sql-server-2008 - 创建未来通话记录 SQL

Question

我有一个包含客户、锚定日期（原始销售日期）、呼叫频率（7,14 或 21 天）的表。我需要使用客户特定的锚日期和频率来创建未来的通话记录并将其添加到表中，直到定义的结束日期。我正在使用 SQL 2008

Answer 1

这看起来像一个开始：

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 )