Most Efficient SQL to Calculate Running Streak Occurrences - sql

Question

I am looking for the most efficient manner to determine the longest occurrence of a streak within a given data set; specifically, to determine the longest winning streak of games.
Below is the SQL that I have thus far, and it does seem to perform very fast, and as expected from the limited testing I've done on a dataset with around 100,000 records.
DECLARE #HistoryDateTimeLimit datetime = '3/15/2018';
CTE to create result subset from voting dataset.
WITH Results AS (
SELECT
EntityPlayerId,
(CASE
WHEN VoteTeamA = 1 AND ParticipantAScore > ParticipantBScore THEN 'W'
WHEN VoteTeamA = 0 AND ParticipantBScore > ParticipantAScore THEN 'W'
ELSE 'L'
END) AS WinLoss,
match.ScheduledStartDateTime
FROM
[dbo].[MatchVote] vote
INNER JOIN [dbo].[MatchMetaData] match ON vote.MatchId = match.MatchId
WHERE
IsComplete = 1
AND ScheduledStartDateTime >= #HistoryDateTimeLimit
)
CTE to create subset of data with streak type as WinLoss and total count of votes in the partition using ROW_NUMBER().
WITH Streaks AS (
SELECT
EntityPlayerId,
ScheduledStartDateTime,
WinLoss,
ROW_NUMBER() OVER (PARTITION BY EntityPlayerId ORDER BY ScheduledStartDateTime) -
ROW_NUMBER() OVER (PARTITION BY EntityPlayerId, WinLoss ORDER BY ScheduledStartDateTime) AS Streak
FROM
Results
)
CTE to summarize the partitioned vote streaks by WinLoss and a begin date/time, with the total count in the streak.
WITH StreakCounts AS (
SELECT
EntityPlayerId,
WinLoss,
MIN(ScheduledStartDateTime) StreakStart,
MAX(ScheduledStartDAteTime) StreakEnd,
COUNT(*) as Streak
FROM
Streaks
GROUP BY
EntityPlayerId, WinLoss, Streak
)
CTE to select the MAXIMUM (longest) vote streak for WinLoss of W (win) grouped by players.
WITH LongestWinStreak AS (
SELECT
EntityPlayerId,
MAX(Streak) AS LongestStreak
FROM
StreakCounts
WHERE
WinLoss = 'W'
GROUP BY
EntityPlayerId
)
Selecting the useful data from the LongestWinStreak CTE.
SELECT * FROM LongestWinStreak
This is the 3rd iteration of the code; at first I feel like I was overthinking and using windows with the LAG function to define a reset period that was later used for partitioning.
[UPDATE]: SQLFiddle example at http://sqlfiddle.com/#!18/5b33a/1 -- Sample data for the two tables that are used above are as follows.
The data is meant to show the schema, and can be extrapolated for your own testing/usage;
MatchVote table data.
EntityPlayerId IsExtMatch MatchId VoteTeamA VoteDateTime IsComplete
-------------------- ------------ -------------------- --------- ----------------------- ----------
158 1 152639 0 2018-03-20 23:25:28.910 1
158 1 156058 1 2018-03-13 23:36:57.517 1
MatchMetaData table data.
MatchId IsTeamTournament MatchCompletedDateTime ScheduledStartDateTime MatchIsFinalized TournamentId TournamentTitle TournamentLogoUrl TournamentLogoThumbnailUrl GameName GameShortCode GameLogoUrl ParticipantAScore ParticipantAName ParticipantALogoUrl ParticipantBScore ParticipantBName ParticipantBLogoUrl
--------- ---------------- ----------------------- ----------------------- ---------------- -------------------- ------------------ ----------------------- ---------------------------- --------------------------------- -------------- ----------------------- ------------------ ------------------- --------------------- ----------------- ------------------- --------------------
23354 1 2014-07-30 00:30:00.000 2014-07-30 00:00:00.000 1 543 Sample https://...Small.png https://...Small.png Dota 2 Dota 2 https://...logo.png 3 Natus Vincere.US https://...VI.png 0 Not Today https://...ay.png
44324 1 2014-12-15 12:40:00.000 2014-12-15 11:40:00.000 1 786 Sample https://...Small.png https://...Small.png Counter-Strike: Global Offensive CS:GO https://...logo.png 0 Avalier's stars https://...oto.png 1 Kassad's Legends https://...oto.png