SQL-获取多个范围之间的时间总和

时间:2019-02-20 00:05:28

标签: sql sql-server math logic boolean-logic

enter image description here

上面的图片代表了我一直试图在MSSQL中完成的事情。

这是一个具有多个时间范围的时间表,A到B是加班,B到C是早上的常规工作,C到D是午餐时间,D到E是下午的常规工作,E到F,也是加班。 >

为简单起见,我手动将A,B,C,D,E和F声明为固定值。实际上,这些将从另一个表中获取,但与该问题无关。

垂直箭头代表计时输入/输出时间。

所以,假设进站时间是早上8点,出站时间是晚上7点。

如何检索以下内容?

  • 工作:8小时

  • 午餐:1小时

  • 加班:2小时

无需使用混乱的 IF ,并且知道IN可能位于B和C的中间。

有人在早上11点钟上班,在晚上7点钟下班,现在工作= 6h,午餐= 1h,加班时间= 1h。

谢谢。

例如,以我当前的意大利面条代码为例,肯定有一种更优雅(更简洁)的方法来实现此目的。

declare @clockIn time = '08:00'
declare @clockOut time = '19:00'

declare @a time= '00:00'
...all possible limits defined here...
declare @f time= '23:59'

tests using C to D only:

-- in block
IF(@clockIn >= @c
   AND @clockOut <= @d)
    BEGIN
        SET @at = @at + ABS(DATEDIFF(hour, @clockIn, @clockOut));
    END;
-- outside block
IF(@clockIn < @c
   AND @clockOut > @d)
    BEGIN
        SET @at = @at + ABS(DATEDIFF(hour, @c, @d));
    END;
-- cIn in block, cOut outside
IF(@clockIn >= @c
   AND @clockOut > @d)
    BEGIN
        SET @at = @at + ABS(DATEDIFF(hour, @clockIn, @d));
    END;
-- cIn outside, cIn inside
IF(@clockIn < @c
   AND @clockOut <= @d)
    BEGIN
        SET @at = @at + ABS(DATEDIFF(hour, @c, @clockOut));
    END
select @ax as overtime,@at as work,@ai as lunch

1 个答案:

答案 0 :(得分:1)

我想不出不以某种方式构建if-then逻辑就可以做到这一点的方法,所以这取决于您如何做。我认为最简单(也许也是最易读)的方法是在每次需要的时间使用一个case表达式,也许在逻辑后面留下一些评论,以便遇到它的任何人都可以更容易地理解它的工作方式。 / p>

例如,这样的事情应该足够简单,而不会造成太多混乱(IMO):

DECLARE @Clock TABLE (Clockin TIME NOT NULL, Clockout TIME NOT NULL);
INSERT @Clock VALUES ('12:30', '19:00');

DECLARE @Times TABLE (WorkStart TIME NOT NULL, LunchStart TIME NOT NULL, LunchEnd TIME NOT NULL, WorkEnd TIME NOT NULL);
INSERT @Times VALUES ('09:00', '12:00', '13:00', '18:00');

SELECT 
    OverTime = 
        (CASE -- Overtime hours in the morning.
            WHEN C.Clockin < T.WorkStart -- Clocked in before official work start.
            THEN DATEDIFF(MINUTE, C.Clockin, CASE WHEN C.Clockout > T.WorkStart THEN T.WorkStart ELSE C.Clockout END) 
            ELSE 0 
        END + 
        CASE -- Overtime hours in the evening.
            WHEN C.Clockout > T.WorkEnd -- Clocked out after official work end.
            THEN DATEDIFF(MINUTE, CASE WHEN C.Clockin > T.WorkEnd THEN C.Clockin ELSE T.WorkEnd END, C.Clockout) 
            ELSE 0 
        END) / 60.0,
    Work =
        (CASE -- Work hours for the morning.
            WHEN C.Clockout > T.WorkStart AND C.Clockin < T.LunchStart -- Clocked out after official work start and clocked in before official lunch start.
            THEN DATEDIFF(MINUTE, CASE WHEN C.Clockin < T.WorkStart THEN T.WorkStart ELSE C.Clockin END, CASE WHEN C.Clockout < T.LunchStart THEN C.Clockout ELSE T.LunchStart END) 
            ELSE 0
        END + 
        CASE -- Work hours for the afternoon.
            WHEN C.Clockin < T.WorkEnd AND C.Clockout > T.LunchEnd -- Clocked out after official lunch end and clocked in before official work end.
            THEN DATEDIFF(MINUTE,CASE WHEN C.Clockin < T.LunchEnd THEN T.LunchEnd ELSE C.Clockin END, CASE WHEN C.Clockout < T.WorkEnd THEN C.Clockout ELSE T.WorkEnd END) 
            ELSE 0
        END) / 60.0,
    Lunch =
        CASE -- Lunch hours.
            WHEN C.Clockin < T.LunchEnd AND C.Clockout > T.LunchStart -- Clocked in before official lunch end and clocked out after official lunch start.
            THEN DATEDIFF(MINUTE, CASE WHEN C.Clockin > T.LunchStart THEN C.Clockin ELSE T.LunchStart END, CASE WHEN C.Clockout < T.LunchEnd THEN C.Clockout ELSE T.LunchEnd END) 
            ELSE 0
        END / 60.0
FROM @Clock AS C
CROSS JOIN @Times AS T;