Advanced Joins Video Tutorial - SQL ~ NIIT POST

Advanced Joins - Part 13

In this video session we will learn about
1. Advanced or intelligent joins in SQL Server
2. Retrieve only the non matching rows from the left table
3. Retrieve only the non matching rows from the right table
4. Retrieve only the non matching rows from both the left and right table

Before watching this video, please watch Part 12 - Joins in SQL Server




Considers Employees (tblEmployee) and Departments (tblDepartment) tables

Employee Table (tblEmployee)


Departments Table (tblDepartment)


How to retrieve only the non matching rows from the left table. The output should be as shown below:


Query:
SELECT       Name, Gender, Salary, DepartmentName
FROM           tblEmployee E
LEFT JOIN   tblDepartment D
ON                 E.DepartmentId = D.Id
WHERE        D.Id IS NULL



How to retrieve only the non matching rows from the right table 


Query:
SELECT         Name, Gender, Salary, DepartmentName
FROM             tblEmployee E
RIGHT JOIN    tblDepartment D
ON                   E.DepartmentId = D.Id
WHERE          E.DepartmentId IS NULL



How to retrieve only the non matching rows from both the left and right table. Matching rows should be eliminated.


Query:
SELECT         Name, Gender, Salary, DepartmentName
FROM              tblEmployee E
FULL JOIN      tblDepartment D
ON                   E.DepartmentId = D.Id
WHERE          E.DepartmentId IS NULL
OR                   D.Id IS NULL

by :- kudvenkat