fan trap and trap of the abyss

Hello Experts;

I tried playback on the following terms, but I'm still not clear about this... Can someone help explain and give examples of what trap a fan trap and the chasm is. Thank you

Hello

Both involve 3 entities, linked by parent-child relationships (i.e., one-to-many).

A chasm trap has a parent with 2 children (brothers and sisters).

A fan trap has a parent, a child and a grandchild.

Another way to put it is that you have 3 tables A, B and c: A is related to B, and B is related to C.

A chasm trap occurs when B is the parent of both A and C (that is, each row of B can be connected to several lines in A, and it can also be linked to several lines of C.)

A fan ioccurs trap when B is the parent of one of the other tables, but the child of the other.

See http://everythingoracle.com/obieefanch.htm

WARNING: Some people reverse the above definitions.  Some people use even these words to choose the type of relationship, indiscriminantly.  Be careful when playing using these terms.

Tags: Database

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