創建未來呼叫Rercords SQL

Question

我有一個包含客戶，錨定日期（原始銷售日期），呼叫頻率（7,14或21天）的表。我需要使用客戶特定的錨定日期和頻率來創建未來通話記錄並將其添加到表格中，直到定義的結束日期。我使用SQL 2008

Answer 1

這看起來像一個開始：

declare @Customers as Table (CustomerId Int Identity, AnchorDate Date, CallFrequency Int); 
insert into @Customers (AnchorDate, CallFrequency) values 
    ('20130101', 7), ('20130102', 14), ('20130103', 21), 
    ('20130104', 7), ('20130105', 14), ('20130106', 21), 
    ('20130107', 7), ('20130108', 14), ('20130109', 21); 
select * 
    from @Customers 

declare @EndDate as Date = '20131231'; 
declare @Today as Date = SysDateTime(); 

with FutureCalls as (
    select CustomerId, DateAdd(day, (DateDiff(day, AnchorDate, @Today)/CallFrequency + 1) * CallFrequency, AnchorDate) as CallDate, CallFrequency 
    from @Customers 
    union all 
    select CustomerId, DateAdd(day, CallFrequency, CallDate), CallFrequency 
    from FutureCalls 
    where DateAdd(day, CallFrequency, CallDate) <= @EndDate 
) 
    select * 
    from FutureCalls 
    order by CallDate, CustomerId 
    option (MaxRecursion 0)