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Re[JN]: to_number question

Re[JN]: to_number question

2004-07-15       - By jaromir nemec

Reply:     1     2  

-- -- 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 (See ORA-01722.ora-code.com): 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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