Andrew Dunstan wrote:

Or we could divide the positive number space in two, by starting at 2^14 (attnums are int2). Then a simple bitmask test would work to distinguish them.

Perhaps divide-by-four, then it would be possible to have calculated columns (as mentioned recently on one of the lists). In particular, that would let you have FK constraints with a constant as part of the key.

  Richard Huxton
  Archonet Ltd

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