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我正在尝试编写一个 sql 查询来计算 Postgresql 中的 RSI（相对强度指数）并在 grafana 中实现。

我在表中只有 3 列 -

time_stamp bigint, 
metric_name text,
value.max int

RSI 是关于 value.max 用于在 grafana 中作为时间序列查询进行绘图

RSI 参考：https ://school.stockcharts.com/doku.php?id=technical_indicators:relative_strength_index_rsi

我使用的 RSI 查询如下：

SELECT
  $__unixEpochGroup(timestamp/1000, '1m') AS "time",
  value.max - lag(value.max) OVER (ORDER BY $__unixEpochGroup(timestamp/1000, '1m')) AS "diff",
  case when diff > 0 then diff else 0 end as "Gain",
  case when diff < 0 then diff else 0 end as "Loss",
  avg(Gain) OVER (ORDER BY $__unixEpochGroup(timestamp/1000, '1m') ROWS 20 PRECEDING) as "avg_gain",
  avg(Loss) OVER (ORDER BY $__unixEpochGroup(timestamp/1000, '1m') ROWS 20 PRECEDING) AS "avg_loss"
FROM spectrum_schema.my_table
WHERE
  $__unixEpochFilter(time) and
  metric_name = 'CPUUtilization' 
ORDER BY 1

这给出了错误**

窗口函数调用不能嵌套

任何人都可以帮助构建 RSI sql 查询吗？

时间序列数据绘图的正常查询工作如下：

SELECT
  $__unixEpochGroup(timestamp/1000, '1m') AS "time",
  value.max AS "value.max"
FROM spectrum_schema.my_table
WHERE
  $__unixEpochFilter(time) and
  metric_name = 'NetworkThroughput' and 
ORDER BY 1

上面的工作查询也可以调整吗？

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