where ename ='SMITH'
)
where job =
(
select job from emp where ename ='SMITH'
)
;
--去除销售部门
delete from emp where deptno =
(
select deptno from dept
where dname ='SALES'
)
;
--DML语句中使用子查询
--insert中
insert into employee (id,name,title,salary)
select emptno,ename ,job,sal from emp;
--update中
update emp set (sal,comm)=
(
select sal,comm from emp
where ename ='SMITH'
)
where job =
(
select job from emp where ename ='SMITH'
)
;
--去除销售部门
delete from emp where deptno =
(
select deptno from dept
where dname ='SALES'
)
;
4、在DDL语句中使用子查询
通过select子查询来实现创建视图的方式来说明其使用方法
需要注意的是在执行下面的sql语句之前,要对scott用户赋予创建视图的权利
[sql] view plaincopyprint?
SQL>conn / as sysdba
SQL>grant create view to scott;
SQL>conn / as sysdba
SQL>grant create view to scott;
[sql] view plaincopyprint?
--创建视图并查询视图
create or replace view dept10 as
select empno,ename ,job,sal,deptno from emp
where deptno = 10 order by empno;
select * from dept10;
--创建视图并查询视图
create or replace view dept10 as
select empno,ename ,job,sal,deptno from emp
where deptno = 10 order by empno;
select * from dept10;
关于子查询的相关信息就到这里了。
原文转自:http://blog.csdn.net/kiritor/article/details/8782257