加入自己的表并在Sql中选择一行

Question

我有一张叫做“通话”的桌子， 列是：

a_imei_number (imei of caller)
b_imei_number (imei of number which is called)
a_phone_number (number of caller)
b_phone_number (number of number which is called)
call_start_time (as hour)
call_end_time (as hour)
call_day (as day)

我正在尝试查找克隆 Imei 号码的电话，因此在相交时间必须至少有 2 行，因此 phone_numbers 必须不同，imei_numbers 相同。喜欢

id   a_imei  b_imei  a_phone   b_phone   call_start_time  call_end_time  call_day 
1    A       b       123       321        13:30            13:50          01.02.2014
2    A       c       999       888        13:41            13:55          01.02.2014

我怎样才能单独加入该表？

注意：一行的 a_imei 可能与另一行的 b_imei 相同，因为可能一个克隆电话正在呼叫，而该电话的克隆被某人呼叫。

Answer 1

以下是获取所有 a_imei 克隆的方法：

SELECT  c1.*
FROM    calls As c1
JOIN    calls As c2
    ON  c1.a_imei           =   c2.a_imei
    AND c1.a_phone          !=  c2.a_phone
    AND c1.call_start_time  <   c2.call_end_time
    AND c1.call_end_time    >   c2.call_start_time
ORDER BY c1.a_imei, c1.call_start_time, c1.call_end_time

---

以下是比较“a”和“b”的方法：

SELECT  c1.*, c2.*
FROM    calls As c1
JOIN    calls As c2
    ON  c1.call_start_time < c2.call_end_time
    AND c1.call_end_time   > c2.call_start_time
    AND (   (c1.a_imei     = c2.a_imei AND c1.a_phone != c2.a_phone)
        OR  (c1.a_imei     = c2.b_imei AND c1.a_phone != c2.b_phone)
        OR  (c1.b_imei     = c2.a_imei AND c1.b_phone != c2.a_phone)
        OR  (c1.b_imei     = c2.b_imei AND c1.b_phone != c2.b_phone)
        )
ORDER BY c1.a_imei, c1.call_start_time, c1.call_end_time, c1.b_imei