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我有两张桌子:
regions <id> points <region_id, x, y>
假设每个区域正好有 4 个点,并且这些点描述了一个矩形 - 是否有一个 SQL 查询会给我带来这个视图:
rectangular_regions <region_id, x1, y1, x2, y2>
?
SELECT region_id, MIN(x) AS x1, MIN(y) AS y1, MAX(x) AS x2, MAX(y) AS y2 FROM points GROUP BY region_id.