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Re: Unique constraint and NULL values

From: Mark C. Stock <mcstockX_at_Xenquery>
Date: Fri, 22 Oct 2004 15:54:39 -0400
Message-ID: <VsCdnRYekZkC-OTcRVn-ow@comcast.com> 






"Dave" <slimdave_at_yahoo.com> wrote in message
news:c502cdfc.0410221123.4e07df91_at_posting.google.com...


| If you want to get around this, then use a function-based index to

| avoid including in a unique index any rows where either of the columns

| is null.


|




| One method would be ...

| [code]

| Create unique index my_ind

| on my_tab (Decode(col2,Null,Null,col1),Decode(col1,Null,Null,col2))

| [/code]




ahh! that appears to nicely trump my pre-FBI solution of using triggers and
a shadow table



++ mcs
Received on Fri Oct 22 2004 - 14:54:39 CDT












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