SQL在一行中选择不同的两列输出

COMPANY BUSINESS CONTACT1 CONTACT2 ABC CL [email protected] [email protected] ABC YM [email protected] [email protected] ABC ZF [email protected] [email protected] XYZ CL [email protected] [email protected] XYZ YM [email protected] [email protected] GEF CL [email protected] [email protected]

COMPANY CONTACT ABC [email protected],[email protected],[email protected],[email protected] XYZ [email protected],[email protected],[email protected] GEF [email protected],[email protected]

with 
    inputs (company, business, contact1, contact2) as (
     select 'ABC', 'CL', '[email protected]', '[email protected]' from dual union all 
     select 'ABC', 'YM', '[email protected]', '[email protected]' from dual union all 
     select 'ABC', 'ZF', '[email protected]', '[email protected]' from dual union all 
     select 'XYZ', 'CL', '[email protected]', '[email protected]' from dual union all 
     select 'XYZ', 'YM', '[email protected]', '[email protected]' from dual union all 
     select 'GEF', 'CL', '[email protected]', '[email protected]' from dual 
    ) 
-- end of test data; SQL solution begins below this line 
select company, listagg(email, ',') within group (order by email) as email_list 
from (
     select distinct company, email 
     from inputs 
     unpivot (email for col in (contact1, contact2)) 
     ) 
group by company 
; 

COMPANY EMAIL_LIST 
------- -------------------------------------------------------- 
ABC  [email protected],[email protected],[email protected],[email protected] 
GEF  [email protected],[email protected] 
XYZ  [email protected],[email protected],[email protected]

来源

2017-03-17 19:01:16 mathguy

是辉煌！ – hackvan

SELECT company , listagg(emails, ',') WITHIN GROUP (ORDER BY emails) as emails 
FROM (
    SELECT DISTINCT company, contact1 AS emails FROM yourtable 
    UNION 
    SELECT DISTINCT company, contact2 AS emails FROM yourtable 
) tt 
GROUP BY company

来源

2017-03-17 19:17:30

请注意，您不需要SELECT ** DISTINCT **;无论如何，UNION都会重复删除结果。我们的解决方案之间的差异是我使用UNPIVOT的方式。好处可能不会立即显现;事实上，UNPIVOT只能读取一次基表，而UNION方法需要读取两次基表（导致更多的I/O，这很昂贵）。 – mathguy

SQL在一行中选择不同的两列输出

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