计算每组中特定行的百分比

Question

我正在尝试制作一个 Grafana 时间序列图表，显示 Pi-hole 阻止的查询的百分比。我所做的查询如下，但结果肯定不正确，我认为这是因为我处理 where 子句的方式。

SELECT
  timestamp AS time,
  100.0 * (
    SELECT COUNT(*) AS query_count
    FROM queries
    WHERE status IN (1, 4, 5, 6, 7, 8, 9, 10, 11, 15)
  ) / COUNT(*) AS percentage
FROM
  queries
GROUP BY
  time

Answer 1

如果我理解正确，那么使用条件聚合。对于每个组，以下查询将为您提供具有特定状态的查询的百分比：

SELECT
  timestamp AS time,
  100.0 * COUNT(CASE WHEN status IN (1, 4, 5, ...) THEN 1 END) / COUNT(*) AS percentage
FROM
  queries
GROUP BY
  time

或者：

SELECT
  timestamp AS time,
  AVG(CASE WHEN status IN (1, 4, 5, ...) THEN 100.0 ELSE 0.0 END) AS percentage
FROM
  queries
GROUP BY
  time

Answer 2

我将其添加到 ypur 查询中：

 Select
 timestamp as time,
(  100.0 * 
(
SELECT COUNT( * ) as query_count FROM queries WHERE status IN (1, 4, 5, 6, 7, 8, 9, 10, 11, 15)
) ) / (SELECT COUNT( * ) as query_count FROM queries) as percentage
FROM 
  queries
GROUP BY
  time;

我在开始时添加选择，并在子查询上添加选择以进行计数