Robert James wrote:
Hi. I notice that when I do a WHERE x, Postgres uses an index, and when I do WHERE y, it does so as well, but when I do WHERE x OR y, it doesn't. Why is this so? And how can I shut this off?
maybe its because you have no index on (X OR Y) ? or maybe because the analyzer thinks that X or Y includes enough rows that a sequential scan is more effective ?
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