Question

I’m writing some reasonably complex queries for reporting for an app I am developing. I could probably achieve all of the following through using higher level PHP, but obviously I would like to get it all done with MySQL which will obviously simplify things greatly.

The report I need is a typical sales report type query, which will list a list of people, and some relevant totals relating to them. The only minor difference is that this system relates to freight/haulage, so the “sales people” are actually lorry drivers, and the “sales” are individual consignments. Also, consignments are only linked/tied to their respective driver through the creation of “routes”, which record who delivers/collects what on a specific day.

Naturally, I could use an INNER JOIN to get a list of each driver, with all of the consignments they have delivered/collected, and SUM the revenue made off these. The problem comes however, when I need to show both a column for total delivery revenue and collection revenue. These figures can come from a consignments table, which lists every consignment. Each consignment can have a flag (ENUM “D”,”C”) which donates whether it is a delivery or collection. This can almost be ascertained easily through using sub queries but still, there will be a lot of repetition.

What I have so far:

SELECT pr.driver_callsign, d.first_name, d.last_name, sum(pc.revenue) AS total_revenue
FROM pallet_routes AS pr
INNER JOIN drivers AS d ON d.driver_callsign = pr.driver_callsign
INNER JOIN pallet_consignments AS pc ON pc.route_id = pr.route_id
GROUP BY pr.driver_callsign
ORDER BY d.driver_callsign ASC

This obviously returns a list of each driver, with the total amount of revenue made from all consignments they have tied to them.

What would be the most efficient way to further split this revenue SUM field up to show a SUM(revenue) WHERE type = "C" and SUM(revenue) WHERE type="D"? Subqueries? UNION?

It may also be worth mentioning that the end query will be narrowed down to a date range. So for example there will be a WHERE date BETWEEN x AND y put against the pallet_routes table.

Any advice would be greatfully received. Please do ask if you want me to elaborate more.

Answer 1

I don’t know where your column type is, but if it’s on pallet_consignments, you can try the following:

SELECT pr.driver_callsign, d.first_name, d.last_name, 
SUM(IF(pc.`type` = 'C', pc.revenue, 0)) collection_revenue,
SUM(IF(pc.`type` = 'D', pc.revenue, 0)) delivery_revenue
FROM pallet_routes AS pr
INNER JOIN drivers AS d ON d.driver_callsign = pr.driver_callsign
INNER JOIN pallet_consignments AS pc ON pc.route_id = pr.route_id
GROUP BY pr.driver_callsign
ORDER BY d.driver_callsign ASC

Otherwise, please mention where the column type is.