Aggregate per Group returns Duplicates
I have the following scenario a user belongs to several Groups. The Groups are organized in a hierachy:
I want to aggregate all the Person Information of the Groups the User Belongs to. Eg. Person 1 belongs to Group 7. And Group 7 has connections to the following Groups 1,5,7,8 (complete branch)
I wrote the following query:
SELECT person.id, array_agg(info)
FROM person LEFT JOIN person_group
ON ARRAY[person.id] && path
LEFT JOIN person_information ON
ARRAY[person_information.id] && path
GROUP BY person.id;
Problem with this query is that I get duplicated Information:
I don't want to use UNIQUE on the array_agg(info) field. Rather I would like write my join so that I only get UNIQUE rows of the Person Information Table.
*How would I do that?*Thank you
postgresql query-performance query
asked 15 hours ago
John SmithJohn Smith
101
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add a comment |
I have the following scenario a user belongs to several Groups. The Groups are organized in a hierachy:
I want to aggregate all the Person Information of the Groups the User Belongs to. Eg. Person 1 belongs to Group 7. And Group 7 has connections to the following Groups 1,5,7,8 (complete branch)
I wrote the following query:
SELECT person.id, array_agg(info)
FROM person LEFT JOIN person_group
ON ARRAY[person.id] && path
LEFT JOIN person_information ON
ARRAY[person_information.id] && path
GROUP BY person.id;
Problem with this query is that I get duplicated Information:
I don't want to use UNIQUE on the array_agg(info) field. Rather I would like write my join so that I only get UNIQUE rows of the Person Information Table.
*How would I do that?*Thank you
postgresql query-performance query
asked 15 hours ago
John SmithJohn Smith
101
New contributor
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
It would be nice if you share your desired output. Thanks.
– Luan Huynh
13 hours ago
And maybe a dbfiddle
– dezso
12 hours ago
add a comment |
I have the following scenario a user belongs to several Groups. The Groups are organized in a hierachy:
I want to aggregate all the Person Information of the Groups the User Belongs to. Eg. Person 1 belongs to Group 7. And Group 7 has connections to the following Groups 1,5,7,8 (complete branch)
I wrote the following query:
SELECT person.id, array_agg(info)
FROM person LEFT JOIN person_group
ON ARRAY[person.id] && path
LEFT JOIN person_information ON
ARRAY[person_information.id] && path
GROUP BY person.id;
Problem with this query is that I get duplicated Information:
I don't want to use UNIQUE on the array_agg(info) field. Rather I would like write my join so that I only get UNIQUE rows of the Person Information Table.
*How would I do that?*Thank you
postgresql query-performance query
asked 15 hours ago
John SmithJohn Smith
101
New contributor
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have the following scenario a user belongs to several Groups. The Groups are organized in a hierachy:
I want to aggregate all the Person Information of the Groups the User Belongs to. Eg. Person 1 belongs to Group 7. And Group 7 has connections to the following Groups 1,5,7,8 (complete branch)
I wrote the following query:
SELECT person.id, array_agg(info)
FROM person LEFT JOIN person_group
ON ARRAY[person.id] && path
LEFT JOIN person_information ON
ARRAY[person_information.id] && path
GROUP BY person.id;
Problem with this query is that I get duplicated Information:
I don't want to use UNIQUE on the array_agg(info) field. Rather I would like write my join so that I only get UNIQUE rows of the Person Information Table.
*How would I do that?*Thank you
postgresql query-performance query
postgresql query-performance query
asked 15 hours ago
John SmithJohn Smith
101
New contributor
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 15 hours ago
John SmithJohn Smith
101
New contributor
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 15 hours ago
John SmithJohn Smith
101
New contributor
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 15 hours ago
John SmithJohn Smith
101
asked 15 hours ago
John SmithJohn Smith
101
101
New contributor
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
John Smith is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
It would be nice if you share your desired output. Thanks.
– Luan Huynh
13 hours ago
And maybe a dbfiddle
– dezso
12 hours ago
add a comment |
1
It would be nice if you share your desired output. Thanks.
– Luan Huynh
13 hours ago
And maybe a dbfiddle
– dezso
12 hours ago
1
1
It would be nice if you share your desired output. Thanks.
– Luan Huynh
13 hours ago
It would be nice if you share your desired output. Thanks.
– Luan Huynh
13 hours ago
And maybe a dbfiddle
– dezso
12 hours ago
And maybe a dbfiddle
– dezso
12 hours ago
add a comment |
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1
It would be nice if you share your desired output. Thanks.
– Luan Huynh
13 hours ago
And maybe a dbfiddle
– dezso
12 hours ago