SQL FULL Outer Join

SQL Full Join (Full Outer Join) always contains all records of left table (Table A) and right table (Table B) even of join condition does not find any matching record in both left or right table. Returned result contains set NULL value for all column that are lack of value in matching rows.

SQL FULL Join


Example Table

Considering following SQL left join example, category, product is our example table.

SQL> SELECT * FROM category;
CATEGORY_IDCATEGORY_NAME
1Mobiles
2Laptops
3Laptops
4Cameras
5Gaming
SQL> SELECT * FROM product;
CATEGORY_IDPRODUCT_NAME
1Nokia
1Samsung
2HP
2Dell
3Apple
4Nikon
NullPlaystation

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Example

SQL> SELECT *
    FROM product FULL OUTER JOIN category
    ON product.category_id = category.category_id;

CATEGORY_ID PRODUCT_NAME              CATEGORY_ID CATEGORY_NAME
----------- ------------------------- ----------- -------------------------
          1 Samsung                             1 Mobiles
          1 Nokia                               1 Mobiles
          2 Dell                                2 Laptops
          2 HP                                  2 Laptops
          3 Apple                               3 Tablet
          4 Nikon                               4 Cameras
       NULL Playstation                      NULL NULL
       NULL NULL                                5 Gaming

8 rows selected.

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