Web Reference: Feb 26, 2026 · 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. Jul 23, 2025 · When working with databases, there are scenarios where you need a column’s value to be automatically computed based on other columns. In PostgreSQL, this can be achieved through generated columns. These special columns are calculated based on an expression using other columns in the table. Generated columns maintain access privileges separately from their underlying base columns. You can arrange for a particular role to only read from a generated column but not from the underlying base columns. Generated columns are updated after BEFORE triggers have run.
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