sql-server – 将每日时间表分组为[开始日期;结束日期]与工作日

这是一个简单的策略,可用于短于或长于一周的序列(替换任何其他数字的常数7的任何出现,以及从DayNo的MODULUS x而不是DATEPART(wk)计算的dowBit),直到32.

SET DATEFIRST 1 -- Make Monday weekday=1

-- Get the minimum information needed to calculate sequences
DECLARE @Days TABLE (ContractID int NOT NULL,DayNo int NOT NULL,dowBit int NOT NULL,PRIMARY KEY (ContractID,DayNo));
INSERT INTO @Days
SELECT ContractID,CAST(CAST(dt AS datetime) AS int) AS DayNo,dt)-1) AS dowBit
FROM @Src

DECLARE @RangeStartFirstPass TABLE (ContractID int NOT NULL,DayNo))

-- Calculate,from the above list,which days are not present in the previous 7
INSERT INTO @RangeStartFirstPass
SELECT r.ContractID,r.DayNo
FROM @Days r
LEFT JOIN @Days pr ON (pr.ContractID = r.ContractID AND pr.DayNo BETWEEN r.DayNo-7 AND r.DayNo-1) -- Last 7 days
GROUP BY r.ContractID,r.DayNo,r.dowBit
HAVING r.dowBit & COALESCE(SUM(pr.dowBit),0) = 0

-- Update the previous list with all days that occur right after a missing day
INSERT INTO @RangeStartFirstPass
SELECT *
FROM (
    SELECT DISTINCT ContractID,(SELECT MIN(DayNo) FROM @Days WHERE ContractID = d.ContractID AND DayNo > d.DayNo + 7) AS DayNo
    FROM @Days d
    WHERE NOT EXISTS (SELECT 1 FROM @Days WHERE ContractID = d.ContractID AND DayNo = d.DayNo + 7)
    ) d
WHERE DayNo IS NOT NULL AND
      NOT EXISTS (SELECT 1 FROM @RangeStartFirstPass WHERE ContractID = d.ContractID AND DayNo = d.DayNo)

DECLARE @RangeStart TABLE (ContractID int NOT NULL,DayNo));

-- Fetch the first sequence for each contract
INSERT INTO @RangeStart
SELECT ContractID,MIN(DayNo)
FROM @RangeStartFirstPass
GROUP BY ContractID

-- Add to the list above the next sequence for each contract,until all are added
-- (ensure no sequence is added with less than 7 days)
WHILE @@ROWCOUNT > 0
  INSERT INTO @RangeStart
  SELECT f.ContractID,MIN(f.DayNo)
  FROM (SELECT ContractID,MAX(DayNo) AS DayNo FROM @RangeStart GROUP BY ContractID) s
  JOIN @RangeStartFirstPass f ON (f.ContractID = s.ContractID AND f.DayNo > s.DayNo + 7)
  GROUP BY f.ContractID

-- Summarise results
SELECT ContractID,CASE WHEN WeekDays & 64 > 0 THEN 'Sun,' ELSE '' END +
       CASE WHEN WeekDays & 1 > 0 THEN 'Mon,' ELSE '' END +
       CASE WHEN WeekDays & 2 > 0 THEN 'Tue,' ELSE '' END +
       CASE WHEN WeekDays & 4 > 0 THEN 'Wed,' ELSE '' END +
       CASE WHEN WeekDays & 8 > 0 THEN 'Thu,' ELSE '' END +
       CASE WHEN WeekDays & 16 > 0 THEN 'Fri,' ELSE '' END +
       CASE WHEN WeekDays & 32 > 0 THEN 'Sat,' ELSE '' END AS WeekDays
FROM (
    SELECT r.ContractID,MIN(d.dt) AS StartDT,MAX(d.dt) AS EndDT,COUNT(*) AS DayCount,SUM(DISTINCT d.dowBit) AS WeekDays
    FROM (SELECT *,COALESCE((SELECT MIN(DayNo) FROM @RangeStart WHERE ContractID = rs.ContractID AND DayNo > rs.DayNo),999999) AS DayEnd FROM @RangeStart rs) r
    JOIN @Days d ON (d.ContractID = r.ContractID AND d.DayNo BETWEEN r.DayNo AND r.DayEnd-1)
    GROUP BY r.ContractID,r.DayNo
    ) d
ORDER BY ContractID,StartDT

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