Count(*) as inside a JOIN on SQL Query - mysql

Question

I have the following query for a report all is working fine, but I need to add a variable in the report that totals up the number of records for each record returned based off the number of records in the "manheim_auction_listings" record. I feel like it needs to be inside a join but everywhere I would the "COUNT(*) AS num_of_runs" it seems to make the whole query only return a single line with the count the total number of records in the query rather than all the lines with a variable num_of_runs with the number of "manheim_auction_listings" records for each CAR record.
SELECT products.client_id,
clients.name AS client_name,
manheim_auction_lanes.lane_number,
manheim_auction_listings.sequence,
manheim_auction_listings.gross_sale_price,
products.asking_price, products.asking_price_condition,
manheim_auctions.auction_date,
manheim_auctions.auction_number,
product_purchases.total_spent,
product_purchases.purchase_price
FROM manheim_auction_listings
JOIN cars ON
cars.id = manheim_auction_listings.car_id
JOIN products ON
cars.product_id = products.id
JOIN product_purchases ON
current_product_purchase_id = product_purchases.id
JOIN manheim_auctions ON
manheim_auctions.id = manheim_auction_listings.manheim_auction_id
JOIN manheim_auction_lanes ON
manheim_auction_lanes.id = manheim_auction_listings.manheim_auction_lane_id
JOIN clients ON
clients.id = products.client_id
AND clients.id LIKE $P{LoggedInUserAttribute_ClientID}
WHERE
manheim_auctions.auction_number = $P{SaleNumber}
AND manheim_auctions.`year` = $P{SaleYear}
ORDER BY manheim_auction_lanes.lane_number DESC,
manheim_auction_listings.sequence DESC

Answer 1

Please try the following...
SELECT products.client_id,
clients.name AS client_name,
manheim_auction_lanes.lane_number,
manheim_auction_listings.sequence,
manheim_auction_listings.gross_sale_price,
num_of_runs,
products.asking_price, products.asking_price_condition,
manheim_auctions.auction_date,
manheim_auctions.auction_number,
product_purchases.total_spent,
product_purchases.purchase_price
FROM ( SELECT manheim_auction_id AS manheim_auction_id,
COUNT( manheim_auction_id ) AS num_of_runs
FROM manheim_auction_listings
GROUP BY manheim_auction_id
) AS num_of_runs_finder
JOIN manheim_auction_listings ON manheim_auction_listings.manheim_auction_id = num_of_runs.manheim_auction_id
JOIN cars ON cars.id = manheim_auction_listings.car_id
JOIN products ON cars.product_id = products.id
JOIN product_purchases ON current_product_purchase_id = product_purchases.id
JOIN manheim_auctions ON manheim_auctions.id = manheim_auction_listings.manheim_auction_id
JOIN manheim_auction_lanes ON manheim_auction_lanes.id = manheim_auction_listings.manheim_auction_lane_id
JOIN clients ON clients.id = products.client_id
AND clients.id LIKE $P{LoggedInUserAttribute_ClientID}
WHERE manheim_auctions.auction_number = $P{SaleNumber}
AND manheim_auctions.`year` = $P{SaleYear}
ORDER BY manheim_auction_lanes.lane_number DESC,
manheim_auction_listings.sequence DESC
This works by joining your other tables to one that calculates the number of listings associated with each manheim_auction_id, effectively appending a manheim_auction_id's count to each row where that manheim_auction_id occurs.
If num_of_runs is calculated on some other criteria, then please advsie me accordingly.
If you have any questions or comments, then please feel free to post a Comment accordingly.