Answer Posted / prasanna.ramesh1

chasm trap::
sale
client< rental


chasm trap is a type is a type of join path between 3 tables
when 2 many to one joins converge on single table.

fan trap::

when one table has one -to-many join that "fans out" into
other "one-to-many" join for other table.is fan trap.

a--->b--->

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