Here we are going to Join 2 Tables and Retrieve the data.
There are two Tables "Employees" and "Department", these two tables will be joined using the Inner Join Clause.
Below is shown the "Employees" table:
| 1 |
Richard Hughes |
4/23/1945 12:00:00 AM |
1 |
1 |
343-123-2002 |
New Orleans |
950.00 |
| 2 |
Taryn Sinclair |
3/22/1980 12:00:00 AM |
2 |
2 |
232-344-8755 |
San Francisco |
800.00 |
| 3 |
Ted Horowitz |
3/31/1960 12:00:00 AM |
3 |
4 |
435-657-9068 |
New York |
700.00 |
| 4 |
Jonathan Douglas |
7/7/1971 12:00:00 AM |
3 |
4 |
323-454-7656 |
Salt Lake City |
600.00 |
| 5 |
Miranda Leigh |
7/19/1983 12:00:00 AM |
7 |
3 |
634-465-8046 |
New York |
500.00 |
| 6 |
Jana Rae |
9/23/1976 12:00:00 AM |
8 |
2 |
434-434-1254 |
Houston |
400.00 |
| 7 |
Lita Rosanna |
9/14/1982 12:00:00 AM |
4 |
6 |
565-782-1223 |
Long Island |
650.00 |
| 8 |
Colin Flooks |
12/29/1988 12:00:00 AM |
4 |
2 |
954-652-2111 |
Salt Lake City |
600.00 |
| 9 |
Anthony Frank |
2/22/1988 12:00:00 AM |
9 |
3 |
323-243-1249 |
San Francisco |
750.00 |
| 10 |
Stephanie Lynn |
7/30/1979 12:00:00 AM |
8 |
2 |
543-765-4653 |
Salt Lake City |
450.00 |
| 11 |
Jack Martin |
8/25/1985 12:00:00 AM |
NULL |
NULL |
443-324-6522 |
Austin |
500.00 |
Below is shown the "Department" table:
| 1 |
Finance |
| 2 |
Development |
| 3 |
Testing |
| 4 |
Delivery |
| 5 |
Human Resources |
| 6 |
Administration |
In the table named "Employees", Column DeptID is the Foreign Key.
In the table named "Department", Column ProductID is the Primary Key.
The data about the Department Name is available in "Department" table in the DeptName Column.
It is not available in "ProductDeliveryTBL" table.
To get the Employee data along with Department Name using SQL, we have to use column "DeptID", which is a common column in both the tables. Need to
use this column "DeptID" to do Inner Join between the tables "Employees" and "Department".
The following SQL query acheives the above said task.
Text Editor below has the SQL Query, click the "View Result" button, to see the result.
Select Employees.EmployeeID, Employees.EmployeeName, Employees.DeptID, Department.DeptName
From Employees
INNER JOIN Department on Employees.DeptID = Department.DeptID;
Note: For every DeptID in the Employees, the correct DeptName is retrieved.