Question

Please go thourgh Attached Image where i descirbed my scenario:

I want SQL Join query.

Answer 1

Have a look at something like

SELECT  *
FROM    Orders o    
WHERE   EXISTS  (
                    SELECT  1
                    FROM    OrderBooks ob INNER JOIN
                            Books b ON  ob.BookID = b.BookID
                    WHERE   o.OrderID = ob.OrderID
                    AND     b.IsBook = @IsBook
                )

The query will return all orders based on the given criteria.

So, what it does is, when @IsBook = 1 it will return all Orders where there exists 1 or more entries linked to this order that are Books. And if @IsBook = 0 it will return all Orders where there exists 1 or more entries linked to this order that are not Books.