Question

输入数据

   Some_Table
   ST_Field1   ST_Field2
   Apple       A
   Apple       A
   Apple       D
   Orange      D
   Orange      E
   Orange      Z
   Pear        D
   Pear        G 
   Pear        C

   Reference_Table
   RT_Field1   RT_Field2
   1           A
   1           B
   1           C
   2           D
   2           E
   2           F
   3           G

预期结果：

   ST_Field1   ST_Field2
   Orange      D
   Orange      E

CREATE TABLE SOME_TABLE
  ( ST_Field1 VARCHAR(100),
    ST_Field2 VARCHAR(100)
  );

INSERT INTO SOME_TABLE VALUES ('Apple','A');
INSERT INTO SOME_TABLE VALUES ('Apple','A');
INSERT INTO SOME_TABLE VALUES ('Apple','D');
INSERT INTO SOME_TABLE VALUES ('Orange','D');
INSERT INTO SOME_TABLE VALUES ('Orange','E');
INSERT INTO SOME_TABLE VALUES ('Orange','Z');
INSERT INTO SOME_TABLE VALUES ('Pear','D');
INSERT INTO SOME_TABLE VALUES ('Pear','G');
INSERT INTO SOME_TABLE VALUES ('Pear','C');

CREATE TABLE REFERENCE_TABLE
  ( RT_Field1 INTEGER,
    RT_Field2 VARCHAR(100)
  );

INSERT INTO REFERENCE_TABLE VALUES (1,'A');
INSERT INTO REFERENCE_TABLE VALUES (1,'B');
INSERT INTO REFERENCE_TABLE VALUES (1,'C');
INSERT INTO REFERENCE_TABLE VALUES (2,'D');
INSERT INTO REFERENCE_TABLE VALUES (2,'E');
INSERT INTO REFERENCE_TABLE VALUES (2,'F');
INSERT INTO REFERENCE_TABLE VALUES (3,'G');

可以假定RT_Field2是唯一的。

我希望从Some_Table获取记录，这些记录具有RT_Field2的多个不同值，并按RT_Field1和ST_Field1分组。

因此，从参考表{A，B，C}中进行分组。我想查看给定的ST_Field1是否看到{A，B}; {B，c}，{A，C}。我没有，我看到A和C，但是在Apple和Pear之间。

唯一的成功是Orange，我在这里寻找{D，E}，{D，F}或{E，F}，并找到Orange的D和E。

我有：

WITH DUP_VALUES_RTF2 AS
  ( SELECT * 
      FROM (SELECT DST.ST_Field1,
                   DST.ST_Field2,
                   COUNT(1) OVER (PARTITION BY RT.RT_Field1) cnt_RTF1
              FROM (SELECT DISTINCT
                           ST_Field1,
                           ST_Field2
                      FROM Some_Table
                   ) DST
             INNER
              JOIN REFERENCE_TABLE RT
                ON DST.ST_Field2 = RT.RT_Field2
           ) TMP
     WHERE cnt_RTF1 > 1
  )
SELECT * 
  FROM SOME_TABLE ST
 WHERE EXISTS
         ( SELECT 1
             FROM DUP_VALUES_RTF2 DVR
            WHERE ST.ST_Field1 = DVR.ST_Field1
              AND ST.ST_Field2 = DVR.ST_Field2
         );

什至没有真正接近，因为它根本无法正确处理分组并且非常丑陋。也许下午5点以后我就快要死了。

Answer 1

您可以尝试以下类似操作

; with distinctSet as 
(select distinct s.*,RT_Field1 from SOME_TABLE s join REFERENCE_TABLE r on s.ST_Field2=r.RT_Field2
)
, 
uniqueSet as 
(
select RT_Field1,ST_Field1 
from distinctSet
group by RT_Field1,ST_Field1
having count(1)>1
),
resultSet as 
(
select
distinct 
s.*
from SOME_TABLE s 
join REFERENCE_TABLE r 
on s.ST_Field2=r.RT_Field2
join uniqueSet u
on u.RT_Field1=r.RT_Field1
and u.ST_Field1=s.ST_Field1
)
select * from resultSet

Answer 2

如果我正确理解这一点，则想匹配st_field1和rt_field1，在rt_field2中查找重复项。您可以为此使用窗口功能：

select s.*
from (select s.*, rt.rt_field1, rt.rt_field2,
             min(rt.rt_field2) over (partition by s.st_field1, r.rt_field1) as min_rt2,
             max(rt.rt_field2) over (partition by s.st_field1, r.rt_field1) as max_rt2             
      from sometable s join
           reference_table r
           on s.st_field2 = r.rt_field2
     ) s
where min_rt2 <> max_rt2;

按组检查多个不同的事件

2 个答案: