Remember : A join between v$esssion and v$sql% views will return rows only *IF* the toad session is *CURRENTLY* running a query ; not if it has already run a query even a second ago.
If you want all the queries run by a toad session, you need to enable sql tracing of the session so that the queries are captured to a trace file.
Hemant K Chitale
Do you want to track all the sql queries for sessions logged in using toad ?
In that case you will have to check go for SQL tracing. Please use this with caution on Production database. Please refer below document for the same.