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Subject: Virtual Generated Columns
Date: Fri, 05 Dec 2025 13:57:40 +0000
Message-ID: <[email protected]> (raw)
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/17/ddl-generated-columns.html
Description:
The documentation for generated columns in PostgreSQL versions prior to 18
mention "virtual" columns, but as far as I can tell, this is not available
prior to 18.
In v17, this is just in the first paragraph.
> A generated column is a special column that is always computed from other
columns. Thus, it is for columns what a view is for tables. There are two
kinds of generated columns: stored and virtual. A stored generated column is
computed when it is written (inserted or updated) and occupies storage as if
it were a normal column. A virtual generated column occupies no storage and
is computed when it is read. Thus, a virtual generated column is similar to
a view and a stored generated column is similar to a materialized view
(except that it is always updated automatically). PostgreSQL currently
implements only stored generated columns.
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