Oracle使用子查询一次性更新或插入多条语句

1.insert子查询

以下例子先创建一个表，然后把已有表emp中的数据插入到该表中。

SQL> create table mytab(id number(4),ename varchar2(20),deptno number(4));

表已创建。

SQL> desc emp;
名称                                      是否为空? 类型
----------------------------------------- -------- ----------------------------

EMPNO                                     NOT NULL NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                             NUMBER(2)

SQL> insert into mytab select empno,ename,deptno from emp where deptno=10;

已创建3行。

SQL> select * from mytab;

        ID ENAME                                        DEPTNO
---------- ---------------------------------------- ----------
      7782 CLARK                                            10
      7839 KING                                             10
      7934 MILLER                                           10

SQL>

2.update子查询

更新SCOTT的岗位、工资、奖金都与SMITH一样。

update emp set job=(select job from emp where ename='SMTIH') ,
sal=(select sal from emp where ename='SMTIH')
where ename='SCOTT';

update emp set(job,sal,comm) =(select job,sal,comm from emp where ename='SMITH') where ename='SCOTT';