On 02/01/2008, Matthew Wilson <matt@xxxxxxxxxx> wrote: > On Wed 02 Jan 2008 04:23:46 AM EST, Pavel Stehule wrote: > > Hello > > > > IDEA 3: > > > > Use two hash functions: > > > > CREATE UNIQUE INDEX uidx ON TEST((decode(md5(a),'hex')),(hashtext(a))); > > > > removing spaces helps > > CREATE UNIQUE INDEX uidx ON test((decode(md5(lower(replace(a,' ',''))),'hex'))); > > > > Regards > > Pavel Stehule > > > > CREATE UNIQUE INDEX nodups on MESSAGE (my_timestamp_col, md5(my_text_col)); > > What is the advantage of this method? > much less unique index. Regards Pavel > -- > Programming, economics, gardening, life in Cleveland. > http://blog.tplus1.com > > > ---------------------------(end of broadcast)--------------------------- > TIP 4: Have you searched our list archives? > > http://archives.postgresql.org/ > ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to majordomo@xxxxxxxxxxxxxx so that your message can get through to the mailing list cleanly
