SQL getting started Tutorial: SQL FULL JOIN keyword usage tutorial
SQL FULL JOIN keyword
When a fully connected keyword is returned, the returned row is a table in the competition.
SQL syntax
SELECT column_name(s)FROM table_name1FULL JOIN table_name2 ON table_name1.column_name=table_name2.column_name
Let's look at an example.
P_Id |
LastName |
FirstName |
Address |
City |
1 |
Hansen |
Ola |
Timoteivn 10 |
Sandnes |
2 |
Svendson |
Tove |
Borgvn 23 |
Sandnes |
3 |
Pettersen |
Kari |
Storgt 20 |
Stavanger |
The "Orders" table:
O_Id |
OrderNo |
P_Id |
1 |
77895 |
3 |
2 |
44678 |
3 |
3 |
22456 |
1 |
4 |
24562 |
1 |
5 |
34764 |
15 |
Now, we want to list all personnel and their orders, all orders with their persons.
We use the following SELECT statement:
SELECT Persons.LastName, Persons.FirstName, Orders.OrderNoFROM PersonsFULL JOIN OrdersON Persons.P_Id=Orders.P_IdORDER BY Persons.LastName
LastName |
FirstName |
OrderNo |
Hansen |
Ola |
22456 |
Hansen |
Ola |
24562 |
Pettersen |
Kari |
77895 |
Pettersen |
Kari |
44678 |
Svendson |
Tove |
|
|
|
34764 |
The full join keyword returns all rows from the table (person) on the left, and all rows from the right table (order ). If there are "orders" listed in "persons" that do not match ",
Or are there "people" listed in "command" without a match, these lines are well listed.