Excuse me if this is a very basic question. I have tried to find it in the docs and forums but I didn't see anything.

Can I have a field in Zoho Creator that counts the number of related records in a different table? If each record in table A has a lookup field connecting it to a record in table B, can I have a field in B, automatically updated, with the count of related records in A?

What about other rollup functions like most recent, oldest, sum, average, etc.?

If not, can it be done with Deluge?

thanks!