From: | "Sebastian P(dot) Luque" <spluque(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | column information from view |
Date: | 2018-09-14 21:35:42 |
Message-ID: | 87in373gpd.fsf@gmail.com |
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Thread: | |
Lists: | pgsql-general |
Hello,
I'm trying to generate a table with information on columns from a
temporary view that simply selects a subset of columns from a persistent
view in a given schema. The persistent view joins a number of tables
with columns that may or may not have a description entered. I need a
table with a list of columns from the temporary view, and the matching
descriptions from the underlying persistent view.
Here's my attempt at listing the temporary view's columns and respective
descriptions:
SELECT cols.ordinal_position, cols.column_name,
col_description(cl.oid, cols.ordinal_position::INT)
FROM pg_class cl, information_schema.columns cols
WHERE cols.table_catalog='dbname' AND cols.table_schema='some_schema' AND
cols.table_name = 'persistent_view' AND cols.table_name = cl.relname
ORDER BY cols.ordinal_position::INT;
The problem, of course, is that it lists columns from the persistent
view, instead of the subset of them in the temporary view. Is there a
better way to do that? Hopefully this makes sense.
Thanks,
--
Seb
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