sqlite return subquery multi column - sql

Question

I have a sqlite subquery with the following query which is calculating the hours and labour_rate. The only issue I now have is can I get the two columns from my subquery to output in the main query. I've tried to layout the query according to some of the web tutorials but need that little bit of help to get me over the finish line as I keep getting a syntax error
SELECT c.customerID, c.customer, sum( ifnull(il.line_price, 0 ) )/10000 AS net,
FROM customer AS c
LEFT JOIN invoice AS i
ON c.customerID = i.customerID
LEFT JOIN invoice_line AS il
ON i.invoiceID = il.invoiceID
(SELECT sum(( ifnull(tl.mon,0) + ifnull(tl.tues,0) + ifnull(tl.wed,0) + ifnull(tl.thurs,0) + ifnull(tl.fri,0) + ifnull(tl.sat,0) + ifnull(tl.sun,0) ) * s.cost_rate)/10000 AS labour_rate,
sum(( ifnull(tl.mon,0) + ifnull(tl.tues,0) + ifnull(tl.wed,0) + ifnull(tl.thurs,0) + ifnull(tl.fri,0) + ifnull(tl.sat,0) + ifnull(tl.sun,0) ))/10000 AS
FROM timesheet_line AS tl
LEFT JOIN timesheet AS t
ON tl.timesheetID = t.timesheetID
LEFT JOIN staff AS s
ON t.staffID = s.staffID
WHERE (c.customerID = tl.customerID) AND (t.date BETWEEN '2014-03-01' AND '2015-12-01')
GROUP BY tl.customerID) AS time1
WHERE (i.date BETWEEN '2014-03-01' AND '2015-12-01') AND (time1.customerID = tl.customerID)
GROUP BY c.customerID
ORDER BY c.customer ASC

Answer 1

There are a few syntax errors in here. The first (and possibly most important) is you have to JOIN your subquery to the rest of the result set. So after
LEFT JOIN invoice_line AS il
ON i.invoiceID = il.invoiceID
you will need to add another JOIN statement:
LEFT JOIN
(SELECT
SUM(...) AS labour_rate,
SUM(...) AS hours,
tl.customerID
FROM
...) AS time1
ON <your join condition>
You will have to select some sort of field in your sub query that you can join back to the the invoice on i.e. tl.customerID.
Also, in your subquery you cannot reference a field that is outside of it, so where you have WHERE (c.customerID = tl.customerID) in your subquery it will fail because you are trying to reference c.<fieldname>. It needs to be moved to the ON part of the JOIN clause. Once you get your JOIN working correctly then you can just change your outer-most SELECT to something like
SELECT c.customerID, c.customer, sum(ifnull(il.line_price,0))/10000 AS net, time1.labour_rate, time1.hours
Here's an example of how I would do it:
SELECT c.customerID, c.customer, sum( ifnull(il.line_price, 0 ) )/10000 AS net, time1.labour_rate, time1.[hours]
FROM customer AS c
LEFT JOIN invoice AS i
ON c.customerID = i.customerID
LEFT JOIN invoice_line AS il
ON i.invoiceID = il.invoiceID
LEFT JOIN
(SELECT
sum(( ifnull(tl.mon,0) + ifnull(tl.tues,0) + ifnull(tl.wed,0) + ifnull(tl.thurs,0) + ifnull(tl.fri,0) + ifnull(tl.sat,0) + ifnull(tl.sun,0) ) * s.cost_rate)/10000 AS labour_rate,
sum(( ifnull(tl.mon,0) + ifnull(tl.tues,0) + ifnull(tl.wed,0) + ifnull(tl.thurs,0) + ifnull(tl.fri,0) + ifnull(tl.sat,0) + ifnull(tl.sun,0) ))/10000 AS [hours],
tl.customerID
FROM timesheet_line AS tl
LEFT JOIN timesheet AS t
ON tl.timesheetID = t.timesheetID
LEFT JOIN staff AS s
ON t.staffID = s.staffID
WHERE (t.date BETWEEN '2014-03-01' AND '2015-12-01')
GROUP BY tl.customerID) AS time1
ON c.customerID = time1.customerID
WHERE (i.date BETWEEN '2014-03-01' AND '2015-12-01')
GROUP BY c.customerID
ORDER BY c.customer ASC