NetTalk Central

Author Topic: Unique Key  (Read 3501 times)

kevin plummer

  • Hero Member
  • *****
  • Posts: 1195
    • View Profile
    • Production Accounting and Software Payroll
Unique Key
« on: January 05, 2010, 08:32:48 PM »
Hi All,

Is there a problem if a field has a value of blank and that field is the Unique Field for a key?

I have several tables with blank fields which represent no code. In the browse for these tables if  sort on this field, I cannot select any other record in the browse. If I sort on the next field then it is ok.

Cheers,

Kevin

Bruce

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 11250
    • View Profile
Re: Unique Key
« Reply #1 on: January 05, 2010, 09:51:40 PM »
Hi Kevin,

two issues here -

if you have several records with the blank field, then how is the key unique?

and yes - the identifier field for a row will cause problems if it is blank.

cheers
Bruce

kevin plummer

  • Hero Member
  • *****
  • Posts: 1195
    • View Profile
    • Production Accounting and Software Payroll
Re: Unique Key
« Reply #2 on: January 06, 2010, 04:15:13 AM »
several tables with 1 blank field each so unique.

As a workaround, I'm going to just fllter out the blank record which I think works better anyway