https://nalar.dev/tags/postgresql-18/ Recent content in PostgreSQL 18 on Nalar Hugo en-us Tue, 15 Sep 2026 00:00:00 +0700 https://nalar.dev/postgresql-virtual-generated-columns-compute-values-at-read-time/ Tue, 15 Sep 2026 00:00:00 +0700 https://nalar.dev/postgresql-virtual-generated-columns-compute-values-at-read-time/ <p>PostgreSQL 18 can keep a generated column out of the stored row entirely. A virtual generated column evaluates its expression when the column is read, while a stored generated column evaluates on write and occupies storage like an ordinary column. PostgreSQL 18 also makes the virtual form the default when neither <code>VIRTUAL</code> nor <code>STORED</code> is specified.</p> <p>That distinction changes where computation occurs and which expressions PostgreSQL accepts. It also affects triggers, inheritance, partitioning, and logical replication.</p>