PostgreSQL tsrange - 重叠忽略等效范围?

时间:2017-04-25 22:39:26

标签: ruby-on-rails postgresql overlap range-types

我的Rails应用程序中有一个查询,如下所示:

# Returns any records whose period intersect the specified time
# @see https://www.postgresql.org/docs/9.3/static/rangetypes.html
# @see https://www.postgresql.org/docs/9.3/static/functions-range.html
# @note The '()' means exclude both sides of the range
#
# @param period_start [DateTime,Time] Start of the range
# @param period_end [DateTime,Time] End of the range
scope :overlapping, ->(period_start, period_end) {
  where(
    "#{table_name}.period && tsrange(:period_start, :period_end, '()')",
    period_start: Time.at(period_start.to_i), # Caps precision to the second
    period_end: Time.at(period_end.to_i) # Caps precision to the second
  ).distinct
}

但是,此处的问题是,不会返回任何具有相同期间作为period_startperiod_end创建的范围的记录。这是为什么?如果有任何交叉点,我认为重叠检查了吗?

1 个答案:

答案 0 :(得分:1)

  

但是,这里的问题是,不会返回任何具有相同周期作为period_start和period_end创建的范围的记录。

那不是真的。不确定你的问题是什么,但那不是它。

SELECT
  tsrange(x,y),
  tsrange(x,y) && tsrange(x,y) AS overlaps
FROM ( VALUES
  ('yesterday'::timestamp, 'today'::timestamp)
) AS t(x,y);
                    tsrange                    | overlaps 
-----------------------------------------------+----------
 ["2017-04-24 00:00:00","2017-04-25 00:00:00") | t
(1 row)