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If we restrict unique constraints on partitioned tables so that they must always include the partition key, then our standard approach to unique indexes already works --- each unique key is forced to exist within a single partition, so enforcing the unique restriction in each index individually is enough to have it enforced globally. Therefore we can implement unique indexes on partitions by simply removing a few restrictions (and adding others.) Discussion: https://postgr.es/m/20171222212921.hi6hg6pem2w2t36z@alvherre.pgsql Discussion: https://postgr.es/m/20171229230607.3iib6b62fn3uaf47@alvherre.pgsql Reviewed-by: Simon Riggs, Jesper Pedersen, Peter Eisentraut, Jaime Casanova, Amit Langote |
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