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oracle常用sql查询语句部门集合(图文)

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陈嘉凯 显示全部楼层 发表于 2021-10-26 14:15:27 |阅读模式 打印 上一主题 下一主题
Oracle查询语句
select * from scott.emp ;
[img=504,254 src=]https://www.caogenba.net/[/img]
1.--dense_rank()分析函数(查找每个部分工资最高前三名员工信息)
select * from (select deptno,ename,sal,dense_rank() over(partition by deptno order by sal desc) a from scott.emp) where a<=3 order by deptno asc,sal desc ;
结果:
[img=243,166 src=]https://www.caogenba.net/[/img]
--rank()分析函数(运行结果与上语句雷同)
select * from (select deptno,ename,sal,rank() over(partition by deptno order by sal desc) a from scott.emp ) where a<=3 order by deptno asc,sal desc ;
结果:
[img=237,147 src=]https://www.caogenba.net/[/img]
--row_number()分析函数(运行结果与上雷同)
select * from(select deptno,ename,sal,row_number() over(partition by deptno order by sal desc) a from scott.emp) where a<=3 order by deptno asc,sal desc ;
--rows unbounded preceding 分析函数(表现各部分的积累工资总和)
select deptno,sal,sum(sal) over(order by deptno asc rows unbounded preceding) 积累工资总和 from scott.emp ;
结果:
[img=248,215 src=]https://www.caogenba.net/[/img]
--rows 整数值 preceding(表现每最后4条记录的汇总值)
select deptno,sal,sum(sal) over(order by deptno rows 3 preceding) 每4汇总值 from scott.emp ;
结果:
[img=230,212 src=]https://www.caogenba.net/[/img]
--rows between 1 preceding and 1 following(统计3条记录的汇总值【当前记录居中】)
select deptno,ename,sal,sum(sal) over(order by deptno rows between 1 preceding and 1 following) 汇总值 from scott.emp ;
结果:
[img=270,213 src=]https://www.caogenba.net/[/img]
--ratio_to_report(表现员工工资及占该部分总工资的比例)
select deptno,sal,ratio_to_report(sal) over(partition by deptno) 比例 from scott.emp ;
结果:
[img=267,126 src=]https://www.caogenba.net/[/img]
--查看全部用户
select * from dba_users ;
select count(*) from dba_users ;
select * from all_users ;
select * from user_users ;
select * from dba_roles ;
--查看用户系统权限
select * from dba_sys_privs ;
select * from user_users ;
--查看用户对象或角色权限
select * from dba_tab_privs ;
select * from all_tab_privs ;
select * from user_tab_privs ;
--查看用户或角色所拥有的角色
select * from dba_role_privs ;
select * from user_role_privs ;
-- rownum:查询10至12信息
select * from scott.emp a where rownum<=3 and a.empno not in(select b.empno from scott.emp b where rownum<=9);
结果:
[img=480,58 src=]https://www.caogenba.net/[/img]
--not exists;查询emp表在dept表中没有的数据
select * from scott.emp a where not exists(select * from scott.dept b where a.empno=b.deptno) ;
结果:
[img=495,95 src=]https://www.caogenba.net/[/img]
--rowid;查询重复数据信息
select * from scott.emp a where a.rowid>(select min(x.rowid) from scott.emp x where x.empno=a.empno);
--根据rowid来分页(一万条数据,查询10000至9980时间大概在0.03秒左右)
select * from scott.emp where rowid in(select rid from(select rownum rn,rid from(select rowid rid,empno from scott.emp order by empno desc) where rownum<10)where rn>=1)order by empno desc ;
结果:
[img=494,85 src=]https://www.caogenba.net/[/img]
--根据分析函数分页(一万条数据,查询10000至9980时间大概在1.01秒左右)
select * from(select a.*,row_number() over(order by empno desc) rk from scott.emp a ) where rk<10 and rk>=1;
结果:
[img=526,64 src=]https://www.caogenba.net/[/img]
--rownum分页(一万条数据,查询10000至9980时间大概在0.01秒左右)
select * from(select t.*,rownum rn from(select * from scott.emp order by empno desc)t where rownum<10) where rn>=1;
select * from(select a.*,rownum rn from (select * from scott.emp) a where rownum<=10) where rn>=5 ;
--left outer join:左毗连
select a.*,b.* from scott.emp a left outer join scott.dept b on a.deptno=b.deptno ;
--right outer join:右毗连
select a.*,b.* from scott.emp a right outer join scott.dept b on a.deptno=b.deptno ;
--inner join
select a.*,b.* from scott.emp a inner  join scott.dept b on a.deptno=b.deptno ;
--full join
select a.*,b.* from scott.emp a full join scott.dept b on a.deptno=b.deptno ;
select a.*,b.* from scott.emp a,scott.dept b where a.deptno(+)=b.deptno ;
select distinct ename,sal from scott.emp a group by sal having ;
select * from scott.dept ;
select * from scott.emp ;
--case when then end (交织报表)
select ename,sal,case deptno when 10 then '管帐部' when 20 then '研究部' when 30 then '销售部' else '其他部分' end 部分 from scott.emp ;
结果:
[img=195,102 src=]https://www.caogenba.net/[/img]
select ename,sal,case when sal>0 and sal<1500 then '一级工资' when sal>=1500 and sal<3000 then '二级工资' when sal>=3000 and sal<4500 then '三级工资' else '四级工资' end 工资等级 from scott.emp order by sal desc ;
结果:
[img=213,146 src=]https://www.caogenba.net/[/img]
--交织报表是使用分组函数与case布局一起实现
select 姓名,sum(case 课程 when '数学' then 分数 end)数学,sum(case 课程 when '历史' then 分数 end)历史 from 门生 group by 姓名 ;
--decode 函数
select 姓名,sum(decode(课程,'数学',分数,null))数学,sum(decode(课程,'语文',分数,null))语文,sum(decode(课程,'历史','分数',null))历史 from 门生 group by 姓名 ;
--level。。。。connect by(条理查询)
select level,emp.* from scott.emp connect by prior empno = mgr order by level ;
结果:
[img=552,83 src=]https://www.caogenba.net/[/img]
--sys_connect_by_path函数
select ename,sys_connect_by_path(ename,'/') from scott.emp start with mgr is null connect by prior empno=mgr ;
结果:
[img=298,65 src=]https://www.caogenba.net/[/img]
--start with connect by prior 语法
select lpad(ename,3*(level),'')姓名,lpad(ename,3*(level),'')姓名 from scott.emp where job<>'CLERK' start with mgr is null connect by prior mgr = empno ;
--level与prior关键字
select level,emp.* from scott.emp start with ename='SCOTT' connect by prior empno=mgr;
select level,emp.* from scott.emp start with ename='SCOTT' connect by empno = prior mgr ;
结果:
[img=546,61 src=]https://www.caogenba.net/[/img]
--等值毗连
select empno,ename,job,sal,dname from scott.emp a,scott.dept b where a.deptno=b.deptno and (a.deptno=10 or sal>2500);
结果:
[img=328,107 src=]https://www.caogenba.net/[/img]
--非等值毗连
select a.ename,a.sal,b.grade from scott.emp a,scott.salgrade b where a.sal between b.losal and b.hisal ;
结果:
[img=200,95 src=]https://www.caogenba.net/[/img]
--自毗连
select a.ename,a.sal,b.ename from scott.emp a,scott.emp b where a.mgr=b.empno ;
结果:
[img=199,87 src=]https://www.caogenba.net/[/img]
--左外毗连
select a.ename,a.sal,b.ename from scott.emp a,scott.emp b where a.mgr=b.empno(+);
结果:
[img=199,95 src=]https://www.caogenba.net/[/img]
--多表毗连
select * from scott.emp ,scott.dept,scott.salgrade where scott.emp.deptno=scott.dept.deptno and scott.emp.sal between scott.salgrade.losal and scott.salgrade.hisal ;
结果:
[img=820,80 src=]https://www.caogenba.net/[/img]
select * from scott.emp a join scott.dept b on a.deptno=b.deptno join scott.salgrade s on a.sal between s.losal and s.hisal where a.sal>1000;
select * from(select * from scott.emp a join scott.dept b on a.deptno=b.deptno where a.sal>1000) c join scott.salgrade s on c.sal between s.losal and s.hisal ;
--单行子查询
select * from scott.emp a where a.deptno=(select deptno from scott.dept where loc='NEW YORK');
select * from scott.emp a where a.deptno in (select deptno from scott.dept where loc='NEW YORK');
结果:
[img=493,63 src=]https://www.caogenba.net/[/img]
--单行子查询在 from 后
select scott.emp.*,(select deptno from scott.dept where loc='NEW YORK') a from scott.emp ;
--使用 in ,all,any 多行子查询
--in:表示便是查询出来的对应数据
select ename,job,sal,deptno from scott.emp where job in(select distinct job from scott.emp where deptno=10);
--all:表示大于全部括号中查询出来的对应的数据信息
select ename,sal,deptno from scott.emp where sal>all(select sal from scott.emp where deptno=30);
--any:表示大于括号查询出来的此中恣意一个即可(只随机一个)
select ename,sal,deptno from scott.emp where sal>any(select sal from scott.emp where deptno=30);
--多列子查询
select ename,job,sal,deptno from scott.emp where(deptno,job)=(select deptno,job from scott.emp where ename='SCOTT');
select ename,job,sal,deptno from scott.emp where(sal,nvl(comm,-1)) in(select sal,nvl(comm,-1) from scott.emp where deptno=30);
--非成对比力
select ename,job,sal,deptno from scott.emp where sal in(select sal from scott.emp where deptno=30) and nvl(comm,-1) in(select nvl(comm,-1) from scott.emp where deptno=30);
--其他子查询
select ename,job,sal,deptno from scott.emp where exists(select null from scott.dept where scott.dept.deptno=scott.emp.deptno and scott.dept.loc='NEW YORK');
select ename,job,sal from scott.emp join(select deptno,avg(sal) avgsal,null from scott.emp group by deptno) dept on emp.deptno=dept.deptno where sal>dept.avgsal ;
create table scott.test(
       ename varchar(20),
       job varchar(20)
);
--drop table test ;
select * from scott.test ;
--Insert与子查询(表间数据的拷贝)
insert into scott.test(ename,job) select ename,job from scott.emp ;
--Update与子查询
update scott.test set(ename,job)=(select ename,job from scott.emp where ename='SCOTT' and deptno ='10');
--创建表时,还可以指定列名
create table scott.test_1(ename,job) as select ename,job from scott.emp ;
select * from scott.test_1 ;
--delete与子查询
delete from scott.test where ename in('');
--归并查询
--union语法(合而且去除重复行,且排序)
select ename,sal,deptno from scott.emp where deptno>10 union select ename,sal,deptno from scott.emp where deptno<30 ;
select a.deptno from scott.emp a union select b.deptno from scott.dept b ;
--union all(直接将两个结果聚集并,不排序)
select ename,sal,deptno from scott.emp where deptno>10 union all select ename,sal,deptno from scott.emp where deptno<30 ;
select a.deptno from scott.emp a union all select b.deptno from scott.dept b ;
--intersect:取交集
select ename,sal,deptno from scott.emp where deptno>10 intersect select ename,sal,deptno from scott.emp where deptno<30;
--表现部分工资总和高于雇员工资总和三分之一的部分名及工资总和
select dname as 部分,sum(sal) as 工资总和 from scott.emp a,scott.dept b where a.deptno=b.deptno group by dname having sum(sal)>(select sum(sal)/3 from scott.emp c,scott.dept d where c.deptno=d.deptno);
结果:
[img=178,35 src=]https://www.caogenba.net/[/img]
--使用with得到以上同样的结果
with test as (select dname ,sum(sal) sumsal  from scott.emp ,scott.dept where scott.emp.deptno=scott.dept.deptno group by dname) select dname as 部分,sumsal as 工资总和 from scott.test where sumsal>(select sum(sumsal)/3 from scott.test);
结果:
[img=172,34 src=]https://www.caogenba.net/[/img]
--分析函数
select ename,sal,sum(sal) over(partition by deptno order by sal desc) from scott.emp ;
--rows n preceding(窗口子句一)
select deptno,sal,sum(sal) over(order by sal rows 5 preceding) from scott.emp ;
结果:
[img=357,93 src=]https://www.caogenba.net/[/img]
--rum(..) over(..)..
select sal,sum(1) over(order by sal) aa from scott.emp  ;
select deptno,ename,sal,sum(sal) over(order by ename) 连续求和,sum(sal) over() 总和,100*round(sal/sum(sal) over(),4) as 份额 from scott.emp;
结果:
[img=373,79 src=]https://www.caogenba.net/[/img]
select deptno,ename,sal,sum(sal) over(partition by deptno order by ename) 部分连续求和,sum(sal) over(partition by deptno) 部分总和,100*round(sal/sum(sal) over(),4) as 总份额 from scott.emp;
结果:
[img=437,78 src=]https://www.caogenba.net/[/img]
select deptno,sal,rank() over (partition by deptno order by sal),dense_rank() over(partition by deptno order by sal) from scott.emp order by deptno ;
结果;
[img=565,73 src=]https://www.caogenba.net/[/img]
select * from (select rank() over(partition by 课程 order by 分数 desc) rk,分析函数_rank.* from 分析函数_rank) where rk<=3 ;
--dense_rank():有重复的数字不跳着分列
--row_number()
select deptno,sal,row_number() over(partition by deptno order by sal) rm from scott.emp ;
结果:
[img=186,76 src=]https://www.caogenba.net/[/img]
--lag()和lead()
select deptno,sal,lag(sal) over(partition by deptno order by sal) 上一个,lead(sal) over(partition by deptno order by sal) from scott.emp ;
结果:
[img=410,76 src=]https://www.caogenba.net/[/img]
--max(),min(),avg()
select deptno,sal,max(sal) over(partition by deptno order by sal)最大,min(sal) over(partition by deptno order by sal)最小,avg(sal) over(partition by deptno order by sal)平均 from scott.emp ;
结果:
[img=357,71 src=]https://www.caogenba.net/[/img]
--first_value(),last_value()
select deptno,sal,first_value(sal) over(partition by deptno)最前,last_value(sal) over(partition by deptno )最后 from scott.emp ;
结果:
[img=242,79 src=]https://www.caogenba.net/[/img]
--分组增补 group by grouping sets
select deptno ,sal,sum(sal) from scott.emp group by grouping sets(deptno,sal);
select null,sal,sum(sal) from scott.emp group by sal union all select deptno,null,sum(sal) from scott.emp group by deptno ;
结果:
[img=204,236 src=]https://www.caogenba.net/[/img]
--rollup
select deptno,job,avg(sal) from scott.emp group by rollup(deptno,job) ;
--明白rollup等价于
select deptno,job,avg(sal) from scott.emp group by deptno,job union select deptno ,null,avg(sal) from scott.emp group by deptno union select null,null,avg(sal) from scott.emp ;
结果:
[img=264,79 src=]https://www.caogenba.net/[/img]
select deptno,job,avg(sal) a from scott.emp group by cube(deptno,job) ;
--明白CUBE
select deptno,job,avg(sal) from scott.emp group by cube(deptno,job) ;
--等价于
select deptno,job,avg(sal) from scott.emp group by grouping sets((deptno,job),(deptno),(job),());
结果:
[img=273,79 src=]https://www.caogenba.net/[/img]
--查询工资不在1500至2850之间的全部雇员名及工资
select ename,sal from scott.emp where sal not in(select sal from scott.emp where sal between 1500 and 2850 );
--部分10和30中的工资凌驾1500的雇员名及工资
select deptno,ename,sal from scott.emp a where a.deptno in(10,30) and a.sal>1500 order by sal desc ;
结果:
[img=213,78 src=]https://www.caogenba.net/[/img]
--在1981年2月1日至1981年5月1日之间雇佣的雇员名,岗位及雇佣日期,并以雇佣日期先后次序排序
select ename as 姓名,job as 岗位,hiredate as 雇佣日期 from scott.emp a where a.hiredate between to_date('1981-02-01','yyyy-mm-dd') and to_date('1981-05-01','yyyy-mm-dd') order by a.hiredate asc ;
结果:
[img=227,73 src=]https://www.caogenba.net/[/img]
select * from scott.emp where hiredate >to_date('1981-02-01','yyyy-MM-dd');
--查询得到补贴的全部雇佣名,工资及补贴额,并以工资和补贴的降序排序
select ename,sal,comm from scott.emp a where a.comm > all(0) order by comm desc;
--工资低于1500的员工增长10%的工资,工资在1500及以上的增长5%的工资并按工资高低排序(降序)
select ename as 员工姓名,sal as 补发前的工资,case when sal<1500 then (sal+sal*0.1) else (sal+sal*0.05) end 补贴后的工资 from scott.emp order by sal desc ;
结果:
[img=309,94 src=]https://www.caogenba.net/[/img]
--查询公司天天,每月,每季度,每年的资金付出数额
select sum(sal/30) as 天天发的工资,sum(sal) as 每月发的工资,sum(sal)*3 as 每季度发的工资,sum(sal)*12 as 每年发的工资 from scott.emp;
结果:
[img=449,34 src=]https://www.caogenba.net/[/img]
--查询全部员工的平均工资,总计工资,最高工资和最低工资
select avg(sal) as 平均工资,sum(sal) as 总计工资,max(sal) as 最高工资,min(sal) as 最低工资 from scott.emp;
结果:
[img=376,35 src=]https://www.caogenba.net/[/img]
--每种岗位的雇员总数宁静均工资
select job as 岗位,count(job) as 岗位雇员总数,avg(sal) as 平均工资 from scott.emp group by job order by 平均工资 desc;
结果:
[img=307,92 src=]https://www.caogenba.net/[/img]
--雇员总数以及得到补贴的雇员数
select count(*) as 公司雇员总数,count(comm) as 得到补贴的雇员人数 from scott.emp ;
--管理者的总人数
--雇员工资的最大差额
select max(sal),min(sal),(max(sal) - min(sal)) as 员工工资最大差额 from scott.emp ;
--每个部分的平均工资
select deptno,avg(sal) from scott.emp a group by a.deptno;
结果:
[img=208,60 src=]https://www.caogenba.net/[/img]
--查询每个岗位人数凌驾2人的全部职员信息
select * from scott.emp a,(select c.job,count(c.job) as sl from scott.emp c group by c.job ) b where b.sl>2 and a.job=b.job;
结果:
[img=582,77 src=]https://www.caogenba.net/[/img]
select * from scott.emp a where a.empno in(select mgr from scott.emp ) and (select count(mgr) from scott.emp)>2 ;
结果:
[img=494,105 src=]https://www.caogenba.net/[/img]
--处理重复行数据信息(删除,查找,修改)
select * from a1 a where not exists (select b.rd from (select rowid rd,row_number() over(partition by LOAN, BRANCH order by BEGIN_DATE desc) rn from a1) b where b.rn = 1 and a.rowid = b.rd);
--查询emp表数据信息重复题目
select * from scott.emp a where exists(select b.rd from(select rowid rd,row_number() over(partition by ename,job,mgr,hiredate,sal,comm,deptno order by empno asc) rn from scott.emp) b where b.rn=1 and a.rowid=b.rd);
--initcap:返回字符串,字符串第一个字母大写
select initcap(ename) Upp from scott.emp ;
结果:
[img=83,82 src=]https://www.caogenba.net/[/img]
--ascii:返回与指定的字符对应的十进制数
select ascii(a.empno) as 编号,ascii(a.ename) as 姓名,ascii(a.job) as 岗位 from scott.emp a ;
结果:
[img=186,82 src=]https://www.caogenba.net/[/img]
--chr:给出整数,返回对应的字符
select chr(ascii(ename)) as 姓名 from scott.emp ;
结果:
[img=91,64 src=]https://www.caogenba.net/[/img]
--concat:毗连字符串
select concat(a.ename,a.job)|| a.empno as 字符毗连 from scott.emp a;
结果:
[img=180,90 src=]https://www.caogenba.net/[/img]
--instr:在一个字符串中搜刮指定的字符,返回发现指定的字符的位置
select instr(a.empno,a.mgr,1,1) from scott.emp a ;
--length:返回字符串的长度
select ename,length(a.ename) as 长度,a.job,length(a.job) as 长度 from scott.emp a ;
--lower:返回字符串,并将所返回的字符小写
select a.ename as 大写,lower(a.ename) as 小写 from scott.emp a ;
结果:
[img=127,66 src=]https://www.caogenba.net/[/img]
--upper:返回字符串,并将返回字符串都大写
select lower(a.ename) as 小写名字,upper(a.ename) as 大写名字 from scott.emp a ;
结果:
[img=184,68 src=]https://www.caogenba.net/[/img]
--rpad:在列的右边粘贴字符,lpad: 在列的左边粘贴字符(不够字符则用*来填满)
select lpad(rpad(a.ename,10,'*'),16,'*') as 粘贴 from scott.emp a ;
结果:
[img=171,63 src=]https://www.caogenba.net/[/img]
--like差别角度的使用
select * from scott.emp where ename like '%XXR%';
select * from scott.emp where ename like '%S';
select * from scott.emp where ename like 'J%';
select * from scott.emp where ename like 'S';
select * from scott.emp where ename like '%S_';
--每个部分的工资总和
select a.ename,sum(sal) from scott.emp a group by ename;
--每个部分的平均工资
select a.deptno,avg(sal) from scott.emp a group by deptno ;
--每个部分的最大工资
select a.deptno,max(sal) from scott.emp a group by deptno ;
--每个部分的最小工资
select a.deptno,min(sal) from scott.emp a group by deptno ;
--查询原工资占部分工资的比率
select deptno ,sal,ratio_to_report(sal) over(partition by deptno) sal_ratio from scott.emp ;
--查询结果不合格的全部门生信息(提示:没有对应的表,只是意思意思。不合格人数大于便是三才能查)
select * from scott.emp where empno in(select distinct empno from scott.emp where 3<(select count(sal) from scott.emp where sal<3000) and empno in(select empno from scott.emp where sal<3000));
结果:
[img=487,83 src=]https://www.caogenba.net/[/img]
--查询每个部分的平均工资
select distinct deptno,avg(sal) from scott.emp group by deptno  order by deptno desc;
--union组合查出的结果,但要求查出来的数据范例必须雷同
select sal from scott.emp where sal >=all(select sal from scott.emp ) union select sal from scott.emp ;
select * from scott.emp a where a.empno between 7227 and 7369 ;--只能从小到大
---------创建表空间  要用拥有create tablespace权限的用户,比如sys
create tablespace tbs_dat datafile 'c:\oradata\tbs_dat.dbf' size 2000M;
---------添加数据文件
alter tablespace tbs_dat add datafile 'c:\oradata\tbs_dat2.dbf' size 100M;
---------改变数据文件大小
alter database datafile 'c:\oradata\tbs_dat.dbf' resize 250M;
---------数据文件自动扩展大小
alter database datafile 'c:\oradata\tbs_dat.dbf' autoextend on next 1m maxsize 20m;
---------修改表空间名称
alter tablespace tbs_dat rename to tbs_dat1;
---------删除表空间  and datafiles 表示同时删除物理文件
drop tablespace tbs_dat including contents and datafiles;
--substr(s1,s2,s3):截取s1字符串,从s2开始,结束s3
select substr(job,3,length(job)) from scott.emp ;
--replace:替换字符串
select replace(ename,'LL','aa') from scott.emp;
select * from scott.test;
insert into scott.test(ename,job) values('weather','好');
insert into scott.test(ename,job) values('wether','差');
--soundex:返回一个与给定的字符串读音雷同的字符串
select ename from scott.test where soundex(ename)=soundex('wether');
--floor:取整数
select sal,floor(sal) as 整数 from scott.emp ;
--log(n,s):返回一个以n为低,s的对数
select empno,log(empno,2) as 对数 from scott.emp ;
--mod(n1,n2):返回一个n1除以n2的余数
select empno,mod(empno,2) as 余数 from scott.emp ;
结果:
[img=142,76 src=]https://www.caogenba.net/[/img]
--power(n1,n2):返回n1的n2次方根
select empno,power(empno,2) as 方根 from scott.emp ;
--round和trunc:按照指定的精度进行舍入
select round(41.5),round(-41.8),trunc(41.6),trunc(-41.9) from scott.emp ;
--sign:取数字n的符号,大于0返回1,小于0返回-1,便是0返回0
select sign(45),sign(-21),sign(0) from scott.emp ;
结果:
[img=267,67 src=]https://www.caogenba.net/[/img]
select * from scott.emp;
oracle相关的数据库SQL查询语句:
1.  在职员表中查询出基本工资比平均基本工资高的职工编号。
2.  查询一个或者多个部分的全部员工信息,该部分的全部员工工资都高于公司的平均工资。
3.  现有张三的出生日期:1985-01-15 01:27:36,请各自新建表,将这天期时间插入表中,并计算出张三的年事,表现张三的生日。
4.  生日的输特别式要求为MM-DD(未满两位的用0不全),张三的生日为01-15。
5.  算年事要求用三个方式实现。
6.  生日要求用两个方式实现。
7.  在数据库表中有以下字符数据,如:
13-1,14-2,13-15,13-2,13-108,13-3,13-10,13-200,13-18,100-11,14-1
如今希望通过一条SQL语句进行排序,而且起首要按照前半部分的数字进行排序,然后再按照后半部分的数字进行排序,输出要拍成如下所示:
13-1,13-2,13-3,13-10,13-15,13-18,13-108,13-200,14-1,14-2,100-11
数据库表名:SellRecord;字段ListNumber;
8.  表现全部雇员的姓名以及满10年服务年限后的日期。
9.  表现雇员姓名,根据其服务年限,将最老的雇员排在最前面。
10表现全部雇员的姓名和加入公司的年份和月份,按雇员受雇日期地点月排序,将最从前份的职员排在最前面。
10.             表现假设一个月为30天的情况下全部雇员的日薪金。
11.             找出在(任何年份的)2月受聘的全部雇员(用两种方式实现)。
12.             对于每个雇员,表现其加入公司的天数。
13.             以年,月和日的方式表现全部雇员的服务年限(入职多少年/入职了多少月/入职了多少天)。
14.             找出各月最后一天受雇的全部雇员。
15.             找出早于25年之前受雇的雇员(用两种方式实现)。
16.             工资最低1500的职员增长10%,1500以上的增长5%的工资,用一条update语句实现(用两种方式实现)。
17.             按照部分统计每种岗位的平均工资,要求输出的格式如下图所示:
[img=596,102 src=]https://www.caogenba.net/[/img]
18.
[img=588,401 src=]https://www.caogenba.net/[/img]
19.
[img=561,306 src=]https://www.caogenba.net/[/img]
20.
[img=562,340 src=]https://www.caogenba.net/[/img]
21,。
[img=557,335 src=]https://www.caogenba.net/[/img]
22.
[img=566,318 src=]https://www.caogenba.net/[/img]
本人声明:以上内容出现任何错误与不足,皆与本人无关。

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