试试这个查询：
WITH TAB1 (ID,FROMDATE,TODATE1,TODATE) AS
(SELECT ID,
FROMDATE,
DATEADD(SECOND, 24*60*60 - 1, CAST(CAST(FROMDATE AS DATE) AS DATETIME)) TODATE1,
TODATE
FROM TABLE1
UNION ALL
SELECT
ID,
DATEADD(HOUR, 24, CAST(CAST(TODATE1 AS DATE) AS DATETIME)) FROMDATE,
DATEADD(SECOND, 2*24*60*60-1, CAST(CAST(TODATE1 AS DATE) AS DATETIME)) TODATE1,
TODATE
FROM TAB1 WHERE CAST(TODATE1 AS DATE) < CAST(TODATE AS DATE)
),
TAB2 AS
(SELECT ID,FROMDATE,
CASE WHEN TODATE1 > TODATE THEN TODATE ELSE TODATE1 END AS TODATE
FROM TAB1)
SELECT TAB2.*,
DATEPART(hh, TODATE) - DATEPART(hh, FROMDATE) [DateDiff(HH)] FROM TAB2;
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