ruby - Ruby Sequeĺ 中的空间 where 子句

Question

如何在 Ruby Sequel 中编写此 SQL 查询:

SELECT
  polygon.geometry, count(line)
FROM
  polygon, line
WHERE
  st_intersects(line.geometry, polygon.geometry)
GROUP BY
  polygon.geometry

Answer 1

可能有更好的方法，但这是我尝试的解决方案:

DB.from(:polygon, :line)
  .where('st_intersects(line.geometry, polygon.geometry')
  .select('polygon.geometry, count(line)')
  .group_by(:polygon__geometry)

生成的 SQL 查询(我用 Oracle 数据库做了这个，但结果应该是一样的):

#<Sequel::Oracle::Dataset: "SELECT 'polygon.geometry, count(line)' FROM \"POLYGON\", \"LINE\" WHERE (st_intersects(line.geometry, polygon.geometry) GROUP BY \"POLYGON\".\"GEOMETRY\"">