Hi,

I was hoping someone can help out with some queries I'm trying to write.  
I'm trying to get the market value in certain currency of all positions in 
some account.  Closest I was able to get was from example page: 
http://aumayr.github.io/beancount-sql-queries/
SELECT account, units(sum(position)) AS quantity, cost(sum(position)) AS 
Book , convert(units(sum(position)), "CAD") AS Market FROM date > 
2018-01-01 AND date < 2018-01-31 WHERE account ~ "Assets:Margin" GROUP BY 
account ORDER BY account

Which produces something like below where A is some stock.
| account            | quantity | book    | market  |
| Assets:Margin:Cash | 1 CAD    | 1 CAD   | 1 CAD   |
| Assets:Margin:A    | 100 A    | 100 CAD | 105 CAD |

I was hoping to get a sum of all positions - the balance.  But can't figure 
out the query.  Furthermore one of the posts suggests that convert needs a 
date otherwise latest price is used 
(https://groups.google.com/forum/#!msg/beancount/qA9IKJ408tg/OFsN8G_wFgAJ) 
even with date query.  Is that still the case?

For withdrawal/deposit query I tried this as a starting point without 
aggregation:
SELECT account, position FROM date > 2018-01-01 AND date < 2018-01-31 WHERE 
account ~ "Assets:Margin:Cash" AND position > 0    

However received a stack dump (beancount 2.2.1):

Traceback (most recent call last):
  File "/usr/lib/python3.7/cmd.py", line 214, in onecmd
    func = getattr(self, 'do_' + cmd)
AttributeError: 'BQLShell' object has no attribute 'do_SELECT'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/beancount/query/shell.py", line 
271, in run_parser
    self.dispatch(statement)
  File "/usr/lib/python3.7/site-packages/beancount/query/shell.py", line 
251, in dispatch
    return method(statement)
  File "/usr/lib/python3.7/site-packages/beancount/query/shell.py", line 
419, in on_Select
    self.options_map)
  File "/usr/lib/python3.7/site-packages/beancount/query/query_execute.py", 
line 275, in execute_query
    if c_where is None or c_where(context):
  File "/usr/lib/python3.7/site-packages/beancount/query/query_compile.py", 
line 121, in __call__
    return self.operator(self.left(context), self.right(context))
  File "/usr/lib/python3.7/site-packages/beancount/query/query_compile.py", 
line 121, in __call__
    return self.operator(self.left(context), self.right(context))
TypeError: '>' not supported between instances of 'Position' and 'int'

The reason I'm working on these queries is I'd like to compute time valued 
rate of returns (example spreadsheet if someone's interested 
https://www.bogleheads.org/wiki/Calculating_personal_returns).  If anyone 
has suggestions on different workflow with beancount, please let me know. 

Thank you.

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