How do you find what type of trap is there by seeing the
report?
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Answer / sj
We can find out Chasm trap and Fan trap by just viewing the
table schema.
If we have many to one to many relationship between three
tables that is a chasm trap.
If we have one to many,one to many relationship between
three tables that wil be a fan trap.
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / tarukhemu
Consider you have one dimension linked to two fact tables. One fact contains branch wise revenue and another fact contains branch wise sales. For example:
Fact 1: Branch Revenue
101 1000
201 2000
201 1500
Fact 2: Branch Sales
101 5
201 10
Now if you want to display Branch,Revenue as well as sales,then the data in report will appear as follows:
Branch Revenue Sales
101 1000 5
201 2000 10
201 1500 10
As per Fact 2,Branch 201 has Sales=10,but in report it displays Sales as 10+10=20,which is wrong.
Hence by looking at the report data,you can identify a trap.
Note: This is a case of Chasm Trap
| Is This Answer Correct ? | 2 Yes | 1 No |
by viewing we can define weather it is fan trap or chasm trap
Fan trap: When three tables were joined in one to many relationship then it is fan trap.
Chasm trap: when two fact tables depend upon the same lookup table then it is known as chasm trap.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / pradiip
As per my understanding we can find the traps only by the cardinalities of the present tables and the other best way is 'Detect Context' because if there is more then one way/Context to achieve the results definitely there is a trap. it may be Chasm or Fan.
| Is This Answer Correct ? | 0 Yes | 0 No |
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