Right Join in SQL

July 23, 2019

Right join in SQL


Join enables data merging from tables i.e used to query data from multiple tables

How right join works

  • Right Join always Returns all rows from the right table
    Matching records from the left side table
  • Null values in the place of non-matching rows in another table

Syntax

select col1,col2.... 
from 
tab1 
RIGHT JOIN 
tab2 
on tab1.colname=tab2.colname
Right Join in SQL

Right Join Example

Consider two tables emp and dept table Emp table
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7839 KING PRESIDENT – 17-NOV-81 5000 – 10
7698 BLAKE MANAGER 7839 01-MAY-81 2850 – 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 – 10
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
7369 SMITH CLERK 7902 17-DEC-80 800 – 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 – 20
7900 JAMES CLERK 7698 03-DEC-81 950 – 30
7934 MILLER CLERK 7782 23-JAN-82 1300 – 10
Dept table
DEPTNO DNAME LOC
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON

Right join SQL query

select ename,sal,d.deptno,dname,loc
from 
emp e 
RIGHT outer join
dept d
on e.deptno=d.deptno;
O/P
ROWNUM ENAME SAL DEPTNO DNAME LOC
1 KING 5000 10 ACCOUNTING NEW YORK
2 BLAKE 2850 30 SALES CHICAGO
3 CLARK 2450 10 ACCOUNTING NEW YORK
4 JONES 2975 20 RESEARCH DALLAS
5 SCOTT 3000 20 RESEARCH DALLAS
6 FORD 3000 20 RESEARCH DALLAS
7 SMITH 800 20 RESEARCH DALLAS
8 ALLEN 1600 30 SALES CHICAGO
9 WARD 1250 30 SALES CHICAGO
10 MARTIN 1250 30 SALES CHICAGO
11 TURNER 1500 30 SALES CHICAGO
12 ADAMS 1100 20 RESEARCH DALLAS
13 JAMES 950 30 SALES CHICAGO
14 MILLER 1300 10 ACCOUNTING NEW YORK
15 – – 40 OPERATIONS BOSTON