--1、列出至少有一个雇员的所有部门/*SELECT DISTINCT t1.deptno, t2.dnameFROM emp t1, dept t2WHERE t1.deptno = t2.deptnoORDER BY t1.deptno*/--2、列出薪金比"SMITH"多的所有雇员/*SELECT empno, ename, nvl(sal, 0) AS salaryFROM empWHERE nvl(sal, 0) > (SELECT nvl(sal, 0) FROM emp WHERE ename = 'SMITH')*/--3、列出所有雇员的姓名及其直接上级的姓名/*SELECT t1.ename, t2.enameFROM (SELECT ename, mgr FROM emp) t1, (SELECT ename, empno FROM emp) t2WHERE t1.mgr = t2.empno*/--4、列出入职日期早于其直接上级的所有雇员/*SELECT t1.ename, t1.hiredate, t2.ename, t2.hiredateFROM (SELECT ename, mgr, hiredate FROM emp) t1, (SELECT ename, empno, hiredate FROM emp) t2WHERE t1.mgr = t2.empno AND t1.hiredate < t2.hiredate*/--5、列出部门名称和这些部门的雇员,同时列出那些没有雇员的部门/*SELECT dept.dname, emp.enameFROM emp, deptWHERE emp.deptno(+) = dept.deptno*//*SELECT *FROM empRIGHT JOIN deptON emp.deptno = dept.deptno*/--6、列出所有"CLERK"（办事员）的姓名及其部门名称/*SELECT emp.ename, dept.dnameFROM emp, deptWHERE emp.deptno = dept.deptno AND emp.job = 'CLERK'*/--7、列出各种工作类别的最低薪金，显示最低薪金大于1500的记录/*SELECT t2.*FROM (SELECT deptno, MIN(nvl(sal, 0)) AS minsal FROM emp GROUP BY deptno ORDER BY deptno) t2WHERE t2.minsal > 1500*/--8、列出从事"SALES"（销售）工作的雇员的姓名，假定不知道销售部的部门编号/*SELECT *FROM empWHERE job = 'SALESMAN'*/--9、列出薪金高于公司平均水平的所有雇员/*SELECT *FROM empWHERE nvl(sal, 0) > (SELECT AVG(nvl(sal, 0)) FROM emp)ORDER BY deptno*/--10、列出与"SCOTT"从事相同工作的所有雇员/*SELECT *FROM empWHERE job = (SELECT JOB FROM emp WHERE ename = 'SCOTT') AND ename <> 'SCOTT'*/--11、列出某些雇员的姓名和薪金，条件是他们的薪金等于部门30中任何一个雇员的薪金/*SELECT *FROM empWHERE nvl(sal, 0) IN (SELECT nvl(sal, 0) FROM emp WHERE deptno = 30) AND deptno IN (10, 20)*/--12、列出某些雇员的姓名和薪金，条件是他们的薪金高于部门30中所有雇员的薪金/*SELECT *FROM empWHERE nvl(sal, 0) > ANY (SELECT nvl(sal, 0) FROM emp WHERE deptno = 30) AND deptno IN (10, 20)*/--13、列出每个部门的信息以及该部门中雇员的数量/*SELECT dept.deptno, dept.dname, dept.loc, t1.cntFROM dept, (SELECT deptno, COUNT(*) cnt FROM emp GROUP BY deptno ORDER BY deptno) t1WHERE dept.deptno = t1.deptno*/--14、列出所有雇员的雇员名称、部门名称和薪金/*SELECT emp.ename AS 雇员名称, dept.dname AS 部门名称, nvl(emp.sal, 0) AS 薪金FROM emp, deptWHERE emp.deptno = dept.deptno*/--15、列出从事同一种工作但属于不同部门的雇员的不同组合 ??/*SELECT e1.ename, e2.ename, e1.jobFROM emp e1, emp e2WHERE e1.job = e2.job AND e1.deptno <> e2.deptnoORDER BY job*/--16、列出分配有雇员数量的所有部门的详细信息，即使是分配有0个雇员/*SELECT *FROM emp, deptWHERE emp.deptno(+) = dept.deptno*/--17、列出各种类别工作的最低工资/*SELECT job 工作类别, MIN(nvl(sal, 0) + nvl(comm, 0)) 最低工资FROM empGROUP BY job*/--18、列出各个部门的MANAGER（经理）的最低薪金/*SELECT deptno, MIN(nvl(sal, 0)) 最低薪金FROM empWHERE job = 'MANAGER'GROUP BY deptno*/--19、列出按年薪排序的所有雇员的年薪/*SELECT emp.*, (nvl(sal, 0) + nvl(comm, 0)) * 12 AS 年薪FROM empORDER BY (nvl(sal, 0) + nvl(comm, 0)) DESC*/--20、列出薪金水平处于第四位的雇员/*SELECT t2.*FROM (SELECT t1.*, rownum grade FROM (SELECT * FROM emp ORDER BY nvl(sal, 0) DESC) t1) t2WHERE t2.grade = 4*/---/*SELECT t1.*, rownum gradeFROM (SELECT * FROM emp ORDER BY nvl(sal, 0) DESC) t1WHERE rownum <= 4MINUSSELECT t1.*, rownum gradeFROM (SELECT * FROM emp ORDER BY nvl(sal, 0) DESC) t1WHERE rownum <= 3*/--21、查出工资的前4名(工资 = sal + comm)/*SELECT t1.*, rownum gradeFROM (SELECT * FROM emp ORDER BY nvl(sal, 0) + nvl(comm, 0) DESC) t1WHERE rownum <= 4*/--22、查出2~4名(工资 = sal + comm)?/*SELECT t1.*FROM (SELECT e.*, row_number() over(ORDER BY nvl(sal, 0) + nvl(comm, 0) DESC) grade FROM emp e) t1WHERE t1.grade BETWEEN 2 AND 4*/--23、查出员工工资在3~6名的员工每人扣100元 (工资 = sal + comm)?--24、查出员工工资在3~6名的员工每人扣100元后,姓名,工资,部门,等级 (工资 = sal + comm)?
