Re: check the duplicate code

If you can change value of del field to:
(Null = deleted, 0(or any not nul value) = not
deleted)
then you can create unique key constraint for code and
department look:
ALTER TABLE QTC_OWNER.department ADD CONSTRAINT A
  UNIQUE (
  code
  ,del
)
/

--- loh wai chin <[email protected]> wrote:
> is there a way to prevent inserting a record that
> with 1 of the fields is 
> dusplicate with the exsiting record.
> 
> i mean lets consider the following situation:
> 
> i have 1 table tbl_department
> 
> description
> 
> id    sys_guid()	(primary key)
> code  nvarchar2(10)     
> del   number(1)		
> 
> * the field tbl_department.del is to indicate
> whether the record is 
> already deleted or not. (1 = deleted, 0 = not
> deleted)
> * tbl_department.code is not a unique key
> 
> 
> let's said there is already a department record
> exist:
> id 		code	del
> == 		====	===
> 999....		abc	0
> 
> 
> im facing a problem that the system is able to
> accept another record with 
> the same tbl_department.code = abc which i try to
> prevent it.
> 
> 
> is there a way (for example, create a trigger) that
> i can check the 
> duplicate code before inserting into the table?
> 
> 
> Thanks a lot and regards,
> ychin
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