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7. Which SELECT statement implements a self join?
SELECT item.part_id, type.product_id
FROM part item JOIN product type
ON item.part_id =! type.product_id;
SELECT item.part_id, type.product_id
FROM part item JOIN product type
ON item.part_id = type.product_id;
SELECT item.part_id, type.product_id
FROM part item JOIN part type
ON item.part_id = type.product_id;
SELECT item.part_id, type.product_id
FROM part item JOIN product type
ON item.part_id = type.product_id (+);​

Sagot :

Answer:

SELECT item.part_id, type.product_id

FROM part item JOIN part type

ON item.part_id = type.product_id;

Explanation:

A self join is when a table joins to itself, in the above answer the part joins itself, note in bold below

   FROM part item JOIN part type

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