Sqlite-如果只有连续记录计数的单个记录有相同的号码继续获取，我如何像呼叫日志一样查询

Question

UniqueID | MobileNumber | createDate
-----------+---------+-----+------------+-----------
U_23121  | 987654        | 2013-02-05 
U_23124  | 987654        | 2013-02-02 
U_23122  | 845263        | 2013-01-18 
U_23128  | 654789        | 2013-01-16 
U_23123  | 735689        | 2013-01-12 
U_23128  | 654789        | 2013-01-11 
U_23128  | 654789        | 2013-01-10 
U_23126  | 987654        | 2013-01-09 
U_23125  | 845263        | 2013-01-07 
U_23126  | 845263        | 2013-01-06 
U_23125  | 987654        | 2013-01-05 

我想用手机号码记录过滤，如果不止一个继续根据createdDate获取最新信息，并像一样获取计数

UniqueID | Mobile_Number | createDate   | count
-----------+---------+-----+------------+-----------
U_23121  | 987654        | 2013-02-05   | 2
U_23122  | 845263        | 2013-01-18   | 1
U_23128  | 654789        | 2013-01-16   | 1
U_23123  | 735689        | 2013-01-12   | 1
U_23128  | 654789        | 2013-01-11   | 2
U_23126  | 987654        | 2013-01-09   | 1
U_23125  | 845263        | 2013-01-07   | 2
U_23125  | 987654        | 2013-01-05   | 1

我会从下面的查询中得到需要的记录，但不会得到计数

SELECT te.*
FROM tableName as te
WHERE te.Mobile_Number <> (select Mobile_Number 
from tableName
where createDate > te.createDate
limit 1
)
ORDER BY te.createDate DESC

Answer 1

这是一个缺口和孤岛问题。一种解决方案是为每一行分配一个"grp"，然后按该组进行聚合。

您可以通过计算每行(直到该行)中与移动电话号码不同的移动电话号码的数量来分配grp。这是相邻手机号码的常数值。

结果查询：

SELECT MAX(UniqueId), MobileNumber,
MAX(createDate), COUNT(*)
FROM (SELECT te.*,
(SELECT COUNT(*)
FROM tableName te2
WHERE te2.createDate < te.createDate AND
te2.MobileNumber <> te.MobileNumber
) as grp
FROM tableName te
) te
GROUP BY MobileNumber, grp;
ORDER BY MIN(tcreateDate) DESC

Answer 2

好的，这是缺口和孤岛问题。如果Sqllite支持row_number函数(3.25及更高版本)，则可以使用以下方法

select MobileNumber, max(createDate), count(*)
from
(
select *,
row_number() over (order by createDate) -
row_number() over (partition by MobileNumber order by createDate) grp
from data
) t
group by grp, MobileNumber

Answer 3

通过使用组

SELECT te.* FROM tableName as te where te.Mobile_Number != (select Mobile_Number from tableName where createDate > te.createDate limit 1) GROUP BY Mobile_Number  ORDER BY te.createDate DESC