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database application using SQL DML statements: all types of Join, Sub-Query and View.

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bhavesh lande

The document outlines a practical problem requiring the design of at least 10 SQL queries using DML statements, focusing on various types of joins, sub-queries, and views. It includes detailed examples of queries performed on an 'emp' table, demonstrating the use of sub-queries to filter and join data based on specific conditions. Additionally, the document describes the creation and manipulation of 'orange' and 'apple' tables, including the insertion of values and various join operations between them.

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Practical No: 4 Problem Statement: Design at least 10 SQL queries for suitable database application using SQL DML statements: all types of Join, Sub-Query and View. -------------------------------------------------------------------------------- ------------------------------- ##Sub-Query mysql> select * from emp; +-------+--------+-----------+------+------------+---------+---------+--------+ | empno | ename | job | mgr | hiredate | sal | comm | deptno | +-------+--------+-----------+------+------------+---------+---------+--------+ | 7369 | SMITH | CLERK | 7902 | 1980-12-17 | 800.00 | NULL | 20 | | 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 | | 7521 | WARD | SALESMAN | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 | | 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 | | 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 | | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 | | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 | | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 | 3000.00 | NULL | 20 | | 7839 | KING | PRESIDENT | NULL | 1981-11-17 | 5000.00 | NULL | 10 | | 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 | | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 | 1100.00 | NULL | 20 | | 7900 | JAMES | CLERK | 7698 | 1981-12-03 | 950.00 | NULL | 30 | | 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 | | 7934 | MILLER | CLERK | 7782 | 1982-01-23 | 1300.00 | NULL | 10 | +-------+--------+-----------+------+------------+---------+---------+--------+ 14 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno= (select deptno from emp where ename="SMITH"); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 5 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno= (select deptno from emp where ename="SMITH") and ename<>"SMITH"; +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 4 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno= (select deptno from emp where ename="SMITH"); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 |
| ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 5 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal> (select sal from emp where ename="SMITH"); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 | | FORD | 3000.00 | 20 | | MILLER | 1300.00 | 10 | +--------+---------+--------+ 13 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal> (select sal from emp where ename="SMITH") and ename<>"SMITH"; +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 | | FORD | 3000.00 | 20 | | MILLER | 1300.00 | 10 | +--------+---------+--------+ 13 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal in(select sal from emp where ename="SMITH" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | SCOTT | 3000.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 3 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal in(select sal from emp where ename="SMITH" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+
| SMITH | 800.00 | 20 | | SCOTT | 3000.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 3 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno in(select deptno from emp where ename="SMITH" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 5 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno in(select deptno from emp where ename="SMITH" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | | MILLER | 1300.00 | 10 | +--------+---------+--------+ 8 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ALL(select deptno from emp where ename="SMITH" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | TURNER | 1500.00 | 30 | | JAMES | 950.00 | 30 | +--------+---------+--------+ 6 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ANY(select deptno from emp where ename="SMITH" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | SMITH | 800.00 | 20 | | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | SCOTT | 3000.00 | 20 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 |
| FORD | 3000.00 | 20 | +--------+---------+--------+ 11 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ANY(select deptno from emp where ename="TURNER" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | SMITH | 800.00 | 20 | | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | SCOTT | 3000.00 | 20 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 | | FORD | 3000.00 | 20 | +--------+---------+--------+ 11 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ANY(select deptno from emp where ename="TURNER" OR ename="SCOTT" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | TURNER | 1500.00 | 30 | | JAMES | 950.00 | 30 | +--------+---------+--------+ 6 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > all(select deptno from emp where ename="TURNER" OR ename="SCOTT" ); Empty set (0.00 sec) mysql> select ename,sal,deptno from emp where sal > ANY(select sal from emp where ename="TURNER" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | ALLEN | 1600.00 | 30 | | JONES | 2975.00 | 20 | | BLAKE | 2850.00 | 30 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 7 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal > ALL(select sal from emp where ename="TURNER" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | KING | 5000.00 | 10 | +-------+---------+--------+
1 row in set (0.00 sec) mysql> select ename,deptno from emp where deptno=(select deptno from dept where dname="RESEARCH"); +-------+--------+ | ename | deptno | +-------+--------+ | SMITH | 20 | | JONES | 20 | | SCOTT | 20 | | ADAMS | 20 | | FORD | 20 | +-------+--------+ 5 rows in set (0.00 sec) ##Jion mysql> create table orange(o_id varchar(20),price int(12)); Query OK, 0 rows affected (0.35 sec) mysql> create table apple(a_id varchar(20),price int(12)); Query OK, 0 rows affected (0.06 sec) mysql> insert into orange values("O1",50),("O2",60); Query OK, 2 rows affected (0.30 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> insert into apple values("A1",60),("A2",60); Query OK, 2 rows affected (0.30 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> select * from apple; +------+-------+ | a_id | price | +------+-------+ | A1 | 60 | | A2 | 60 | +------+-------+ 2 rows in set (0.00 sec) mysql> select * from orange; +------+-------+ | o_id | price | +------+-------+ | O1 | 50 | | O2 | 60 | +------+-------+ 2 rows in set (0.00 sec) mysql> select * from orange,apple; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O1 | 50 | A1 | 60 | | O2 | 60 | A1 | 60 | | O1 | 50 | A2 | 60 | | O2 | 60 | A2 | 60 | +------+-------+------+-------+ 4 rows in set (0.00 sec) mysql> select * from orange o inner join apple a on o.price=a.price; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+
| O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | +------+-------+------+-------+ 2 rows in set (0.04 sec) mysql> select * from orange o left outer join apple a on o.price=a.price; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | | O1 | 50 | NULL | NULL | +------+-------+------+-------+ 3 rows in set (0.00 sec) mysql> select * from orange o right outer join apple a on o.price=a.price; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | +------+-------+------+-------+ 2 rows in set (0.00 sec) mysql> (select * from orange o left outer join apple a on o.price=a.price) union(select * from orange o right outer join apple a on o.price=a.price); +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | | O1 | 50 | NULL | NULL | +------+-------+------+-------+

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DHAKA POLYTECHNIC
 

database application using SQL DML statements: all types of Join, Sub-Query and View.

  • 1. Practical No: 4 Problem Statement: Design at least 10 SQL queries for suitable database application using SQL DML statements: all types of Join, Sub-Query and View. -------------------------------------------------------------------------------- ------------------------------- ##Sub-Query mysql> select * from emp; +-------+--------+-----------+------+------------+---------+---------+--------+ | empno | ename | job | mgr | hiredate | sal | comm | deptno | +-------+--------+-----------+------+------------+---------+---------+--------+ | 7369 | SMITH | CLERK | 7902 | 1980-12-17 | 800.00 | NULL | 20 | | 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 | | 7521 | WARD | SALESMAN | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 | | 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 | | 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 | | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 | | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 | | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 | 3000.00 | NULL | 20 | | 7839 | KING | PRESIDENT | NULL | 1981-11-17 | 5000.00 | NULL | 10 | | 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 | | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 | 1100.00 | NULL | 20 | | 7900 | JAMES | CLERK | 7698 | 1981-12-03 | 950.00 | NULL | 30 | | 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 | | 7934 | MILLER | CLERK | 7782 | 1982-01-23 | 1300.00 | NULL | 10 | +-------+--------+-----------+------+------------+---------+---------+--------+ 14 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno= (select deptno from emp where ename="SMITH"); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 5 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno= (select deptno from emp where ename="SMITH") and ename<>"SMITH"; +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 4 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno= (select deptno from emp where ename="SMITH"); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 |
  • 2. | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 5 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal> (select sal from emp where ename="SMITH"); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 | | FORD | 3000.00 | 20 | | MILLER | 1300.00 | 10 | +--------+---------+--------+ 13 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal> (select sal from emp where ename="SMITH") and ename<>"SMITH"; +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 | | FORD | 3000.00 | 20 | | MILLER | 1300.00 | 10 | +--------+---------+--------+ 13 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal in(select sal from emp where ename="SMITH" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | SCOTT | 3000.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 3 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal in(select sal from emp where ename="SMITH" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+
  • 3. | SMITH | 800.00 | 20 | | SCOTT | 3000.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 3 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno in(select deptno from emp where ename="SMITH" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | SCOTT | 3000.00 | 20 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 5 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno in(select deptno from emp where ename="SMITH" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | SMITH | 800.00 | 20 | | JONES | 2975.00 | 20 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | ADAMS | 1100.00 | 20 | | FORD | 3000.00 | 20 | | MILLER | 1300.00 | 10 | +--------+---------+--------+ 8 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ALL(select deptno from emp where ename="SMITH" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | TURNER | 1500.00 | 30 | | JAMES | 950.00 | 30 | +--------+---------+--------+ 6 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ANY(select deptno from emp where ename="SMITH" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | SMITH | 800.00 | 20 | | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | SCOTT | 3000.00 | 20 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 |
  • 4. | FORD | 3000.00 | 20 | +--------+---------+--------+ 11 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ANY(select deptno from emp where ename="TURNER" OR ename="MILLER" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | SMITH | 800.00 | 20 | | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | JONES | 2975.00 | 20 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | SCOTT | 3000.00 | 20 | | TURNER | 1500.00 | 30 | | ADAMS | 1100.00 | 20 | | JAMES | 950.00 | 30 | | FORD | 3000.00 | 20 | +--------+---------+--------+ 11 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > ANY(select deptno from emp where ename="TURNER" OR ename="SCOTT" ); +--------+---------+--------+ | ename | sal | deptno | +--------+---------+--------+ | ALLEN | 1600.00 | 30 | | WARD | 1250.00 | 30 | | MARTIN | 1250.00 | 30 | | BLAKE | 2850.00 | 30 | | TURNER | 1500.00 | 30 | | JAMES | 950.00 | 30 | +--------+---------+--------+ 6 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where deptno > all(select deptno from emp where ename="TURNER" OR ename="SCOTT" ); Empty set (0.00 sec) mysql> select ename,sal,deptno from emp where sal > ANY(select sal from emp where ename="TURNER" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | ALLEN | 1600.00 | 30 | | JONES | 2975.00 | 20 | | BLAKE | 2850.00 | 30 | | CLARK | 2450.00 | 10 | | SCOTT | 3000.00 | 20 | | KING | 5000.00 | 10 | | FORD | 3000.00 | 20 | +-------+---------+--------+ 7 rows in set (0.00 sec) mysql> select ename,sal,deptno from emp where sal > ALL(select sal from emp where ename="TURNER" OR ename="SCOTT" ); +-------+---------+--------+ | ename | sal | deptno | +-------+---------+--------+ | KING | 5000.00 | 10 | +-------+---------+--------+
  • 5. 1 row in set (0.00 sec) mysql> select ename,deptno from emp where deptno=(select deptno from dept where dname="RESEARCH"); +-------+--------+ | ename | deptno | +-------+--------+ | SMITH | 20 | | JONES | 20 | | SCOTT | 20 | | ADAMS | 20 | | FORD | 20 | +-------+--------+ 5 rows in set (0.00 sec) ##Jion mysql> create table orange(o_id varchar(20),price int(12)); Query OK, 0 rows affected (0.35 sec) mysql> create table apple(a_id varchar(20),price int(12)); Query OK, 0 rows affected (0.06 sec) mysql> insert into orange values("O1",50),("O2",60); Query OK, 2 rows affected (0.30 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> insert into apple values("A1",60),("A2",60); Query OK, 2 rows affected (0.30 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> select * from apple; +------+-------+ | a_id | price | +------+-------+ | A1 | 60 | | A2 | 60 | +------+-------+ 2 rows in set (0.00 sec) mysql> select * from orange; +------+-------+ | o_id | price | +------+-------+ | O1 | 50 | | O2 | 60 | +------+-------+ 2 rows in set (0.00 sec) mysql> select * from orange,apple; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O1 | 50 | A1 | 60 | | O2 | 60 | A1 | 60 | | O1 | 50 | A2 | 60 | | O2 | 60 | A2 | 60 | +------+-------+------+-------+ 4 rows in set (0.00 sec) mysql> select * from orange o inner join apple a on o.price=a.price; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+
  • 6. | O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | +------+-------+------+-------+ 2 rows in set (0.04 sec) mysql> select * from orange o left outer join apple a on o.price=a.price; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | | O1 | 50 | NULL | NULL | +------+-------+------+-------+ 3 rows in set (0.00 sec) mysql> select * from orange o right outer join apple a on o.price=a.price; +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | +------+-------+------+-------+ 2 rows in set (0.00 sec) mysql> (select * from orange o left outer join apple a on o.price=a.price) union(select * from orange o right outer join apple a on o.price=a.price); +------+-------+------+-------+ | o_id | price | a_id | price | +------+-------+------+-------+ | O2 | 60 | A1 | 60 | | O2 | 60 | A2 | 60 | | O1 | 50 | NULL | NULL | +------+-------+------+-------+