On Monday, July 18, 2016, Pál Teleki <
ellenallhatatlan@gmail.com> wrote:
Now, why can't I use deptot and stot_per_man aliases in my query? It would
greatly simplify the SQL by removing the need for a subquery (or inline view
as Oracle calls them).
SQL execution of a query is only done once. Referring to an alias at the same level in a query would require some kind of duplication to work. Either two phase processing or cloning the subselect that is being alised and executing it a second time to be used in the second location. Neither are desirable.
David J.