On Thu, Aug 31, 2017 at 12:16:43AM -0400, Peter Eisentraut wrote: > In previous discussions, it has often been a source of confusion whether > these generated columns are supposed to be computed on insert/update and > stored, or computed when read. The SQL standard is not explicit, but > appears to lean toward stored. DB2 stores. Oracle computes on read.
Question: How would one know the difference between storing computed columns vs. computing them on read? Answer?: Performance. If the computation is slow, then you'll really notice on read. Nico -- -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers