The SQL RIGHT JOIN keyword returns all rows from the RIGHT table, even if there are no matches in the LEFT table.
In this example, employeeID is a primary key in the table called "Employees". You'll notice that employeeID also exists in the "Departments" table, but as a foreign key.
Using an SQL Join, we can combine these two tables into one when presenting the results of a query.
In this example, using a RIGHT JOIN, we can build a query to display the departments and employees even though not every employee is assigned to a department, such as in the case of 'Fred White'.
The two tables are joined by the 'employeeID' field.
We can use the RIGHT JOIN to bind this data together.
SELECT tableName#.columnName#, tableName#.columnName#, etc...|
RIGHT JOIN tableName2
ON tableName1.columnName# = tableName2.columnName#
List the departments and their assigned employees.
SELECT Departments.deptName, Employees.employeeName |
RIGHT JOIN Employees
ON Departments.employeeID = Employees.employeeID
| ||Fred White|
You should immediately notice that 'Fred White' from the Employees table is
This is because there is there is no department assigned to 'Fred White' and we had
specific a RIGHT JOIN in the query.
If there are rows in "Departments" that do not have matches in "Employees", the
records from Employees will be returned in the result set.
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