what is the difference between look up and joiner(don't say
joiner sopport only = where as look up support non-equijoin).
Answers were Sorted based on User's Feedback
Answer / kondeti srinivas
with lookup we can do left join only
but with joiner we can do all the joins(normal,master
outer,detail outer,full outer)
for mutiple matching only it will give one return value
based on lookup policy(first value or last value like that)
in lookup transformation. but in the joiner transformation
it will give the output for all the matchings
if any one knows more than this please let me know
Is This Answer Correct ? | 12 Yes | 1 No |
Answer / akash
In addition to Kondeti's points:
1. With look up we have an option to match the data
dynamically if we use dynamic lookup.
2. If the match is not found may or may not send the record
(depending upon the joiner condition) but in case of look
up the output will be returned as default value or NULL for
every record where match is not found.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / v.ramakrishna
both lookup and joiner transfromations are used to
horizantal merging . But lookup transformation can be
treated as paasive transformation where as joiner trans can
be treated as active transfr bcoz no of records input to
joiner will vary with output records. But in Lookup
transformation even though it searches for each record in
lookup if condition satisfied it will come as output even
condition not satisfied also , in that case it returns null
valu so no of records input to lookup is equal with outputs
due to null values this is the major diff between joiner
and lookup according to me.
Is This Answer Correct ? | 1 Yes | 0 No |
How to read data from flat file source if the data is in paragraph format?
explain about unit testing? in real time?
What is an aggregator transformation?
How can we trouble shoot the commas in a column of a comma delimited flat file in Informatica
what r the values tht r passed between informatics server and stored procedure?
I have 2 Sources,If 1st one Read sucessfully,Then only it has to move to read 2nd source.How can i do in INFORMATICA.
When do you use mapping parameters? (In which transformations)
daily how much amount of data send to production?
How mapping parameter and variable works
can we use self join in informaitca?
How to eliminate duplicate records in informatica mapping? Explain with an example....
how to join two flat file if they have diff. structure?how to join one relational and one flat file?