why we are using derived tables ?how it will help?
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Answer / mayur
hi,
see i would like to answer it through on example:
consider the case where u retrive the data from the table xyz
by writing the "SELECT STATEMENT" & get the output ( say 5 rows) now their is the condition ....where u need this output(5 rows) for report/query..etc..
now, in such condition you can create an object of the above statement i.e "Select Statement" and store it in Derived table
& hence next time u will not require to write sql again...
& even a complex sql is effectively implemented...
finally this will enhance ur performance & a effective development logics ....
| Is This Answer Correct ? | 0 Yes | 4 No |
Instead of Aggregated table we use the Derived table.
Aggregated table will be created by ETL people, for
summarized columns we use Aggregated table.
| Is This Answer Correct ? | 0 Yes | 9 No |
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