Thread: Extracting data from the view to retrieve the foreign key is not declared
Given a view, I need to extract tables, the join columns (ON) . I need to do this analysis because of the view (agreements with the join condition and where) I can say that there is a foreign key Example: CREATE OR REPLACE VIEW x_customer AS SELECT a.asset_id, a.client_id FROM asset_d ad, asset a ON asset_id = ad.asset_id Result: NAMEVIEW |TABLE1 | COLUMN1 | TABLE2 | COLUMN2 x_customer| asset_d | asset_id | asset | asset_id | x_customer| asset | - | - | - | OR CREATE OR REPLACE VIEW x_customer AS SELECT a.asset_id, a.client_id, a.org_id, a.isactive, a.created, a.createdby, a.updated, a.updatedby, a.value, a.name, a.description, a.ad_user_id, ( SELECT count(*) AS count FROM asset_d ad WHERE a.asset_id = ad.asset_id) AS deliverycount FROM asset a WHERE a.bpartner_id IS NOT NULL; Result: NAMEVIEW |TABLE1 | COLUMN1 | TABLE2 | COLUMN2 x_customer| asset_d | asset_id | asset | asset_id | Someone can help me? Thanks -- View this message in context: http://postgresql.1045698.n5.nabble.com/Extracting-data-from-the-view-to-retrieve-the-foreign-key-is-not-declared-tp5795408.html Sent from the PostgreSQL - general mailing list archive at Nabble.com.
Re: Extracting data from the view to retrieve the foreign key is not declared
From
Albe Laurenz
Date:
nill wrote: > Given a view, I need to extract tables, the join columns (ON) . I need to do > this analysis because of the view (agreements with the join condition and > where) I can say that there is a foreign key Do I understand right that you want to find out the tables involved in a view definition? Maybe querying pg_depend can help, since there are dependency relationships between the view and its query rewrite rule, but also between the rule and the columns of the underlying tables. Yours, Laurenz Albe
Laurenz Thanks for your reply, it is going to help me. I use this query to get the dependencies of view with the objects in the db SELECT * FROM INFORMATION_SCHEMA.view_column_usage I now have to explain the attributes of the join tree, that is JOIN expressions e JOIN clauses. Thanks -- View this message in context: http://postgresql.1045698.n5.nabble.com/Extracting-data-from-the-view-to-retrieve-the-foreign-key-is-not-declared-tp5795408p5795524.html Sent from the PostgreSQL - general mailing list archive at Nabble.com.