SQL Server While遍历日期

需求

需要将一个时间段的天数全部遍历

了解While函数, dateadd()函数

While{...}

WHILE condition
BEGIN
   {...statements...}
END;

当condition满足的时候,一直执行statements

DATEADD(interval, number, date)

• interval 新增的单位时间,如年(year),月(month),日(day)
• number 新增的数量级
• date 初始时间

实现

declare @beg varchar(20),@end varchar(20)
select @beg = '2016-11-01',@end = '2016-11-15'

declare @begDate datetime = cast(@beg as datetime),@endDate datetime = cast(@end as datetime)
if DATEDIFF(DAY,@begDate,@endDate) < 0
begin
 print '结束时间小于开始时间'
 return;
end
DECLARE @newDate datetime
select @newDate = dateadd(day,0,@begDate)

WHILE (DATEDIFF(DAY,@newDate,@endDate) >=0 )
begin
 print convert(varchar(20),@newDate,120)
 
 select @newDate = dateadd(day,1,@newDate)

end

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