[Solved] How to perform complex join on three tables [closed]

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This should do it. If CategoryNAME coming back as null, then you’re doing a LEFT OUTER join and have referential integrity issues.

CREATE PROCEDURE usp_OrderDetails_SelectByOrderId
@OrderID INT
AS
BEGIN
    SELECT P.ProductId,
           OD.Qty,
           P.Price,
           C.NAME AS CategoryNAME
    FROM tblProducts P
    INNER JOIN tblCategories C ON P.CategoryId = C.CategoryId
    INNER JOIN tblOrderDetails OD ON P.ProductId = OD.ProductId
    INNER JOIN tblOrders O ON OD.OrderId = O.OrderId
    WHERE O.OrderId = @OrderId
END

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solved How to perform complex join on three tables [closed]