-----Original Message----- From: Magnus Hagander [mailto:mag...@hagander.net] Sent: Saturday, December 31, 2011 7:42 AM To: Sahagian, David Cc: pgsql-docs@postgresql.org Subject: Re: [DOCS] CREATE TABLE LIKE, regarding constraints
On Fri, Dec 30, 2011 at 22:27, <david.sahag...@emc.com> wrote: > www.postgresql.org/docs/9.0/static/sql-createtable.html > == == == == == > LIKE parent_table [ like_option ... ] > . . . > Not-null constraints are always copied to the new table. > CHECK constraints will only be copied if INCLUDING CONSTRAINTS is specified; > other types of constraints will never be copied. > . . . > == == == == == > > But I do see PK and UNIQUE constraints > CONSTRAINT blah_pkey PRIMARY KEY (id), > CONSTRAINT blah_host_id_key UNIQUE (host_id) > in the def of the new table. Can you provide the commands you ran to make that happen? It doesn't happen for me in a trivial test. > Also, why is there no discussion of what "EXCLUDING CONSTRAINTS" will result > in ? -- Magnus Hagander Me: http://www.hagander.net/ Work: http://www.redpill-linpro.com/ Magnus, I did some more "testing" of CREATE TABLE LIKE, and now see that [INCLUDING INDEXES] also can cause PRIMARY KEY and UNIQUE constraints to become part of the new table. ++++++++++++++ CREATE TABLE yesConstr_noIndex_tbl ( like mytbl INCLUDING DEFAULTS INCLUDING CONSTRAINTS INCLUDING STORAGE ); ++++++++++++++ no PRIMARY KEY no UNIQUE no indexes ++++++++++++++ CREATE TABLE noConstr_yesIndex_tbl ( like mytbl INCLUDING DEFAULTS INCLUDING INDEXES INCLUDING STORAGE ); ++++++++++++++ NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "mytbl_pkey" for table "mytbl" NOTICE: CREATE TABLE / UNIQUE will create implicit index "mytbl_host_id_key" for table "mytbl" CONSTRAINT mytbl_pkey PRIMARY KEY (id), CONSTRAINT mytbl_host_id_key UNIQUE (host_id) and 2 unrelated indexes: (a_diff_col) (yet_a_diff_col) I have no problem with this behavior, but the doc probably deserves some clarification on the "relationship" between [INCLUDING CONSTRAINTS] and [INCLUDING INDEXES]. Thanks, -dvs- -- Sent via pgsql-docs mailing list (pgsql-docs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-docs
