Sql 按照指定天数时间段查询

BEGIN TRY
    
    DECLARE @BeginTime DATETIME='2017-02-01' 
    DECLARE @EndTime DATETIME='2017-03-3 23:59:59'  
    DECLARE @ShowType INT=0 --展示的类型 0=日 1=十日 2=月
    DECLARE @CusCount INT --成交客户数
    DECLARE @TotlDate INT=10 --统计分组天数


    SELECT @CusCount=COUNT(1) FROM
    (
    SELECT o.Memberid FROM dbo.[Order] o 
    WHERE  o.PayedDateTime BETWEEN @BeginTime AND @EndTime 
    GROUP BY o.Memberid
    ) CusCount

    IF(@ShowType=0)
    BEGIN
        ----日
        SELECT CONVERT(VARCHAR(10),A.PayedDateTime,23) AS ShowDay,COUNT(1) AS 成交笔数,SUM(A.Payed) AS 成交金额,@CusCount AS 成交客户数  FROM 
        (
        SELECT o.Payed,o.PayedDateTime FROM dbo.[Order] o 
        WHERE  o.PayedDateTime BETWEEN @BeginTime AND @EndTime
        ) AS A 
        GROUP BY CONVERT(VARCHAR(10),A.PayedDateTime,23) ;

    END
    ELSE IF(@ShowType=1)
    BEGIN

        ----十日
        SELECT A.FistDate AS ShowDay,COUNT(1) AS 成交笔数,SUM(A.Payed) AS 成交金额,@CusCount AS 成交客户数 FROM
        (
        SELECT o.Payed,t.evdate,CONVERT(int, evdate-@BeginTime)/@TotlDate Gid,@BeginTime+CONVERT(int, evdate-@BeginTime)/@TotlDate*@TotlDate FistDate from 
        (select @BeginTime+number evdate from master..spt_values where type='P' and @BeginTime+number<=@EndTime) t
        LEFT JOIN dbo.[Order] o ON CONVERT(varchar(100), o.PayedDateTime, 112)=CONVERT(varchar(100), t.evdate, 112) 
        WHERE o.Tradestatus='TRADE_FINISHED' AND o.Paystatus=1 AND o.PayedDateTime IS NOT NULL AND o.IsTeamBuyRede !='rede' AND o.StoreId=0 AND o.PayedDateTime BETWEEN @BeginTime AND @EndTime
        ) AS A
        GROUP BY A.Gid,A.FistDate;

    END
    ELSE IF(@ShowType=1)
    BEGIN
        ----月
        SELECT SUBSTRING(CONVERT(VARCHAR(10),A.PayedDateTime,23),1,7) AS ShowDay,COUNT(1) AS 成交笔数,SUM(A.Payed) AS 成交金额,@CusCount AS 成交客户数 FROM 
        (
        SELECT o.Payed,o.PayedDateTime FROM dbo.[Order] o 
        WHERE  o.PayedDateTime BETWEEN @BeginTime AND @EndTime
        ) AS A 
        GROUP BY SUBSTRING(CONVERT(VARCHAR(10),A.PayedDateTime,23),1,7)
    END
    ELSE
    BEGIN
        SELECT ''
    END
END TRY
BEGIN CATCH 

END CATCH

最主要是这里 

(select @BeginTime+number evdate from master..spt_values where type='P' and @BeginTime+number<=@EndTime)