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Answer Posted / pandian raman
Inner Join (simple join)
Inner joins return all rows from multiple tables where the
join condition is met.
For example,
SELECT suppliers.supplier_id, suppliers.supplier_name,
orders.order_date FROM suppliers, orders
WHERE suppliers.supplier_id = orders.supplier_id;
This SQL statement would return all rows from the suppliers
and orders tables where there is a matching supplier_id
value in both the suppliers and orders tables.
Outer Join
This type of join returns all rows from one table and only
those rows from a secondary table where the joined fields
are equal (join condition is met).
For example,
select suppliers.supplier_id, suppliers.supplier_name,
orders.order_date from suppliers, orders where
suppliers.supplier_id = orders.supplier_id(+);
This SQL statement would return all rows from the suppliers
table and only those rows from the orders table where the
joined fields are equal.
The (+) after the orders.supplier_id field indicates that,
if a supplier_id value in the suppliers table does not exist
in the orders table, all fields in the orders table will
display as <null> in the result set.
The above SQL statement could also be written as follows:
select suppliers.supplier_id, suppliers.supplier_name,
orders.order_date from suppliers, orders where
orders.supplier_id(+) = suppliers.supplier_id
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