> 1: Never add a column with a default value<p>This only applies to Postgres versions < 11. See <a href="https://blog.2ndquadrant.com/add-new-table-column-default-value-postgresql-11/" rel="nofollow">https://blog.2ndquadrant.com/add-new-table-column-default-va...</a> which was released after this article was written.