From: | GPT <gptmailinglists(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | Adding an extra boolean column to "information_schema.columns" or "pg_attribute" |
Date: | 2017-12-30 19:17:34 |
Message-ID: | CADep2PN8vide36zQe5X+kTh5BFKkCudKTOM+C_J2KUSDnN5L7Q@mail.gmail.com |
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Lists: | pgsql-general |
I would like to add an extra boolean attribute to table columns,
something like NULL. Unfortunately Pg does not support such a feature:
ADD ATTRIBUTE <attribute_name> TYPE <type_of_attribute> TO COLUMN
<schema.table.column_name>;
For example:
ADD ATTRIBUTE is_displayed TYPE boolean TO COLUMN world.human.feature;
so that I can write:
SELECT column_name FROM information_schema.columns
WHERE table_schema = world AND table_name = 'human' AND is_displayed = 'Yes';
Please let me know if there would be any failure of an internal part
or other real technical problem in case I add this extra column by
hand and all relevant stuffs (index, maybe constraint) to either
"information_schema.columns" or "pg_attribute".
I have already been suggested to use VIEW or dynamic SQL but I am
looking something different.
Tia
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