Question

I have the following columns in a table tbl:

    OrderID:     Parent:     Child:
    1              1           1
    2              2           1
    3              1           2
    4              1           1
    5              2           1

I wanted to get the current (OrderID,Parent,Child) and the LOWER (OrderID,Parent,Child) WHERE Parent and Child is equal to the current OrderID’s Parent and Child.

So, for example if I have a query for OrderID=4 the result should be the following:

OrderID:  Parent:    Child:
4            1         1
1            1         1

and if OrderID=5

OrderID:  Parent:    Child:
5           2           1
2           2           1

BTW, I can do this in PHP but I wanted to do it in a single query.

Answer 1

Okay, thanks all for your replies but I got my own answer.

SELECT a.OrderID,a.Parent,a.Child FROM tbl a 
JOIN (SELECT OrderID,Parent,Child FROM tbl WHERE OrderID={$OrderID}) b 
ON a.Parent=b.Parent 
AND a.Child=b.Child 
WHERE a.OrderId<=b.OrderID 
ORDER BY OrderID 
DESC LIMIT 2