Avoid Duplicate Data

[JP-AN]

Hi everyone... 
I need to know how to avoid duplicated data.
I have a table wich columns goes like this:

Name / TEXT
ID / Number
Etc, etc...

So the thing is simple... i dont want the user to be able to introduce the same ID more than once... so it would be like a secondary key i guess...

[Steve]

Did you try the community's search feature? This question has been answered many times.