Is there any example of candidate "expression"

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Is there any example of candidate "expression"

Postby geotah » Thu Nov 19, 2015 7:45 am

Hi all,
I need some fields to have unique values. I follow the instructions on how to declare a candidate field in a table but i don't know what to fill in the "Expression" of "Candidate keys" tab in data builder.

Any code for example?
Thank you.

PS i have made a view with a field named membcode, filter field=( ?GETmembcode )
and in data builder- table's edit-candidate tab I made a new line with the view and variable as the manual says but in the expression I have no experience nor idea what to fill in.
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