[chudok01]

I have a previously designed Access DB and there is a query that I am trying to understand. It has several tables that are queried more than once in a single query. First how do I determine the actual table name? I can only see the alias name. Also what is the purpose of using the same table twice in a query?

[OBP]

It is normally to do calculations or comparisons on prior or next records. It is the one weekness of Access Queries, the Totals function has some good arithmetic calculations like average, Count Sum etc but manipulating previous records like add or subtract values from the current record it can't do. So it requires more advanced SQl. Which is apperas you have.
Have you looked at the query in SQL view?
It should use the word "As" to designate the alias.

[chudok01]

Got it! Thanks!!