On Mon, Sep 26, 2011 at 12:06 PM, firebirdsql <firebird...@yahoo.com> wrote:
> I have the following view: > CREATE VIEW as example > AS > SELECT col1 FROM table1 INNER JOIN table2 USING(col1); > > Then when I use it: > SELECT a.col1, a.col2, a.col3 FROM table1 AS a INNER JOIN example > USING (col1); > > > Is the optimizer smart enough to figure out that it can join table1 > directly to table 2 and get col1, col2, col3? Or does it process the view > first and then join it to table1 (redundant) and get col1, col2, col3? > In this case yes, but some views must be instantiated first, so the general case is more complicated. > Is it possible to display a detailed execution plan? > With isql, you can say set plan, or set plan only. Good luck, Ann > > > > ------------------------------------ > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > Visit http://www.firebirdsql.org and click the Resources item > on the main (top) menu. Try Knowledgebase and FAQ links ! > > Also search the knowledgebases at http://www.ibphoenix.com > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Yahoo! Groups Links > > > > [Non-text portions of this message have been removed]
