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nested function() in select statement

scottjhnFeb 22 2014 — edited Feb 22 2014

Oracle 11g. Try to nest a function in the select statement. Purpose: get the average customer rating for each of the user qualified.

select user_name, f_get_avg_cust_rating() 'Rating'

from TAB_USER u, OTHER_TABLES o

where u.id = o.id and other condition matched;

How would Oracle process the sql. Is it

1) First screen records based on the where clause, then call the f_get_avg_cust_rating() for each of the selected records OR

2) While scanning the tables, the f_get_avg_cust_rating() will be called for each record encountered?

Thanks

Scott

This post has been answered by AnnEdmund on Feb 22 2014

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