How the facts will be loaded? explain
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Answer / naveen kumar reddy
LOADING FACTS
The most important thing about loading fact tables is that
first you need to load dimension tables and then according
to the specification the fact tables.
The fact table is often located in the center of a star
schema, surrounded by dimension tables. It has two types of
columns: those containing facts and other containing foreign
keys to dimension tables.
* A typical fact table consists of: Measurements:
additive-measures that can be added across all dimensions ,
non-additive cannot be added and semi-additive can be added
across few dimensions.
* Metrics
* Facts - The fact table has frequently more than one
measurement field and then each field is called a fact.
Usually one fact table has at least three dimension tables.
Note:
Found this answer at http://www.etltools.org/loading/facts.html
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / venkat
If all dimention tables are succeded then only you can load
data in to the facts.if any one of the dimention is not
filled you cannot load data into the fact tables.Fact table
size can be calculated based on the lowest level
granularity of dimention tables.
| Is This Answer Correct ? | 2 Yes | 5 No |
my source is like this id,name sal 10 abc 1000,10 pqr 2000, 10 xyz 3000 ,10 jkl 4000 and my requirement is like this 10 abc,pqr,xyz,jkl 2000 .... i have try for this by using expression transformatin its ok of the concatenation of second column but the thing is that on third column if u group by using agg t/r the last value will com i.e 4000 but i asked by a interviewer that i dont want the first or last column i want the middle column i.e 2000 .plz reply for the same
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