function() nested in the select statement

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

Select user_name, f_get_avg_cust_rating() "Notation.

of u, OTHER_TABLES o TAB_USER

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

How Oracle would deal with the sql.  Is it

(1) first of all display records based on the where clause, then call the f_get_avg_cust_rating() for each of the selected records OR

(2) for the analysis in tables, the f_get_avg_cust_rating() will be called for each record met?

Thank you

Scott

Words of Frank, I created two functions with dbms_output and used a function in where clause in select another function. See the bottom of the unit tests. Everyone says, where first clause then select...

-Where function clause

SQL > CREATE or REPLACE FUNCTION ret_empno

2 RETURN NUMBER

3 AS

4 BEGIN

5 DBMS_OUTPUT. Put_line (' where Clause Function');

6 RETURN 7839;

7 END;

8.

The function is created.

-Select the function

SQL > CREATE or REPLACE FUNCTION ret_1

2 RETURN NUMBER

3 AS

4 BEGIN

5 DBMS_OUTPUT. Put_line ('Select function');

6 RETURN 1;

7 END;

8.

The function is created.

SQL > SELECT empno, ename,ret_1

2 FROM emp

3. WHERE empno = ret_empno;

EMPNO, ENAME RET_1

---------- ---------- ----------

7839 KING 1

Where the function Clause

Select the function

Tags: Database

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EMPNO      OTBOOKEDDA DAY1_HRS   DAY2_HRS   DAY3_HRS   DAY4_HRS   DAY5_HRS   DAY6_HRS   DAY7_HRS
---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
101        03-03-2013 09:00      01:00      01:00      01:00      01:00      01:00      00:00
102        03-03-2013 09:00      01:00      01:00      02:00      01:00      04:00      01:00
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SQL>

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    user9196150 wrote:
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