oracle查询中的重复项

Question

我有以下查询来获取重复的 ssn 和重复的计数。但是同一张表中不同的 login_id 使用相同的 ssn 是有可能的。

Select distinct SOCIALSECURITY, count(*) from PROCESS 
WHERE SOCIALSECURITY IS NOT NULL and PROCESS_NAME = 'NEW_ACCOUNT'
GROUP BY SOCIALSECURITY HAVING COUNT(SOCIALSECURITY) > 1;

我正在寻找的是获取使用相同 SOCIALSECURITY 的 Login_id 以及它使用了多少次。

例如：LOGIN_ID、SSN、PROCESS_NAME

john123 | 123-45-7890 | 'NEW_ACCOUNT'
john123 | 123-45-7890 | 'NEW_BUSINESS'
johnbaker123 | 123-45-7890 | 'NEW_ACCOUNT'
zeechan | 647-000-0000 | 'NEW_ACCOUNT'

我想得到类似的结果

123-45-7890 | 2

Answer 1

您可以使用以下查询 -

SELECT SOCIALSECURITY, count(*)
  FROM PROCESS 
 WHERE SOCIALSECURITY IS NOT NULL
   AND PROCESS_NAME = 'NEW_ACCOUNT'
 GROUP BY LOGIN_ID, SOCIALSECURITY
HAVING COUNT(SOCIALSECURITY) > 1;

Answer 2

我看到的是count(distinct login_id)你在找。

SQL> with test (login_id, ssn, process_name) as
  2    (select 'john123'     , '123-45-7890', 'NEW_ACCOUNT'  from dual union all
  3     select 'john123'     , '123-45-7890', 'NEW_BUSINESS' from dual union all
  4     select 'johnbaker123', '123-45-7890', 'NEW_ACCOUNT'  from dual union all
  5     select 'zeechan'     , '647-00-0000', 'NEW_ACCOUNT'  from dual
  6    )
  7  select ssn, count(distinct login_id) cnt
  8  from test
  9  group by ssn
 10  having count(*) > 1;

SSN                CNT
----------- ----------
123-45-7890          2

SQL>