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我在Stackoverflow中发现了以下内容,并且一直在使用它来查找每个月的患者天数。如果我同时拥有“承诺”和“排出”日期,那么它工作得非常好。计算入学日期和今天之间的天数
我不知道如何编辑它以计算出院日期尚未完成时的患者日期......患者仍在医院。如果觉得我应该使用Coalesce或ISNULL来查找放电日期为NULL的记录,但我不是程序员,并且会感谢您的帮助。
WITH Mos AS (
SELECT
D.ED_ADMIT_DATE,
D.ED_DISCHARGE_DATE,
Number,
DateAdd(Month, Number, D.ED_ADMIT_DATE - Day(D.ED_ADMIT_DATE) + 1) MoDate
FROM
cases_cstm D
INNER JOIN master.dbo.spt_values V ON V.Number <= DateDiff(Month, D.ED_ADMIT_DATE, D.ED_DISCHARGE_DATE)
WHERE
V.Type = 'P'), Dys AS (
SELECT
MoDate,
DateDiff(
Day,
CASE WHEN Number = 0 THEN ED_ADMIT_DATE ELSE MoDate END,
CASE WHEN Number = DateDiff(Month, ED_ADMIT_DATE, ED_DISCHARGE_DATE) THEN ED_DISCHARGE_DATE ELSE DateAdd(Month, 1, MoDate) -1
END
) + 1 Cnt
FROM Mos)
SELECT Year(MoDate) Yr,
Coalesce(DateName(Month, MoDate), 'Total') Mo,
Convert(varchar(11), Sum(Cnt)) + ' day' + CASE WHEN Sum(Cnt) = 1 THEN '' ELSE 's' END Descr
FROM Dys
GROUP BY MoDate
WITH ROLLUP
ORDER BY
Grouping(MoDate),
MoDate;
谢谢Adnomar,我很感激。 – Stan 2011-12-28 18:13:59