
ALLEN      SALESMAN   7698 1981-2-20     1600.00    300.00     30
WARD       SALESMAN   7698 1981-2-22     1250.00    500.00     30
JONES      MANAGER    7839 1981-4-2      2975.00               20
MARTIN     SALESMAN   7698 1981-9-28     1250.00   1400.00     30
BLAKE      MANAGER    7839 1981-5-1      2850.00               30
CLARK      MANAGER    7839 1981-6-9      2450.00               10
SCOTT      ANALYST    7566 1987-4-19     4000.00               20
KING       PRESIDENT       1981-11-17    5000.00               10
TURNER     SALESMAN   7698 1981-9-8      1500.00      0.00     30
ADAMS      CLERK      7788 1987-5-23     1100.00               20
JAMES      CLERK      7698 1981-12-3      950.00               30
FORD       ANALYST    7566 1981-12-3     3000.00               20
MILLER     CLERK      7782 1982-1-23     1300.00               10
EricHu     Developer  1455 2011-5-26 1   5500.00     14.00     10
huyong     PM         1455 2011-5-26 1   5500.00     14.00     10
WANGJING   Developer  1455 2011-5-26 1   5500.00     14.00     10
rows selected

--------3．列出所有员工的姓名及其直接上级的姓名。----------
SQL> select a.ename,(select ename from emp b where b.empno=a.mgr) as boss_name from emp a; 
ENAME      BOSS_NAME
---------- ----------
SMITH      FORD
ALLEN      BLAKE
WARD       BLAKE
JONES      KING
MARTIN     BLAKE
BLAKE      KING
CLARK      KING
SCOTT      JONES
KING       
TURNER     BLAKE
ADAMS      SCOTT
JAMES      BLAKE
FORD       JONES
MILLER     CLARK
EricHu     
huyong     
WANGJING    
rows selected

--------4．列出受雇日期早于其直接上级的所有员工。----------
SQL> select a.ename from emp a where a.hiredate<(select hiredate from emp b where b.empno=a.mgr); 
ENAME
----------
SMITH
ALLEN
WARD
JONES
BLAKE
CLARK 
rows selected

--------5．列出部门名称和这些部门的员工信息，同时列出那些没有员工的部门----------
SQL> select a.dname,b.empno,b.ename,b.job,b.mgr,b.hiredate,b.sal,b.deptno
 from dept a left join emp b on a.deptno=b.deptno;
 
DNAME          EMPNO ENAME      JOB         MGR HIREDATE          SAL DEPTNO
-------------- ----- ---------- --------- ----- ----------- --------- ------
RESEARCH        7369 SMITH      CLERK      7902 1980-12-17     800.00     20
SALES           7499 ALLEN      SALESMAN   7698 1981-2-20     1600.00     30
SALES           7521 WARD       SALESMAN   7698 1981-2-22     1250.00     30
RESEARCH        7566 JONES      MANAGER    7839 1981-4-2      2975.00     20
SALES           7654 MARTIN     SALESMAN   7698 1981-9-28     1250.00     30
SALES           7698 BLAKE      MANAGER    7839 1981-5-1      2850.00     30
ACCOUNTING      7782 CLARK      MANAGER    7839 1981-6-9      2450.00     10
RESEARCH        7788 SCOTT      ANALYST    7566 1987-4-19     4000.00     20
ACCOUNTING      7839 KING       PRESIDENT       1981-11-17    5000.00     10
SALES           7844 TURNER     SALESMAN   7698 1981-9-8      1500.00     30
RESEARCH        7876 ADAMS      CLERK      7788 1987-5-23     1100.00     20
SALES           7900 JAMES      CLERK      7698 1981-12-3      950.00     30
RESEARCH        7902 FORD       ANALYST    7566 1981-12-3     3000.00     20
ACCOUNTING      7934 MILLER     CLERK      7782 1982-1-23     1300.00     10
ACCOUNTING       102 EricHu     Developer  1455 2011-5-26 1   5500.00     10
ACCOUNTING       104 huyong     PM         1455 2011-5-26 1   5500.00     10
ACCOUNTING       105 WANGJING   Developer  1455 2011-5-26 1   5500.00     10
50abc                                                                 
OPERATIONS                                                            
Developer                                                          
rows selected

--------6．列出所有“CLERK”（办事员）的姓名及其部门名称。----------
SQL> select a.ename,b.dname from emp a join dept b on a.deptno=b.deptno and a.job='CLERK'; 
ENAME      DNAME
---------- --------------
SMITH      RESEARCH
ADAMS      RESEARCH
JAMES      SALES
MILLER     ACCOUNTING

--------7．列出最低薪金大于1500的各种工作。----------
SQL> select distinct job as HighSalJob from emp group by job having min(sal)>1500; 
HIGHSALJOB
----------
ANALYST
Developer
MANAGER
PM
PRESIDENT

--------8．列出在部门“SALES”（销售部）工作的员工的姓名，假定不知道销售部的部门编号。----------
SQL> select ename from emp where deptno=(select deptno from dept where dname='SALES'); 
ENAME
----------
ALLEN
WARD
MARTIN
BLAKE
TURNER
JAMES 
rows selected

--------9．列出薪金高于公司平均薪金的所有员工。----------
SQL> select ename from emp where sal>(select avg(sal) from emp); 
ENAME
----------
JONES
BLAKE
SCOTT
KING
FORD
EricHu
huyong
WANGJING 
rows selected

--------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
 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 
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
 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
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
------ -------------- ------------- ----------
ACCOUNTING     NEW YORK               6
RESEARCH       DALLAS                 5
SALES          CHICAGO                6
OPERATIONS     BOSTON        
50abc          50def         
Developer      HaiKou     
rows selected

--------16．列出各种工作的最低工资。---------
SQL> select job,avg(sal) from emp group by job;
 
JOB         AVG(SAL)
--------- ----------
ANALYST         3500
CLERK         1037.5
Developer       5500
MANAGER   2758.33333
PM              5500
PRESIDENT       5000
SALESMAN        1400
rows selected

--------17．列出各个部门的MANAGER（经理）的最低薪金。--------
SQL> select deptno,min(sal) from emp where job='MANAGER' group by deptno;
 
DEPTNO   MIN(SAL)
------ ----------
      2450
      2975
      2850

--------18．列出所有员工的年工资,按年薪从低到高排序。---------
SQL> select ename,(sal+nvl(comm,0))*12 as salpersal from emp order by salpersal;
 
ENAME       SALPERSAL
---------- ----------
SMITH            9600
JAMES           11400
ADAMS           13200
MILLER          15600
TURNER          18000
WARD            21000
ALLEN           22800
CLARK           29400
MARTIN          31800
BLAKE           34200
JONES           35700
FORD            36000
SCOTT           48000
KING            60000
EricHu          66168
huyong          66168
WANGJING        66168
rows selected

ORACLE SQL： 经典查询练手第一篇(不懂装懂，永世饭桶！)

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ORACLE SQL：经典查询练手第一篇(不懂装懂，永世饭桶！)

你可能感兴趣的:(ORACLE SQL：经典查询练手第一篇(不懂装懂，永世饭桶！))