postgresql - SQL to find duplicate foreign keys in a group -


Originally with tables: 

  element ID INT primary key ... Overview ID INT primary key ... Data ID INT Primary key view_ID floats key key element_id foreign key price ...

I think all the observation_id Duplicate element_id s in overview_id . For example, if I have data record: 

  1 | 50 | 23 4.5 2 50 | 24 | 9.93 | 66 | 23 4.4 4 66 | 23 4.1

will then report the query overview_id 66 because it contains element_id 23 .

(I am using PostgreSQL, but this is probably a basic SQL question.)

Use counting () Overall, with the 'Happening' section: 

 select_view, select element_id, Element_id count (*)> 1

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