Oracle数据库简单使用总结

叁歲伎倆 2021-09-07 06:04 394阅读 0赞

查询员工在1982-1-1年之后入职的人

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Like模糊查询

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第三个字母为O的员工姓名

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需要用到多个or的时候用“in（）”代替

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使用is null查询没有上级的雇员的情况

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Select \* from emp where (sal>500 or jop=’manager’ ) and ename like ‘J%’;

使用order by 实现降序desc排序 默认升序（asc）

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按照部门升序 和 薪水降序

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使用别名进行排序

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工资高于平均工资的员工信息

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Group by 分组函数； 查询每个部门的最高工资和平均工资

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Select avg(sal), max(sal), deptno from emp group by deptno having avg(sal)>2000;

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Select a1.dname, a2.ename,a2.sal from dept a1, emp a2 where a1.deptno =a2.deptno and a1.deptno = 10;

Between使用

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Select a1.ename ,a1.sal,a2.grade from emp a1,salgrade a2 where a1.sal between a2.losal and a2.hisal;

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Select a1.ename,a1.sal,a2.dname,a2.deptno from emp a1,dept a2 where a1.deptno=a2.deptno order by a2.deptno;

自链接

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select w.ename,b.ename from emp w, emp b where w.mgr=b.empno and w.ename='FORD';

多行子查询

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select \* from emp where job in (select distinct job from emp where deptno=10);

distinct 去除重复行

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多列子查询

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select \* from emp where (deptno, job)=(select deptno, job from emp where ename='SMITH');

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方法1

select \* from emp a1, (select avg(sal) mysal,deptno from emp group by deptno)a2 where a1.deptno = a2.deptno and a1.sal>a2.mysal;

方法2

select \* from emp , dept where emp.deptno=dept.deptno and emp.sal>(select avg(sa) deptno from emp group by deptno);

rownum 分页查询 当公式用来记忆

select \* from (select a1.\* ,rownum rn from (select \* from emp) a1 where rownum<=10) where rn>5;

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用查询结果创建表

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合并查询

union

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Union all

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intersect

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minus

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添加

Insert into 表名(列名1，列名2) values （值1，值2）；

修改

Update 表名 sel 字段1=值1，字段2=值2 where 条件；

删除

Delete from 表名 where 条件；

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