Re: Create view using CAST to change datatype

From: Juan Cachito Reyes Pacheco <jreyes_at_dazasoftware.com>
Date: Fri, 19 Mar 2004 11:08:19 -0400
Message-ID: <002901c40dc4$0c5a92b0$2501a8c0@dazasoftware.com>

Aditionally i verified definetively in 9i, '' is the same that null, WHEN INSERTING TO THE TABLE, NOT
when doing a query.
SQL> create table test1 ( label varchar2(1), thenull varchar(1));

Tabla creada.

SQL> insert into test values('a','');
insert into test values('a','')

*
ERROR en lÝnea 1:
ORA-00942: la tabla o vista no existe

SQL> insert into test1 values('a','');

1 fila creada.

SQL> insert into test1 values('b',null);

1 fila creada.
SQL> select * from test1 where thenull is null; <-- using null you get both

L T
- -
a
b

SQL> select * from test1 where thenull =''; <--- using '' you get nothing

ninguna fila seleccionada

SQL>

Original Message ----- From: "Saira Somani-Mendelin" <saira_somani_at_yahoo.com> To: <oracle-l_at_freelists.org> Sent: Friday, March 19, 2004 11:03 AM Subject: RE: Create view using CAST to change datatype

> Tom,
>
> That's a great suggestion, but how could I do that in a view? Perhaps
> like this? CAST(RTRIM(OB_OID) AS NUMBER) OB_OID... would that work?
>
> Here is the view definition:
>
> CREATE OR REPLACE VIEW V_ITH_F
> AS
> (SELECT
> ITH_RID,
> TRANSACT,
> SKU,
> PKG,
> FROM_LOC,
> TO_LOC,
> TRANSACT_STT,
> WAVE,
> CAST(OB_OID AS NUMBER) OB_OID,
> OB_TYPE,
> CAST(IB_OID AS NUMBER) IB_OID,
> IB_TYPE,
> OB_LNO,
> IB_LNO,
> ACT_QTY,
> WHSE,
> FROM
> ITH_F);
>
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mercadante, Thomas F
> Sent: March 19, 2004 9:54 AM
> To: 'oracle-l_at_freelists.org'
> Subject: RE: Create view using CAST to change datatype
>
> Saira,
>
> My first idea would be to trim the blanks from the column thus
> converting
> the value to a null before casting. Would that work? What happens with
> the
> Cast statement when a null value is involved? Can you show the Create
> View
> Sql?
>
> thanks
>
> Tom Mercadante
> Oracle Certified Professional
>
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Received on Fri Mar 19 2004 - 11:10:14 CST