Grafana：SQL 查询 - 将 "filter" 应用于 "count"

Question

我正尝试在我的 SQL 查询中对“计数”应用过滤器，但无法找到正确的方法。

左边的查询table显示了错误类型可能具有的不同错误级别。在我的例子中是“0 到 3”，其中 0 表示信息，3 表示 critical_error.

SELECT
  stringsplit(alerts.Source, " - ", 1) AS ERROR_Level,
  stringsplit(alerts.Source, " - ", 2) AS ERROR_Type
FROM alerts

右边的查询table显示总错误数。（出于演示目的，我在实数中添加了一些随机数。）
第一列显示错误类型，第二列显示错误总数。
从第 3 列开始，我只想过滤定义为级别 3 的错误。
下一列错误级别 2 依此类推...

SELECT
  stringsplit(alerts.Source, " - ", 2) AS ERROR_Type,
  COUNT(alerts.Source)+100 AS ERROR_Count,
  COUNT(alerts.Source)+73 AS ERROR_Critical,
#  COUNT(alerts.Source) FILTER(WHERE stringsplit(alerts.Source, " - ", 1) = 3) AS critical,
  COUNT(alerts.Source)+30 AS ERROR_Warning
#  COUNT(alerts.Source) FILTER(WHERE stringsplit(alerts.Source, " - ", 1) = 2) AS warning
FROM alerts
GROUP BY ERROR_Type

正如您在上面的代码中看到的...
stringsplit(alerts.Source, " - ", 1) 打印出错误级别
stringsplit(alerts.Source, " - ", 2) 打印出错误类型

Answer 1

我用 SUM 解决了它。

SELECT
  stringsplit(alerts.Source, " - ", 2) AS error_type,
  COUNT(alerts.Source) AS total,
  SUM(IF(stringsplit(alerts.Source, " - ", 1) = 3,1,0)) AS critical_errors,
  SUM(IF(stringsplit(alerts.Source, " - ", 1) = 2,1,0)) AS errors,
  SUM(IF(stringsplit(alerts.Source, " - ", 1) = 1,1,0)) AS warnings,
  SUM(IF(stringsplit(alerts.Source, " - ", 1) = 0,1,0)) AS informations
FROM alerts
GROUP BY ERROR_Type

Grafana：SQL 查询 - 将 "filter" 应用于 "count"

Grafana: SQL query - Apply "filter" to "count"

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