projection from a query

Question

i am trying to write a query that would do the following on the view update_winnerlist which is already GROUPed BY item_index

SELECT email_id (SELECT email_id,min(bid_amount) FROM update_winnerslist AS a1 WHERE a1.item_index = 10 )

i need to perform the above in a single query as i am using it in a trigger to update a table.

Answer 1

@heboy1908 I did not understand your requirement properly. But if you want to hit your table only once then the following could be what you want

SELECT email FROM
(
SELECT email_id, bid_amount, ROW_NUMBER() OVER (ORDER BY bid_amount) ROWNUM
FROM update_winnerslist AS a1 WHERE a1.item_index = 10 
) MinBidAmount
WHERE [ROWNUM] = 1

Moreover, please keep in mind that there could be ties for the bid amount and if you are doing it in the trigger, you may need to get a random choice or whatever the requirement is. For that the TOP clause may be helpful.

PS: RANK() function could be used as well instead of ROW_NUMBER()

projection from a query

Follow this question

Related Questions