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Re: Re[JN]: to_number question

jaromir nemec

2004-07-15

Replies:
----- Original Message -----
From: "Wolfgang Breitling" <breitliw@(protected)>
To: <oracle-l@(protected)>
Sent: Thursday, July 15, 2004 8:27 PM
Subject: Re: Re[2]: to_number question


Quoting Jonathan Gennick <jonathan@(protected)>:

> Astounding. It's also astounding I've never run into this
> issue before. It's not like I never write subqueries.
>


Hi all,

Small amendment, it is definitive not only topic of subqueries. Similar
"result" is possible to achieve playing with predicate order.

I use in my example ordered_predicate hint to demonstrate it, but I assume
that it is general accepted that the optimizer is free to reorder the
predicates resulting sometime in error sometimes in right answer.

In this case I see no "bug theory" explanation.



Regard



Jaromir D.B. Nemec

http://www.db-nemec.com



SQL> select * from x;



A       B

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

a       10

a       20

a       30

a       40

b       11

b       21

b       31

b       41b



8 rows selected.



SQL> select /*+ ordered_predicates */ a, to_number(b) from x where
to_number(b)

=10 and to_char(a) < 'b';

ERROR:

ORA-01722: invalid number







no rows selected



SQL> select /*+ ordered_predicates */ a, to_number(b) from x where
to_char(a) <

'b' and to_number(b) =10;



A       TO_NUMBER(B)

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

a             10



SQL> EXPLAIN PLAN set statement_id = 'N1' into nemecj.plan_table FOR

2 select /*+ ordered_predicates */ a, to_number(b) from x where
to_number(b)

=10 and to_char(a) < 'b';



Explained.



SQL> SELECT * FROM
table(DBMS_XPLAN.DISPLAY('nemecj.plan_table','N1','ALL'));



PLAN_TABLE_OUTPUT

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





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

| Id | Operation        | Name     | Rows | Bytes | Cost (%CPU)|

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

|  0 | SELECT STATEMENT   |         |   1 |   4 |   5 (20)|

|* 1 | TABLE ACCESS FULL  | X       |   1 |   4 |   5 (20)|

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



Predicate Information (identified by operation id):

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





PLAN_TABLE_OUTPUT

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



 1 - filter(TO_NUMBER("X"."B")=10 AND "X"."A"<'b')



12 rows selected.



SQL> EXPLAIN PLAN set statement_id = 'N2' into nemecj.plan_table FOR

2 select /*+ ordered_predicates */ a, to_number(b) from x where
to_char(a) <

'b' and to_number(b) =10;



Explained.



SQL> SELECT * FROM
table(DBMS_XPLAN.DISPLAY('nemecj.plan_table','N2','ALL'));



PLAN_TABLE_OUTPUT

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





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

| Id | Operation        | Name     | Rows | Bytes | Cost (%CPU)|

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

|  0 | SELECT STATEMENT   |         |   1 |   4 |   5 (20)|

|* 1 | TABLE ACCESS FULL  | X       |   1 |   4 |   5 (20)|

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



Predicate Information (identified by operation id):

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





PLAN_TABLE_OUTPUT

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



 1 - filter("X"."A"<'b' AND TO_NUMBER("X"."B")=10)



12 rows selected.



SQL> quit;

Disconnected from Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.1.0 - Production




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