Question

我的查询类似于以下内容：

  SELECT id, max(subq.foo), sum(subq.bar), etc...
  FROM (
      SELECT id,
           first_value(foo) over w as foo,
           etc...
      FROM my_table
      WHERE <where information>
      WINDOW w AS (PARTITION BY id 
                   ORDER BY time_stamp ASC
                   RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
  ) as subq

如何使用sqlalchemy完成此操作？特别是，我的问题是关于在内部查询上完成该窗口。

谢谢！

Answer 1

结束这样做：

# hack to get window supported
subq = subq.filter(text("TRUE WINDOW w AS (PARTITION BY id "
                        "ORDER BY time_stamp ASC "
                        "RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)"))

这将是应用于查询的最后一个过滤器，因此最终会得到这样的sql：

WHERE .... AND TRUE WINDOW w as (PARTITION BY id ORDER BY ...)

使用SQLAlchemy，PGSQL远程窗口子查询怎么做？

1 个答案: