JOINs would be very useful for creating more advanced reports.
Example query:
SELECT account, bal1, bal2 FROM
(SELECT account, sum(cost(position)) as bal1
FROM CLOSE ON 2014-01-01 CLEAR)
JOIN
(SELECT account, sum(cost(position)) as bal2
FROM CLOSE ON 2015-01-01 CLEAR)
ON account;
JOIN
s would be very useful for creating more advanced reports.Example query: