Detect Anomaly Intervals with SQL

Question

My problem is simple: I have a table with a series of statuses and timestamps (for the sake of curiosity, these statuses indicate alarm levels) and I would like to query this ta

Answer 1

Just for the sake of having an alternative. Tried to do some test on performance, but did not finish.

SELECT
  MIN([main].[Start]) AS [Start],
  [main].[End],
  DATEDIFF(s, MIN([main].[Start]), [main].[End]) AS [Seconds]
FROM
(
  SELECT
    [sub].[Start],
    MIN([sub].[End]) AS [End]
  FROM
  (
    SELECT
      [start].[Timestamp] AS [Start],
      [start].[Status] AS [StartingStatus],
      [end].[Timestamp] AS [End],
      [end].[Status] AS [EndingStatus]
    FROM [Alerts] [start],  [Alerts] [end]
    WHERE [start].[Status] = 2 
      AND [start].[Timestamp] < [end].[Timestamp]
      AND [start].[Status] <> [end].[Status]
  ) AS [sub]
  GROUP BY
    [sub].[Start],
    [sub].[StartingStatus]
) AS [main]
GROUP BY
  [main].[End]

And here is a Fiddle.