Stéphane A. Schildknecht wrote: > Trying to identify last modified (updated or inserted) rows in a table, I > thought I could use xmin. > > I tried is to get some lines sorted by xmin. > > When doing it on a slonified database, I had no problem getting these lines. > > But, trying the same query on a non slonified DB, I got an error, as there is > no ordering operator for xid. > > I think that in the slon case, the query uses the implicit cast xid->xxid, and > then the operator to sort xxid. > > What would be the best way to get last modified rows? > > What I tried : > db=# select id_table, date_table, code_table from tb_table order by xmin desc limit 10; > ERROR: could not identify an ordering operator for type xid > ASTUCE : Use an explicit ordering operator or modify the query. What about: test=> SELECT xmin, * FROM mausi ORDER BY xmin::text::bigint; xmin | id | val -------+----+---------------- 14005 | 1 | test\test/test 14040 | 3 | mamma (2 rows) Yours, Laurenz Albe -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
