Latest Number of Consecutive Weeks

Question

I recently posted a similar question about getting the latest number of consecutive days.
I thought with that information I'd be able to do the same for consecutive weeks, but I was wrong...
I tried some queries using a calendar table, but no luck with getting the right results.
Hate to ask again, but I've been stuck on it for the last 4 hours, can't seem to figure it out.
I have a habit tracking app.
I need the latest number of consecutive entries, by week.
Here is some sample data:
DECLARE @entries TABLE (ID INT IDENTITY, habitID INT, date DATETIME)
INSERT INTO @entries (habitID, date) VALUES
(1, '20150218'),(1, '20150225')
DECLARE @habits TABLE (habitID INT, habitStartDate DATE, habitEndDate DATE)
INSERT INTO @habits (habitID, habitStartDate, habitEndDate) VALUES
(1, '2015-02-16',NULL)
There is 1 habit, with 2 entries.
The resulting query should return: 2
This is because the last 2 weeks have had entries, and since this week is still current, we have until the end of the week to make an entry.
But let's say this week goes by, and there have been no entries.
Then next week, the result from the same query should return: -1

Answer 1

Here's what I did:
alter table calendar add HabitWeekStart DATETIME
alter table calendar add HabitPrevWeekStart DATETIME
alter table calendar add HabitWeekEnd DATETIME
alter table calendar add HabitPrevWeekEnd DATETIME
alter table calendar add HabitWeekEndTS DATETIME
alter table calendar add HabitPrevWeekEndTS DATETIME
update calendar
SET
HabitWeekStart = DATEADD(HOUR,27,WeekStart ),
HabitPrevWeekStart = DATEADD(HOUR,27,PrevWeekStart),
HabitWeekEnd = DATEADD(HOUR,27,WeekEnd ),
HabitPrevWeekEnd = DATEADD(HOUR,27,PrevWeekEnd ),
HabitWeekEndTS = DATEADD(HOUR,27,WeekEndTS ),
HabitPrevWeekEndTS = DATEADD(HOUR,27,PrevWeekEndTS)
DECLARE @entries TABLE (ID INT IDENTITY, habitID INT, date DATETIME)
INSERT INTO @entries (habitID, date) VALUES
(1, '20150218'),(1, '20150225'), (2, '20150218')
DECLARE @habits TABLE (habitID INT, habitStartDate DATE, habitEndDate DATE, target INT)
INSERT INTO @habits (habitID, habitStartDate, habitEndDate, target) VALUES
(1, '2015-02-16',NULL,1 ),(2, '2015-02-16',NULL, 1)
IF EXISTS (SELECT 'x' FROM tempdb.sys.tables WHERE name LIKE '#seq%') DROP TABLE #seq
CREATE TABLE #seq (habitID INT, ID INT, today DATE, seq INT, target INT, hits INT, habitStartDate DATE, habitEndDate DATE)
CREATE CLUSTERED INDEX IDXc_HabitID ON #seq (habitID)
INSERT INTO #seq (habitID, ID, today, seq, target, hits, habitStartDate, habitEndDate)
SELECT a.habitID, CASE WHEN COUNT(e.id) >= a.target THEN MAX(e.ID) ELSE NULL END AS ID, a.today, ROW_NUMBER() OVER (PARTITION BY a.habitID ORDER BY a.today) AS seq, a.target, COUNT(e.id) AS hits, habitStartDate, habitEndDate
FROM (
SELECT e.habitID, c.today, e.target, habitStartDate, habitEndDate
FROM @habits e
INNER JOIN calendar c
ON c.today BETWEEN e.habitStartDate AND COALESCE(e.habitEndDate,CURRENT_TIMESTAMP)
GROUP BY habitID, today, e.target, habitStartDate, habitEndDate
) a
LEFT OUTER JOIN @entries e
ON a.habitID = e.habitID
AND DATEADD(SECOND,-10801,e.date) BETWEEN a.today AND DATEADD(SECOND,86459,a.today)
GROUP BY a.habitID, a.today, a.target, habitStartDate, habitEndDate
IF EXISTS (SELECT 'x' FROM tempdb.sys.tables WHERE name LIKE '#base%') DROP TABLE #base
CREATE TABLE #base (habitID INT, habitStartDate DATE, habitEndDate DATE, habitWeekStart DATE, entries INT, seq INT)
CREATE CLUSTERED INDEX IDXc_habitID ON #base (habitID)
CREATE NONCLUSTERED INDEX IDX_habitID_Seq ON #base (habitID, seq) INCLUDE (habitStartDate, habitEndDate, habitWeekStart, entries)
INSERT INTO #base (habitID, habitStartDate, habitEndDate, habitWeekStart, entries, seq)
SELECT h.habitID, h.habitStartDate, h.habitEndDate, c.habitWeekStart, COUNT(e.ID) AS entries, ROW_NUMBER() OVER (PARTITION BY h.habitID ORDER BY c.habitWeekStart) AS seq
FROM @habits h
INNER JOIN calendar c
ON c.today BETWEEN h.habitStartDate AND COALESCE(h.habitEndDate,CURRENT_TIMESTAMP)
LEFT OUTER JOIN @entries e
ON c.today = e.date
AND h.habitID = e.habitID
GROUP BY h.habitID, h.habitStartDate, h.habitEndDate, c.habitWeekStart
;WITH rCTE AS (
SELECT habitID, habitStartDate, habitEndDate, seq, habitWeekStart, entries, CASE WHEN entries > 0 THEN 1 ELSE 0 END as streak
FROM #base
WHERE seq = 1
UNION ALL
SELECT r.habitID, r.habitStartDate, r.habitEndDate, b.seq, b.habitWeekStart, b.entries, CASE WHEN b.entries > 0 THEN r.streak+1
WHEN b.entries = 0 AND r.entries = 0 THEN r.streak-1
ELSE -1 END as streak
FROM rCTE r
INNER JOIN #base b
ON r.habitID = b.habitID
AND r.seq + 1 = b.seq
), rCTEw AS (
SELECT id, habitID, today, seq, CAST(CASE WHEN id IS NULL THEN 0 ELSE 1 END AS INT) AS streak, hits, target, habitStartDate, habitEndDate
FROM #seq
WHERE seq = 1
UNION ALL
SELECT e.id, e.habitID, e.today, e.seq, CAST(CASE WHEN r.ID IS NOT NULL AND e.ID IS NOT NULL THEN r.streak+1
WHEN e.ID IS NULL AND r.ID IS NULL THEN r.streak-1
WHEN e.ID IS NOT NULL AND r.ID IS NULL THEN 1
ELSE 0
END AS INT) AS streak, e.hits, e.target, r.habitStartDate, r.habitEndDate
FROM rCTEw r
INNER JOIN #seq e
ON r.habitID = e.habitID
AND r.seq+1 = e.seq
SELECT habitID, habitStartDate, habitEndDate, today, entries, streak, 'weekly' AS period
FROM rCTE r
INNER JOIN calendar c
ON r.habitWeekStart = c.today
AND c.weekEndTS > DATEADD(DAY,-7,CURRENT_TIMESTAMP)
AND c.weekEndTS < CURRENT_TIMESTAMP
UNION ALL
SELECT habitID, habitStartDate, habitEndDate, today, hits, streak, 'daily'
FROM rCTEw
WHERE today = CAST(DATEADD(DAY,-1,'2015-03-02') AS DATE)
ORDER BY period, habitID, today
and here's the result:
habitID habitStartDate habitEndDate today entries streak period
1 2015-02-16 NULL 2015-03-01 00:00:00.000 0 -4 daily
2 2015-02-16 NULL 2015-03-01 00:00:00.000 0 -11 daily
1 2015-02-16 NULL 2015-02-23 00:00:00.000 1 2 weekly
2 2015-02-16 NULL 2015-02-23 00:00:00.000 0 -1 weekly