[推荐]ORACLE SQL:
经典查询练手(不懂装懂,永世饭桶!)
——通过知识共享树立个人品牌。
本文与大家共同讨论与分享ORACLE SQL的一些常用经典查询,欢迎大家补充,同时你认为有那些经典的也可分享出来。在本文中,对每一个问题,你要是认为有什么更好的解决方法也欢迎你及时提出。交流与分享才能共同进步嘛,感谢!
本文使用的实例表结构与表的数据如下:
scott.emp员工表结构如下:
部门表
-- -----------------------------------------
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
HIREDATEDATEY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
提示:工资 = 薪金 + 佣金
-- ---------------------------------------
DEPTNO NUMBER ( 2 )部门编号
DNAME VARCHAR2 ( 14 )Y部门名称
LOC VARCHAR2 ( 13 )Y地点
scott.emp表的现有数据如下:
EMPNOENAMEJOBMGRHIREDATESALCOMMDEPTNO
----------------------------------------------------------------
7369SMITHCLERK79021980-12-17800.0020
7499ALLENSALESMAN76981981-2-201600.00300.0030
7521WARDSALESMAN76981981-2-221250.00500.0030
7566JONESMANAGER78391981-4-22975.0020
7654MARTINSALESMAN76981981-9-281250.001400.0030
7698BLAKEMANAGER78391981-5-12850.0030
7782CLARKMANAGER78391981-6-92450.0010
7788SCOTTANALYST75661987-4-194000.0020
7839KINGPRESIDENT1981-11-175000.0010
7844TURNERSALESMAN76981981-9-81500.000.0030
7876ADAMSCLERK77881987-5-231100.0020
7900JAMESCLERK76981981-12-3950.0030
7902FORDANALYST75661981-12-33000.0020
7934MILLERCLERK77821982-1-231300.0010
102EricHuDeveloper14552011-5-2615500.0014.0010
104huyongPM14552011-5-2615500.0014.0010
105WANGJINGDeveloper14552011-5-2615500.0014.0010
17rowsselected
Scott.dept表的现有数据如下:
DEPTNODNAMELOC
---------------------------------
10ACCOUNTINGNEWYORK
20RESEARCHDALLAS
30SALESCHICAGO
40OPERATIONSBOSTON
5050abc50def
60DeveloperHaiKou
6rowsselected
用SQL完成以下问题列表:
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。
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 ' );
EMPNOENAMEJOBMGRHIREDATESALCOMMDEPTNO
-- --------------------------------------------------------------
7499 ALLENSALESMAN 7698 1981 - 2 - 20 1600.00 300.00 30
7521 WARDSALESMAN 7698 1981 - 2 - 22 1250.00 500.00 30
7566 JONESMANAGER 7839 1981 - 4 - 2 2975.00 20
7654 MARTINSALESMAN 7698 1981 - 9 - 28 1250.00 1400.00 30
7698 BLAKEMANAGER 7839 1981 - 5 - 1 2850.00 30
7782 CLARKMANAGER 7839 1981 - 6 - 9 2450.00 10
7788 SCOTTANALYST 7566 1987 - 4 - 19 4000.00 20
7839 KINGPRESIDENT 1981 - 11 - 17 5000.00 10
7844 TURNERSALESMAN 7698 1981 - 9 - 8 1500.00 0.00 30
7876 ADAMSCLERK 7788 1987 - 5 - 23 1100.00 20
7900 JAMESCLERK 7698 1981 - 12 - 3 950.00 30
7902 FORDANALYST 7566 1981 - 12 - 3 3000.00 20
7934 MILLERCLERK 7782 1982 - 1 - 23 1300.00 10
102 EricHuDeveloper 1455 2011 - 5 - 26 1 5500.00 14.00 10
104 huyongPM 1455 2011 - 5 - 26 1 5500.00 14.00 10
105 WANGJINGDeveloper 1455 2011 - 5 - 26 1 5500.00 14.00 10
16 rowsselected
-- ------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 empb where b.empno = a.mgr) as boss_name from empa;
ENAMEBOSS_NAME
-- ------------------
SMITHFORD
ALLENBLAKE
WARDBLAKE
JONESKING
MARTINBLAKE
BLAKEKING
CLARKKING
SCOTTJONES
KING
TURNERBLAKE
ADAMSSCOTT
JAMESBLAKE
FORDJONES
MILLERCLARK
EricHu
huyong
WANGJING
17 rowsselected
-- ------4.列出受雇日期早于其直接上级的所有员工。----------
SQL > select a.ename from empa where a.hiredate < ( select hiredate from empb where b.empno = a.mgr);
ENAME
-- --------
SMITH
ALLEN
WARD
JONES
BLAKE
CLARK
6 rowsselected
-- ------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
2 from depta left join empb on a.deptno = b.deptno;
DNAMEEMPNOENAMEJOBMGRHIREDATESALDEPTNO
-- -------------------------------------------------------------------
RESEARCH 7369 SMITHCLERK 7902 1980 - 12 - 17 800.00 20
SALES 7499 ALLENSALESMAN 7698 1981 - 2 - 20 1600.00 30
SALES 7521 WARDSALESMAN 7698 1981 - 2 - 22 1250.00 30
RESEARCH 7566 JONESMANAGER 7839 1981 - 4 - 2 2975.00 20
SALES 7654 MARTINSALESMAN 7698 1981 - 9 - 28 1250.00 30
SALES 7698 BLAKEMANAGER 7839 1981 - 5 - 1 2850.00 30
ACCOUNTING 7782 CLARKMANAGER 7839 1981 - 6 - 9 2450.00 10
RESEARCH 7788 SCOTTANALYST 7566 1987 - 4 - 19 4000.00 20
ACCOUNTING 7839 KINGPRESIDENT 1981 - 11 - 17 5000.00 10
SALES 7844 TURNERSALESMAN 7698 1981 - 9 - 8 1500.00 30
RESEARCH 7876 ADAMSCLERK 7788 1987 - 5 - 23 1100.00 20
SALES 7900 JAMESCLERK 7698 1981 - 12 - 3 950.00 30
RESEARCH 7902 FORDANALYST 7566 1981 - 12 - 3 3000.00 20
ACCOUNTING 7934 MILLERCLERK 7782 1982 - 1 - 23 1300.00 10
ACCOUNTING 102 EricHuDeveloper 1455 2011 - 5 - 26 1 5500.00 10
ACCOUNTING 104 huyongPM 1455 2011 - 5 - 26 1 5500.00 10
ACCOUNTING 105 WANGJINGDeveloper 1455 2011 - 5 - 26 1 5500.00 10
50abc
OPERATIONS
Developer
20 rowsselected
-- ------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 empa join deptb on a.deptno = b.deptno and a.job = ' CLERK ' ;
ENAMEDNAME
-- ----------------------
SMITHRESEARCH
ADAMSRESEARCH
JAMESSALES
MILLERACCOUNTING
-- ------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
6 rowsselected
-- ------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
8 rowsselected
-- ------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 empa where a.sal in ( select b.sal
2 from empb where b.deptno = 30 ) and a.deptno <> 30 ;
ENAMESAL
-- -----------------
-- ------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 );
ENAMESAL
-- -----------------
JONES 2975.00
SCOTT 4000.00
KING 5000.00
FORD 3000.00
EricHu 5500.00
huyong 5500.00
WANGJING 5500.00
7 rowsselected
-- ------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 deptb where a.deptno = b.deptno) as deptname, count (deptno) as deptcount, avg (sal) as deptavgsal
2 from empa group by deptno;
DEPTNAMEDEPTCOUNTDEPTAVGSAL
-- --------------------------------
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 deptb where b.deptno = a.deptno) as deptname,sal from empa;
ENAMEDEPTNAMESAL
-- -------------------------------
SMITHRESEARCH 800.00
ALLENSALES 1600.00
WARDSALES 1250.00
JONESRESEARCH 2975.00
MARTINSALES 1250.00
BLAKESALES 2850.00
CLARKACCOUNTING 2450.00
SCOTTRESEARCH 4000.00
KINGACCOUNTING 5000.00
TURNERSALES 1500.00
ADAMSRESEARCH 1100.00
JAMESSALES 950.00
FORDRESEARCH 3000.00
MILLERACCOUNTING 1300.00
EricHuACCOUNTING 5500.00
huyongACCOUNTING 5500.00
WANGJINGACCOUNTING 5500.00
17 rowsselected
-- ------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 empb where b.deptno = a.deptno group by b.deptno) as deptcount from depta;
DEPTNODNAMELOCDEPTCOUNT
-- -----------------------------------------
10 ACCOUNTINGNEWYORK 6
20 RESEARCHDALLAS 5
30 SALESCHICAGO 6
40 OPERATIONSBOSTON
50 50abc50def
60 DeveloperHaiKou
6 rowsselected
-- ------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
7 rowsselected
-- ------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)
-- --------------
10 2450
20 2975
30 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;
ENAMESALPERSAL
-- ------------------
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
17 rowsselected
© 2011 EricHu
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作者:EricHu(DB、C/S、B/S、WebService、WCF、PM等)
出处:http://www.cnblogs.com/huyong/
Q Q:80368704 E-Mail: 80368704@qq.com
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