提高Postgres的性能

Question

我以这种方式计算用户数量，它运行了5秒钟才产生结果，我正在寻找更好的解决方案

SELECT COUNT(*)
FROM (SELECT user_id
      FROM slot_result_primary
      WHERE session_timestamp BETWEEN 1590598800000 AND 1590685199999
      GROUP BY user_id) AS foo

Answer 1

Answer 2