CHASM trap and FAN trap

While designing universe, a situation occurs when loops and traps occurs. What is CHASM trap and a FAN trap?

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eussusn24

  • Jul 6th, 2010
 

Chasm trap is type of join path between 3 tables. When two many-to-0ne join converges to a single table and there is no context  in place to separate the converging paths.

Fan trap is another type of join path between 3 tables, where a one-to-many join links a table which in turn is linked by another one-to-many join.

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