Using postgres to select a filtered array
I'm looking to select data from a table that contains an ID, and an array of values. But in the query results, i want to filter the array and remove values that overlap with a white list.
For illustrative purposes, the following query shows how the data would be formatted with a whitelist of values in a single column, and then a table i want to select from... that contains a unique ID, and the array of keywords.
with whitelist as (
select distinct unnest(array['a','b','c','f','h']) as keywords
), raw_with_keyword_array as (
select * from (
values
('1234', array['a','c','e','h','q']),
('1235', array['a','d','e','f'])
) as t (id, keyword_array)
)
select...
The expected results i'm looking for is two rows from the raw_with_keyword_array table, but filtered arrays not including the values from the whitelist.
I figure i probably need to select the data from the main table, and then do some kind of recursive sub query to filter out the whitelisted values, and put the results back into a new array?
Any suggestions would be appreciated!
E.g.
1234 {e, q}
1235 {d, e}
postgresql query array
asked 5 mins ago
Rob AlfordRob Alford
1
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Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm looking to select data from a table that contains an ID, and an array of values. But in the query results, i want to filter the array and remove values that overlap with a white list.
For illustrative purposes, the following query shows how the data would be formatted with a whitelist of values in a single column, and then a table i want to select from... that contains a unique ID, and the array of keywords.
with whitelist as (
select distinct unnest(array['a','b','c','f','h']) as keywords
), raw_with_keyword_array as (
select * from (
values
('1234', array['a','c','e','h','q']),
('1235', array['a','d','e','f'])
) as t (id, keyword_array)
)
select...
The expected results i'm looking for is two rows from the raw_with_keyword_array table, but filtered arrays not including the values from the whitelist.
I figure i probably need to select the data from the main table, and then do some kind of recursive sub query to filter out the whitelisted values, and put the results back into a new array?
Any suggestions would be appreciated!
E.g.
1234 {e, q}
1235 {d, e}
postgresql query array
asked 5 mins ago
Rob AlfordRob Alford
1
New contributor
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm looking to select data from a table that contains an ID, and an array of values. But in the query results, i want to filter the array and remove values that overlap with a white list.
For illustrative purposes, the following query shows how the data would be formatted with a whitelist of values in a single column, and then a table i want to select from... that contains a unique ID, and the array of keywords.
with whitelist as (
select distinct unnest(array['a','b','c','f','h']) as keywords
), raw_with_keyword_array as (
select * from (
values
('1234', array['a','c','e','h','q']),
('1235', array['a','d','e','f'])
) as t (id, keyword_array)
)
select...
The expected results i'm looking for is two rows from the raw_with_keyword_array table, but filtered arrays not including the values from the whitelist.
I figure i probably need to select the data from the main table, and then do some kind of recursive sub query to filter out the whitelisted values, and put the results back into a new array?
Any suggestions would be appreciated!
E.g.
1234 {e, q}
1235 {d, e}
postgresql query array
asked 5 mins ago
Rob AlfordRob Alford
1
New contributor
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm looking to select data from a table that contains an ID, and an array of values. But in the query results, i want to filter the array and remove values that overlap with a white list.
For illustrative purposes, the following query shows how the data would be formatted with a whitelist of values in a single column, and then a table i want to select from... that contains a unique ID, and the array of keywords.
with whitelist as (
select distinct unnest(array['a','b','c','f','h']) as keywords
), raw_with_keyword_array as (
select * from (
values
('1234', array['a','c','e','h','q']),
('1235', array['a','d','e','f'])
) as t (id, keyword_array)
)
select...
The expected results i'm looking for is two rows from the raw_with_keyword_array table, but filtered arrays not including the values from the whitelist.
I figure i probably need to select the data from the main table, and then do some kind of recursive sub query to filter out the whitelisted values, and put the results back into a new array?
Any suggestions would be appreciated!
E.g.
1234 {e, q}
1235 {d, e}
postgresql query array
postgresql query array
asked 5 mins ago
Rob AlfordRob Alford
1
New contributor
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 mins ago
Rob AlfordRob Alford
1
New contributor
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 mins ago
Rob AlfordRob Alford
1
New contributor
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 mins ago
Rob AlfordRob Alford
1
asked 5 mins ago
Rob AlfordRob Alford
1
1
New contributor
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Rob Alford is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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