Hello,
I'm trying to create a table with columns A, B, C, D such that values in
columns A and B are not unique but if you consider them as a paired tuple,
then for every row, <value in col A, value in col B> is
unique. Furthermore, I'd like to create a index to use for searching
through the database using this unique paired tuple.
Does anyone know how to do this without actually merging columns A and B
together?
Thanks.
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