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Can some one explain in detail about the following:
What are Traps?
How to recognize the Traps?
How to solve them?
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The are the causes for incorrect results in your reports.
There are two types of traps occurs in the universe, namely
chasm and fan traps.
chasm trap- it occurs when two many to one joins directs
from two fact tables and one end of the joins converges at
the same dimension table.
Because of this you will get inflatted results.
You user contexts to separate both the join paths to resolve
chasm traps.
Fan trap- it occurs when two one to many joins associates
with three tables in a series.
also effect the results same as chasm trap
you solve fan traps using aliases in general
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Teradata 
