需要结合两个SQL查询

Question

I have two code samples that I would like to combine. The first provides the number of people in Jail for a point in time.

SELECT
    COUNT (Distinct b.BookingNumber)
FROM 
    Booking b
INNER JOIN 
    HousingNodePersonHistory hnph ON b.BookingKey = hnph.BookingKey
INNER JOIN 
    View_Housing vh ON hnph.HousingNodeKey = vh.HousingNodeKey
WHERE 
    b.BookingDateTime <= '2018-08-13 06:23:59.999'
    AND hnph.BeginDateTime <= '2018-08-13 06:23:59.999' 
    AND (hnph.EndDateTime >= '2018-08-13 06:23:59.999' OR hnph.EndDateTime IS NULL OR hnph.EndDateTime = '')
    AND (vh.HousingDescription LIKE '%ACJ%')

The second returns a list of datetimes that I would like the first to use to give me the same population return for every day in 2018 so I can provide an updated average daily population for 2018.

DECLARE @StartDate DATETIME = '2018-01-01 00:00:00.000',
        @EndDate   DATETIME = GETDATE();

WITH theDates AS
(
    SELECT 
        @StartDate AS theDate
    UNION ALL
    SELECT 
        DATEADD(DAY, 1, theDate)
    FROM 
        theDates
    WHERE 
        DATEADD(DAY, 1, theDate) <= @EndDate
)   
SELECT 
    theDate
    --,1 as theValue
FROM 
    theDates
OPTION (MAXRECURSION 0)

Is there any way to use the dates provided by the second query to populate and run in the where clause in the first query?

Answer 1

You can use a join :

WITH theDates AS (
      SELECT @StartDate as theDate
      UNION ALL
      SELECT DATEADD(day, 1, theDate)
      FROM theDates
      WHERE DATEADD(day, 1, theDate) <= @EndDate
     ) 
SELECT d.theDate, COUNT(Distinct b.BookingNumber)
FROM (SELECT d.theDate, DATEADD(minute, d.theDate, 6*60 + 24) as ddhhmm
      FROM thedates d
     ) d CROSS JOIN
     Booking b JOIN
     HousingNodePersonHistory hnph
     ON b.BookingKey = hnph.BookingKey JOIN
     View_Housing vh
     ON hnph.HousingNodeKey = vh.HousingNodeKey
WHERE b.BookingDateTime <= d.ddhhmm AND
      hnph.BeginDateTime <= d.ddhhmm AND
      (hnph.EndDateTime >= d.ddhhmm OR hnph.EndDateTime IS NULL OR hnph.EndDateTime = ''
      ) AND
      vh.HousingDescription LIKE '%ACJ%' 
GROUP BY d.theDate
OPTION (MAXRECURSION 0);

Answer 2

I would do it by adding a day range to your calendar table and filtering by day. You then simply add the StartDate in the select list and aggregate it in the GROUP BY .

DECLARE @StartDate datetime = '2018-01-01 00:00:00.000'
       ,@EndDate   datetime = GETDATE()

     ;WITH theDates AS
     (SELECT @StartDate as startDate, DATEADD(minute,-1,DATEADD(day,1,@StartDate)) as endDate
      UNION ALL
      SELECT DATEADD(day, 1, startDate) as startDate, DATEADD(minute,-1,DATEADD(day,2,startDate))  as endDate
        FROM theDates
       WHERE DATEADD(day, 1, startDate) <= @EndDate
     )

    Select 
        StartDate = theDates.startDate,  
        BookingCount = COUNT (Distinct b.BookingNumber)
    FROM 
        Booking b
        INNER JOIN HousingNodePersonHistory hnph ON b.BookingKey = hnph.BookingKey
        INNER JOIN View_Housing vh ON hnph.HousingNodeKey = vh.HousingNodeKey
        INNER JOIN theDates D ON b.BookingDateTime BETWEEN D.startDate AND d.endDate 
    WHERE 
        vh.HousingDescription LIKE '%ACJ%'
    GROUP BY
       theDates.StartDate
OPTION (MAXRECURSION 0)