Advanced Joins

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

Considers Employees (tblEmployee) and Departments (tblDepartment) tables

Employee Table (tblEmployee)

Departments Table (tblDepartment)

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