Can u please describe the different types of traps with eg.
Thanks
- 2 Answers
- 8384 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / the_xxx
There are two main types of connection traps:
1. fan traps
2. chasm traps
Fan traps
A fan trap occurs when a model represents a relationship
between entity types, but the pathway between certain entity
occurrences is ambiguous. It occurs when 1:m relationships
fan out from a single entity.
Missing ALT text
Figure : Fan Trap
A single site contains many departments and employs many
staff. However, which staff work in a particular department?
The fan trap is resolved by restructuring the original ER
model to represent the correct association.
Missing ALT text
Figure : Resolved Fan Trap
Chasm traps
A chasm trap occurs when a model suggests the existence of a
relationship between entity types, but the pathway does not
exist between certain entity occurrences.
It occurs where there is a relationship with partial
participation, which forms part of the pathway between
entities that are related.
Missing ALT text
Figure : Chasm Trap
* A single branch is allocated many staff who oversee
the management of properties for rent. Not all staff oversee
property and not all property is managed by a member of staff.
* What properties are available at a branch?
* The partial participation of Staff and Property in the
oversees relation means that some properties cannot be
associated with a branch office through a member of staff.
* We need to add the missing relationship which is
called `has' between the Branch and the Property entities.
* You need to therefore be careful when you remove
relationships which you consider to be redundant.
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / divakar
There will be traps w.r.t query joins in FM. They are when
1. there is infinite relation existing between query
subjects like A->B->C->A
2. there is ambiguous relationship(No proper relationship)
Then there will be traps while running the query or w.r.t.
data.
| Is This Answer Correct ? | 1 Yes | 0 No |
What is defined as data mining?
Can you define report item?
how to merge 2 crosstabs thans
what is the difference b/w mdx and sql?
how to do page breaks in cognos 8 Report studio pls give the navigation
pls help me out to find a projects for attending cognos interviews pls anybody send me projects with detail description to explain at the interview time pls send me real time project anybody pls mail me at kittuchoudary2007@gmail.com
we have package it contain Query subject (123456). If u generate report with 6 query subject error will occure how to resolve this problem
what is an outer join? difference between left outer join right outer join with an example?
what is the diffence between render variable & style variable with egs? Plz reply ASAP
what is the difference between list sequel and cross tab sequel?
Can someone tell me whether we can apply filter on list of values in the 'Value Prompt'? e.g. I have a value prompt (named city) and the prompting is holding around 2000 cities but I want to apply filters on cities so users can select only 15 cities out of 2000 and then run the report. Users should be flexible enought to select any 15 cities from the list. Is it possible. Please advice!
What are shortcuts? Where it can be used? What are the advantages?
Teradata 
