老方块oracle培训经典查询实例一

1、ORACLESQL：scott.emp 员工表结构如下scott.dept部门提示：scott.emp 表的现有数据如下SQLORACLESQL：scott.emp 员工表结构如下scott.dept部门提示：scott.emp 表的现有数据如下SQLselect*fromEMPNOMGRCOMM736979021980-12-749976981981-2-NullableDefaultDEPTNODNAME VARCHAR2(14VARCHAR2(13NullableDefaultVARCHAR2(10VARCHAR2(9) HIREDATENUMBER(7,2) NUMBER(7,2) S

2、cott.dept 表的现有数据如下SQLselect*fromDEPTNO10NEWScott.dept 表的现有数据如下SQLselect*fromDEPTNO10NEW20304050606 rows752176981981-2-756678391981-4-765476981981-9-769878391981-5-778278391981-6-778875661987-4-7839784476981981-9-787677881987-5-790076981981-12-790275661981-12-793477821982-1-102Developer 14552011-5-26

3、10414552011-5-26105Developer 14552011-5-2617rows SQL完成以下问题答案SQLselectdnamefromSQL完成以下问题答案SQLselectdnamefromdeptwheredeptnoin(selectdeptnofrom或SQLselectdnamefromdeptwheredeptnoin(selectdeptnofromempgroupydeptnohavingcount(deptno)列出各个部门的MANAGER（经理）SQLselect*fromempwheresal(selectsalfromempwhereename=E

4、MPNOMGRSQLselect*fromempwheresal(selectsalfromempwhereename=EMPNOMGRCOMM749976981981-2-752176981981-2-756678391981-4-765476981981-9-769878391981-5-778278391981-6-778875661987-4-7839784476981981-9-787677881987-5-790076981981-12-790275661981-12-793477821982-1-102Developer 14552011-5-2610414552011-5-26

5、105Developer 14552011-5-2616rowsSQLselecta.ename,(selectenamefromempbwhereb.empno=a.mgr)asmefromemp17rows SQL17rows SQLselecta.enamefromempawherea.hiredateselect2 fromdeptaleftjoinempbonEMPNOMGRSAL736979021980-12-749976981981-2-7521736979021980-12-749976981981-2-752176981981-2-756678391981-4-7654769

6、81981-9-769878391981-5-778278391981-6-778875661987-4-7839784476981981-9-787677881987-5-790076981981-12-790275661981-12-793477821982-1-102Developer 14552011-5-2610414552011-5-26105Developer 14552011-5-2620rows SQLselecta.ename,b.dnamefromempa joindeptbona.deptno=b.deptnod SQLselectdistinctjobasHighSa

7、lJob fromempgroupbyjobhaving-SQLselectenamefromempwheredeptno=(selectdeptnofromdept-SQLselectenamefromempwheredeptno=(selectdeptnofromdeptwhere6 rowsSQLselectenamefromempwheresal(selectavg(sal)from8 rowsSQLselectenamefromempwherejob=(selectjobfromempwhereSQLselectenamefromempwherejob=(selectjobfrome

8、mpwhereSQLselecta.ename,a.salfromempawherea.salin(select2 fromempbwhereb.deptno=30)and SQLselectename,salfromempwheresal(selectmax(sal)fromempwhere7 rowsSQLselect(selectb.dnamefromdeptbwherea.deptno=b.deptno)ase,count(deptno)asdeptcount,avg(sal)as2 fromempagroupbyDEPTCOUNT66SQLselecta.ename,(selectb

9、.dnamefromdeptbwhereb.deptno=a.deptno)sdeptname,salfromemp6SQLselecta.ename,(selectb.dnamefromdeptbwhereb.deptno=a.deptno)sdeptname,salfromemp17rows SQLselecta.deptno,a.dname,a.loc,(selectcount(deptno)fromempbwheredeptno=a.deptnogroupbyb.deptno)asdeptcountfromdeptDEPTNO10NEW20304050606 rowsSQLselectjob,avg(sal)fromempgroupby4050606 rowsSQLselectjob,avg(