Re: A trigger vs. "default value" in a table

Hello Andrey

The correct answer depends on what you want ! if you can live with null values in the column then a default for the column is OK, but if you want to handle a insert with a null then you need a trigger. Se the little example :

SQL> create table t (a number, b number default 10);

Table created.

SQL> insert into t (a) values (10);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from t;

A B
---------- ----------
10 10

SQL> insert into t (a,b) values (10, null);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from t;

A B
---------- ----------
10 10
10

Yechiel Adar wrote:

>Hello Andrey
>
>KISS - Why write code to do what oracle does for you?
>
>Yechiel Adar
>Mehish
>----- Original Message -----
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Sent: Monday, May 13, 2002 6:23 PM
>
>
>>Dear list !
>>I need a very simple thing : each time a certain field is null during an
>>insert, to substitiute a string "AAA" instead.
>>What is better : to write a trigger to do so or to define a default value
>>for that column in the table ?
>>Thanks !
>>
>>
>>DBAndrey
>>
>>* 03-9254520
>>* 058-548133
>>* mailto:andreyb_at_elrontelesoft.com
>>
>>
>>
>>
>>--
>>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>>--
>>Author: Andrey Bronfin
>> INET: andreyb_at_elrontelesoft.com
>>
>>Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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-- 

/regards

Peter Gram

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Fax   : +45 4466 8856

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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Peter Gram
  INET: peter.gram_at_miracleas.dk

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