MySQL nested, nested subquery not getting outter variable - mysql

Question

I have a spendings table and a dates table, that are joined by date_id and id...
What I'm trying to do, is get from 1 query all the info from spendings, plus the sum of all the spendings but with a limit and/or offset
This is the query right now
SELECT spendings.id, spendings.price, spendings.title,
dates.date, users.username, currencies.value,
( SELECT SUM(sum_table.price)
FROM (
SELECT s.price
FROM spendings s, dates d
WHERE s.date_id = d.id
AND day(d.date) = 25
LIMIT 2 OFFSET 0
) as sum_table
) AS sum_price
FROM spendings, dates, users, currencies
WHERE spendings.date_id = dates.id
AND day(dates.date) = 25
AND spendings.user_id = users.id
AND spendings.curr_id = currencies.id
LIMIT 2 OFFSET 0
Output
id price title date username value sum_price
3 6.00 title1 2013-11-25 alex € 21.00
4 15.00 title2 2013-11-25 alex € 21.00
It works, but only if the date here day(d.date) = 25 is the same as the outer one here day(dates.date) = 25
If instead I put day(d.date) = day(dates.date) which seems the logic thing to do, I get #1054 - Unknown column 'dates.date' in 'where clause'
If anyone has an idea to make this simpler let me know :)

Answer 1

Try to join instead of using nested correlated subqueries:
SELECT spendings.id, spendings.price, spendings.title,
dates.date, users.username, currencies.value,
y.sum_price
FROM spendings, dates, users, currencies
JOIN (
SELECT day, SUM(sum_table.price) As sum_price
FROM (
SELECT day(d.date) As day,
s.price
FROM spendings s, dates d
WHERE s.date_id = d.id
AND day(d.date) = 25
LIMIT 2 OFFSET 0
) sum_table
GROUP BY day
) y
ON y.day = day(dates.date)
WHERE spendings.date_id = dates.id
-- AND day(dates.date) = 25 <== commented since it's redundant now
AND spendings.user_id = users.id
AND spendings.curr_id = currencies.id
Some remarks:
Using old join syntax with commas is not recommended: FROM table1,table2,table2 WHERE
The recommended way of expressing joins is "new" ANSI SQL join syntax:
FROM table1
[left|right|cross|[full] outer|natural] JOIN table2 {ON|USING} join_condition1
[left|right|cross|[full] outer|natural] JOIN table3 {ON|USING} join_condition2
....
Actually this "new syntax" is quite old now, since is has been published, as I remember, in 1992 - 22 years ago. In IT industry 22 years is like 22 ages.