Hej Rainer, I noticed this, but here it was about defining a column in a table that is not allowed to contain the same value twice. The index seems dedicated for that issue.
Regards, exxos. On Wed, May 18, 2011 at 9:26 PM, Rainer Döbele <[email protected]> wrote: > Hi exxos, > > I don't quite understand your question. > What do you consider a unique column? > > Some databases allow integer columns that are automatically populated from > a sequence (e.g. identity columns in Microsoft SQL). > > Another feature in Microsoft sql is the data type "uniqueidentifier" which > is a guid that will be automatically generated for each row. > > For those two cases Empire-db offers the data types DataType.AUTOINC and > DataType.UNIQUEID. > The exact implementation however is database specific. The Oracle driver > e.g. will create a number column and automatically create a sequence for > AutoInc columns (on DDL generation). > > Does this answer help you? > > Regards > Rainer > > > Exxos wrote: > > from: exxos [mailto:[email protected]] > > to: [email protected] > > re: How to tell that a rows is UNIQUE ? > > > > Hello, > > > > At the colomn declartion in DBTable, how to tell that a colomn is unique > ? > > (I'm not talking about primaries keys) > > > > Regards, > > exxos. >
