2.What is loop? How resolve the loop?explain it?
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Answer Posted / vidya
Loop is a Multiple paths between the tables selected in
queries. Or you can say loop is a closed path structure.
Loops can be resolved by…
ALIASES
•Alias - Same as the namesake in SQL.
•Exact duplicate of the original table.
.A different name “tricks” the SQL query to accept that you
are using 2 different tables.
CONTEXTS
•Rule which helps BO decide which of the 2 paths to choose
in a loop.
•BO prompts the user to indicate the correct perspective
(relevant path) for the query.
When to Alias
A loop with a single lookup table should be resolved by an
alias
A lookup table can be identified by its cardinality
A lookup table only has the ‘one’ end of joins attached to
it
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Hi I'm using data federator.I would like to know if it allows select statment in where clause.For example: SELECT Employee, company, orgunit FROM TAB_BIG WHERE employee IN (Select TAB_SMALL.employee FROM TAB_SMALL WHERE flag = X ) bye
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