在<；15分钟和15到30分钟的sql查询

表名称客户访问

CustomerId, phoneMacAddress,  CreateDatetime 
1002        1b:66:41:11:26:16  2017-07-17 07:33:31.300
1003        cb:45:85:25:2:0    2017-07-17 07:05:21.200
1004        3o:09:ab:1c:5:ab   2017-07-17 10:03:01.400
1002        1b:66:41:11:26:16  2017-07-17 08:12:03.543
1002        1b:66:41:11:26:16  2017-07-17 08:12:03.543
1002        1b:66:41:11:26:16  2017-07-17 08:09:27.527

如何获取此格式的数据：

<15min      15-30min      >30min
1           4             0 

30min
1           4             0 

SQL SERVER的更新

#Last 15 mins
SELECT COUNT(CustomerId) FROM customer_visit WHERE CreateDatetime >= DateADD(mi, -15, CURRENT_TIMESTAMP) and CreateDatetime <= CURRENT_TIMESTAMP;

#Between 15 to 30 min
SELECT COUNT(CustomerId) FROM customer_visit WHERE CreateDatetime >= DateADD(mi, -30, CURRENT_TIMESTAMP) and CreateDatetime <= DateADD(mi, -15, CURRENT_TIMESTAMP);

#最后15分钟
从customer_Visition中选择COUNT（CustomerId），其中CreateDatetime>=DateADD（mi，-15，CURRENT_TIMESTAMP）和CreateDatetime=DateADD（mi，-30，CURRENT_TIMESTAMP）以及CreateDatetime=DATE_SUB（UTC_TIMESTAMP（），INTERVAL 15分钟）和CreateDatetime您可以使用
lead（）
和一些日期/时间算法。大概是这样的：

select sum(case when next_cdt < dateadd(minute, 15, CreateDateTime) then 1
                else 0 end) as [<15min],
       sum(case when next_cdt >= dateadd(minute, 15, CreateDateTime) and
                     next_cdt < dateadd(minute, 30, CreateDateTime)
                then 1
                else 0 end) as [15-30min],
       sum(case when next_cdt >= dateadd(minute, 30, CreateDateTime) then 1
                else 0 end) as [<30min]  
from (select t.*,
             lead(CreateDatetime) over (order by CreateDatetime) as next_cdt
      from t
     ) t;

选择sum（当next_cdt=dateadd（分钟，30，CreateDateTime）时为1
else 0 end）as[描述如何计数？您的示例数据有3个不同的用户，但您仍然希望4个用户作为计数（15-30分钟）。我需要查询sql Server特定于产品的答案，以回答一个没有指定dbms的问题。至少告诉我们这是针对哪个产品的。
select sum(case when next_cdt < dateadd(minute, 15, CreateDateTime) then 1
                else 0 end) as [<15min],
       sum(case when next_cdt >= dateadd(minute, 15, CreateDateTime) and
                     next_cdt < dateadd(minute, 30, CreateDateTime)
                then 1
                else 0 end) as [15-30min],
       sum(case when next_cdt >= dateadd(minute, 30, CreateDateTime) then 1
                else 0 end) as [<30min]  
from (select t.*,
             lead(CreateDatetime) over (order by CreateDatetime) as next_cdt
      from t
     ) t;