Mysql 查找重复呼叫

我想从下面的数据表中找出重复呼叫。有电话吗 当有人为同一问题调用结果再次调用时，计数为重复

UCID    Phone_Number    Call_Time   Call_Outcome    Call_ID Skill_Name
121312  01819202020      11:11  Balance              1231   Corporate
121310  01819202020      11:11  Call drop            1231   Corporate
413921  01819202020      01:21  balance              3212   corporate
213412  01819202020      01:32  Call drop            2312   corporate
213412  01819202020      01:32  Goon goon            2312   corporate
987654  01823898989      04:12  Gprs                 2345   IR
434323  01823898989      05:12  Gprs                 2131   IR
213143  01819202020      06:23  Goon                 5676   corporate
213143  01819202020      06:23  balance              5676   corporate

结果如下所示

SkillName   Ans Repeat
Cor          4   3
IR           2   1

我尝试了以下查询，但没有给出确切的结果

select left(Skill_Name,3)as SkillName, count(call_Id) as Ans, 
count(UCID) as RepeatCall 
from(select UCID, Phone_Number, Skill_Name, Call_Outcome,     count(Call_Outcome)-1 as cqc 
from cdr where UCID IN (SELECT A.UCID FROM cdr A INNER JOIN (SELECT Phone_Number, Call_Outcome
 FROM cdr GROUP BY Phone_Number, Call_Outcome HAVING COUNT(*) > 1) B ON   A.Phone_Number = B.Phone_Number AND A.Call_Outcome = B.Call_Outcome 
ORDER BY `A`.`Phone_Number`) 
group by Phone_Number, Call_Outcome)As rep
 where cqc<>0 group by SkillName;

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Call_ID需要添加到第一个嵌套的select语句中。是的，你说得对。但是时间还有一个问题，这里我必须使用最小通话时间来计算准确的重复通话号码。但是我不能准确地使用这个条件