【SQL】SELECT语句中集合运算符 UNION/INTERSECT/MINUS
来源:互联网 发布:灭火器配置计算软件 编辑:程序博客网 时间:2024/06/05 09:59
使用UNION(ALL)、INTERSECT、MINUS可以对子查询的结果集进行结合运算:
创建测试表
create table test1 as select * from emp where deptno in (10,20);
create table test2 as select * from emp where deptno in (20,30);
测试表test1:包含scott.emp表中10号和20号部门员工信息
SCOTT@PROD>select * from test1 order by deptno;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7934 MILLER CLERK 7782 23-JAN-82 1300 10
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7839 KING PRESIDENT 17-NOV-81 5000 10
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7566 JONES MANAGER 7839 02-APR-81 2975 20
7369 SMITH CLERK 7902 17-DEC-80 800 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
8 rows selected.
测试表test2:包含scott.emp表中20号和30号部门员工信息
SCOTT@PROD>select * from test2 order by deptno;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80 800 20
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7566 JONES MANAGER 7839 02-APR-81 2975 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
11 rows selected.
UNION:两个子查询并集,去重,排序
SCOTT@PROD>select empno,ename,job,deptno from test1
union select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7369 SMITH CLERK 20
7499 ALLEN SALESMAN 30
7521 WARD SALESMAN 30
7566 JONES MANAGER 20
7654 MARTIN SALESMAN 30
7698 BLAKE MANAGER 30
7782 CLARK MANAGER 10
7788 SCOTT ANALYST 20
7839 KING PRESIDENT 10
7844 TURNER SALESMAN 30
7876 ADAMS CLERK 20
7900 JAMES CLERK 30
7902 FORD ANALYST 20
7934 MILLER CLERK 10
14 rows selected.
UNION ALL:两个子查询并集,不去重,不排序
SCOTT@PROD>select empno,ename,job,deptno from test1
union all select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7369 SMITH CLERK 20
7566 JONES MANAGER 20
7782 CLARK MANAGER 10
7788 SCOTT ANALYST 20
7839 KING PRESIDENT 10
7876 ADAMS CLERK 20
7902 FORD ANALYST 20
7934 MILLER CLERK 10
7369 SMITH CLERK 20
7499 ALLEN SALESMAN 30
7521 WARD SALESMAN 30
7566 JONES MANAGER 20
7654 MARTIN SALESMAN 30
7698 BLAKE MANAGER 30
7788 SCOTT ANALYST 20
7844 TURNER SALESMAN 30
7876 ADAMS CLERK 20
7900 JAMES CLERK 30
7902 FORD ANALYST 20
19 rows selected.
INTERSECT:两个子查询交集,去重,排序
SCOTT@PROD>select empno,ename,job,deptno from test1
intersect select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7369 SMITH CLERK 20
7566 JONES MANAGER 20
7788 SCOTT ANALYST 20
7876 ADAMS CLERK 20
7902 FORD ANALYST 20
MINUS:两个子查询差集,去重,排序
SCOTT@PROD>select empno,ename,job,deptno from test1
minus select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7782 CLARK MANAGER 10
7839 KING PRESIDENT 10
7934 MILLER CLERK 10
使用UNION(ALL)、INTERSECT、MINUS可以对子查询的结果集进行结合运算:
创建测试表
create table test1 as select * from emp where deptno in (10,20);
create table test2 as select * from emp where deptno in (20,30);
测试表test1:包含scott.emp表中10号和20号部门员工信息
SCOTT@PROD>select * from test1 order by deptno;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7934 MILLER CLERK 7782 23-JAN-82 1300 10
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7839 KING PRESIDENT 17-NOV-81 5000 10
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7566 JONES MANAGER 7839 02-APR-81 2975 20
7369 SMITH CLERK 7902 17-DEC-80 800 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
8 rows selected.
测试表test2:包含scott.emp表中20号和30号部门员工信息
SCOTT@PROD>select * from test2 order by deptno;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80 800 20
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7566 JONES MANAGER 7839 02-APR-81 2975 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
11 rows selected.
UNION:两个子查询并集,去重,排序
SCOTT@PROD>select empno,ename,job,deptno from test1
union select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7369 SMITH CLERK 20
7499 ALLEN SALESMAN 30
7521 WARD SALESMAN 30
7566 JONES MANAGER 20
7654 MARTIN SALESMAN 30
7698 BLAKE MANAGER 30
7782 CLARK MANAGER 10
7788 SCOTT ANALYST 20
7839 KING PRESIDENT 10
7844 TURNER SALESMAN 30
7876 ADAMS CLERK 20
7900 JAMES CLERK 30
7902 FORD ANALYST 20
7934 MILLER CLERK 10
14 rows selected.
UNION ALL:两个子查询并集,不去重,不排序
SCOTT@PROD>select empno,ename,job,deptno from test1
union all select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7369 SMITH CLERK 20
7566 JONES MANAGER 20
7782 CLARK MANAGER 10
7788 SCOTT ANALYST 20
7839 KING PRESIDENT 10
7876 ADAMS CLERK 20
7902 FORD ANALYST 20
7934 MILLER CLERK 10
7369 SMITH CLERK 20
7499 ALLEN SALESMAN 30
7521 WARD SALESMAN 30
7566 JONES MANAGER 20
7654 MARTIN SALESMAN 30
7698 BLAKE MANAGER 30
7788 SCOTT ANALYST 20
7844 TURNER SALESMAN 30
7876 ADAMS CLERK 20
7900 JAMES CLERK 30
7902 FORD ANALYST 20
19 rows selected.
INTERSECT:两个子查询交集,去重,排序
SCOTT@PROD>select empno,ename,job,deptno from test1
intersect select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7369 SMITH CLERK 20
7566 JONES MANAGER 20
7788 SCOTT ANALYST 20
7876 ADAMS CLERK 20
7902 FORD ANALYST 20
MINUS:两个子查询差集,去重,排序
SCOTT@PROD>select empno,ename,job,deptno from test1
minus select empno,ename,job,deptno from test2;
EMPNO ENAME JOB DEPTNO
---------- ---------- --------- ----------
7782 CLARK MANAGER 10
7839 KING PRESIDENT 10
7934 MILLER CLERK 10
文章出自:http://blog.itpub.net/29475508/viewspace-1472168
0 0
- 【SQL】SELECT语句中集合运算符 UNION/INTERSECT/MINUS
- ORACLE中集合操作符union/union all/Intersect/Minus用法
- Oracle集合运算符,合集:Union/Union All ,交集:Intersect,差集:Minus
- SQL语句的MINUS,INTERSECT和UNION ALL
- SQL语句的MINUS,INTERSECT和UNION ALL
- SQL语句的MINUS,INTERSECT和UNION ALL
- Oracle中SQL语句学习三(union,Intersect,Minus)
- SQL语句的MINUS,INTERSECT和UNION ALL
- SQL语句的MINUS,INTERSECT和UNION ALL
- SQL语句的MINUS,INTERSECT和UNION ALL
- 集合运算(UNION、UNION ALL、INTERSECT、MINUS)
- SQL中MINUS、INTERSECT、UNION、UNION All
- 常用SQL查询语句 Oracle中Union,Union All,Intersect,Minus的有什么区别
- SQL中union, intersect 和 minus
- UNION ,INTERSECT,MINUS
- UNION-MINUS-INTERSECT-UNIONALL
- oracle union intersect minus
- SQL里的Union/Union all/Intersect/Minus
- select和epoll的区别
- DSP tms28377 DAC
- CentOS 6.4中安装JDK 1.7 + Eclipse
- Git 常用命令详解
- c#调用Aspose.Word组件操作word 插入文字/图片/表格 书签替换套打
- 【SQL】SELECT语句中集合运算符 UNION/INTERSECT/MINUS
- HDU1053 Entropy(huffman编码)
- JS prototype
- 关于中标麒麟系统的经历
- 关于整数后移问题(简单应用)
- xcode6.2 自制framework
- 归档—监控ORACLE数据库告警日志
- annotation 注解做springmvc 的登录权限校验案例
- ThinkPHP+Oracle执行存储过程