ORACLE|ORACLE SQL（经典查询练手第一篇(不懂装懂，永世饭桶！)） ORACLESQL：经典查询练手第一篇

scott.emp员工表结构如下：

NameTypeNullable Default Comments -------- ------------ -------- ------- -------- EMPNONUMBER(4)员工号 ENAMEVARCHAR2(10) Y员工姓名 JOBVARCHAR2(9)Y工作 MGRNUMBER(4)Y上级编号 HIREDATE DATEY雇佣日期 SALNUMBER(7,2)Y薪金 COMMNUMBER(7,2)Y佣金 DEPTNONUMBER(2)Y部门编号

scott.dept部门表

NameTypeNullable Default Comments ------ ------------ -------- ------- -------- DEPTNO NUMBER(2)部门编号 DNAMEVARCHAR2(14) Y部门名称 LOCVARCHAR2(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 ENAMEJOBMGR HIREDATESALCOMM DEPTNO ----- ---------- --------- ----- ----------- --------- --------- ------ SMITHCLERK7902 1980-12-17800.0020 ALLENSALESMAN7698 1981-2-201600.00300.0030 WARDSALESMAN7698 1981-2-221250.00500.0030 JONESMANAGER7839 1981-4-22975.0020 MARTINSALESMAN7698 1981-9-281250.001400.0030 BLAKEMANAGER7839 1981-5-12850.0030 CLARKMANAGER7839 1981-6-92450.0010 SCOTTANALYST7566 1987-4-194000.0020 KINGPRESIDENT1981-11-175000.0010 TURNERSALESMAN7698 1981-9-81500.000.0030 ADAMSCLERK7788 1987-5-231100.0020 JAMESCLERK7698 1981-12-3950.0030 FORDANALYST7566 1981-12-33000.0020 MILLERCLERK7782 1982-1-231300.0010 EricHuDeveloper1455 2011-5-26 15500.0014.0010 huyongPM1455 2011-5-26 15500.0014.0010 WANGJINGDeveloper1455 2011-5-26 15500.0014.0010 rows selected

Scott.dept表的现有数据如下：

SQL> select * from dept; DEPTNO DNAMELOC ------ -------------- ------------- ACCOUNTINGNEW YORK RESEARCHDALLAS SALESCHICAGO OPERATIONSBOSTON 50abc50def DeveloperHaiKou 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。

【ORACLE|ORACLE SQL（经典查询练手第一篇(不懂装懂，永世饭桶！)）】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 ENAMEJOBMGR HIREDATESALCOMM DEPTNO ----- ---------- --------- ----- ----------- --------- --------- ------ ALLENSALESMAN7698 1981-2-201600.00300.0030 WARDSALESMAN7698 1981-2-221250.00500.0030 JONESMANAGER7839 1981-4-22975.0020 MARTINSALESMAN7698 1981-9-281250.001400.0030 BLAKEMANAGER7839 1981-5-12850.0030 CLARKMANAGER7839 1981-6-92450.0010 SCOTTANALYST7566 1987-4-194000.0020 KINGPRESIDENT1981-11-175000.0010 TURNERSALESMAN7698 1981-9-81500.000.0030 ADAMSCLERK7788 1987-5-231100.0020 JAMESCLERK7698 1981-12-3950.0030 FORDANALYST7566 1981-12-33000.0020 MILLERCLERK7782 1982-1-231300.0010 EricHuDeveloper1455 2011-5-26 15500.0014.0010 huyongPM1455 2011-5-26 15500.0014.0010 WANGJINGDeveloper1455 2011-5-26 15500.0014.0010 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; ENAMEBOSS_NAME ---------- ---------- SMITHFORD ALLENBLAKE WARDBLAKE JONESKING MARTINBLAKE BLAKEKING CLARKKING SCOTTJONES KING TURNERBLAKE ADAMSSCOTT JAMESBLAKE FORDJONES MILLERCLARK 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; DNAMEEMPNO ENAMEJOBMGR HIREDATESAL DEPTNO -------------- ----- ---------- --------- ----- ----------- --------- ------ RESEARCH7369 SMITHCLERK7902 1980-12-17800.0020 SALES7499 ALLENSALESMAN7698 1981-2-201600.0030 SALES7521 WARDSALESMAN7698 1981-2-221250.0030 RESEARCH7566 JONESMANAGER7839 1981-4-22975.0020 SALES7654 MARTINSALESMAN7698 1981-9-281250.0030 SALES7698 BLAKEMANAGER7839 1981-5-12850.0030 ACCOUNTING7782 CLARKMANAGER7839 1981-6-92450.0010 RESEARCH7788 SCOTTANALYST7566 1987-4-194000.0020 ACCOUNTING7839 KINGPRESIDENT1981-11-175000.0010 SALES7844 TURNERSALESMAN7698 1981-9-81500.0030 RESEARCH7876 ADAMSCLERK7788 1987-5-231100.0020 SALES7900 JAMESCLERK7698 1981-12-3950.0030 RESEARCH7902 FORDANALYST7566 1981-12-33000.0020 ACCOUNTING7934 MILLERCLERK7782 1982-1-231300.0010 ACCOUNTING102 EricHuDeveloper1455 2011-5-26 15500.0010 ACCOUNTING104 huyongPM1455 2011-5-26 15500.0010 ACCOUNTING105 WANGJINGDeveloper1455 2011-5-26 15500.0010 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'; 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 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; 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 ---------- --------- JONES2975.00 SCOTT4000.00 KING5000.00 FORD3000.00 EricHu5500.00 huyong5500.00 WANGJING5500.00 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; DEPTNAMEDEPTCOUNT DEPTAVGSAL -------------- ---------- ---------- ACCOUNTING6 4208.33333 RESEARCH52375 SALES6 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; ENAMEDEPTNAMESAL ---------- -------------- --------- SMITHRESEARCH800.00 ALLENSALES1600.00 WARDSALES1250.00 JONESRESEARCH2975.00 MARTINSALES1250.00 BLAKESALES2850.00 CLARKACCOUNTING2450.00 SCOTTRESEARCH4000.00 KINGACCOUNTING5000.00 TURNERSALES1500.00 ADAMSRESEARCH1100.00 JAMESSALES950.00 FORDRESEARCH3000.00 MILLERACCOUNTING1300.00 EricHuACCOUNTING5500.00 huyongACCOUNTING5500.00 WANGJINGACCOUNTING5500.00 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 DNAMELOCDEPTCOUNT ------ -------------- ------------- ---------- ACCOUNTINGNEW YORK6 RESEARCHDALLAS5 SALESCHICAGO6 OPERATIONSBOSTON 50abc50def DeveloperHaiKou rows selected--------16．列出各种工作的最低工资。--------- SQL> select job,avg(sal) from emp group by job; JOBAVG(SAL) --------- ---------- ANALYST3500 CLERK1037.5 Developer5500 MANAGER2758.33333 PM5500 PRESIDENT5000 SALESMAN1400 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; DEPTNOMIN(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; ENAMESALPERSAL ---------- ---------- SMITH9600 JAMES11400 ADAMS13200 MILLER15600 TURNER18000 WARD21000 ALLEN22800 CLARK29400 MARTIN31800 BLAKE34200 JONES35700 FORD36000 SCOTT48000 KING60000 EricHu66168 huyong66168 WANGJING66168 rows selected