Re: [GENERAL] How to create primary key
On Nov 6, 2007, at 1:15 AM, Raymond O'Donnell wrote: On 06/11/2007 08:54, Reg Me Please wrote: What'd be the syntax to create a primary key on an already build table? ALTER TABLE test ADD CONSTRAINT test_pk PRIMARY KEY (f1); So, ALTER TABLE test ADD PRMARY KEY(f1 [, ... ] ) isn't enough? It appears in the examples. What more does the explicit test_pk do that wouldn't happen anyway? - samantha ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [GENERAL] How to create primary key
On 06/11/2007 08:54, Reg Me Please wrote: What'd be the syntax to create a primary key on an already build table? ALTER TABLE test ADD CONSTRAINT test_pk PRIMARY KEY (f1); http://www.postgresql.org/docs/8.2/static/sql-altertable.html --- Raymond O'Donnell, Director of Music, Galway Cathedral, Ireland [EMAIL PROTECTED] --- ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
[GENERAL] How to create primary key
Hi all. What'd be the syntax to create a primary key on an already build table? Thanks. -- Reg me Please ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [GENERAL] How to create primary key
On Tue, Nov 06, 2007 at 01:38:31AM -0800, Samantha Atkins wrote: On Nov 6, 2007, at 1:15 AM, Raymond O'Donnell wrote: On 06/11/2007 08:54, Reg Me Please wrote: What'd be the syntax to create a primary key on an already build table? ALTER TABLE test ADD CONSTRAINT test_pk PRIMARY KEY (f1); So, ALTER TABLE test ADD PRMARY KEY(f1 [, ... ] ) isn't enough? It appears in the examples. What more does the explicit test_pk do that wouldn't happen anyway? It's not needed. It gives a name to the primary key. If you don't specify one, the system will pick one for you automatically. //Magnus ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org/
Re: [GENERAL] How to create primary key
Reg Me Please wrote: Hi all. What'd be the syntax to create a primary key on an already build table? Hmm - so you want to sort of alter a table and add a primary key constraint to an existing column? ALTER TABLE my_table ADD PRIMARY CONSTRAINT (existing_column); All in the manuals: http://www.postgresql.org/docs/8.2/static/sql-altertable.html -- Richard Huxton Archonet Ltd ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [GENERAL] How to create primary key
On 06/11/2007 09:38, Samantha Atkins wrote: So, ALTER TABLE test ADD PRMARY KEY(f1 [, ... ] ) isn't enough? It appears in the examples. What more does the explicit test_pk do that wouldn't happen anyway? confession To make sure I got it right, I tried it out using PgAdmin and copied the generated SQL into my email - hence the pedantically complete statement. :-) /confession Ray. --- Raymond O'Donnell, Director of Music, Galway Cathedral, Ireland [EMAIL PROTECTED] --- ---(end of broadcast)--- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
Re: [GENERAL] How to create primary key
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 11/06/07 03:15, Richard Huxton wrote: Reg Me Please wrote: Hi all. What'd be the syntax to create a primary key on an already build table? Hmm - so you want to sort of alter a table and add a primary key constraint to an existing column? While I understand your feelings, I must disagree. That's because adding a secondary index does not have the same sort of syntax: ALTER TABLE foo ADD INDEX (some, existing, columns); ALTER TABLE my_table ADD PRIMARY CONSTRAINT (existing_column); All in the manuals: http://www.postgresql.org/docs/8.2/static/sql-altertable.html - -- Ron Johnson, Jr. Jefferson LA USA Give a man a fish, and he eats for a day. Hit him with a fish, and he goes away for good! -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHMFr/S9HxQb37XmcRAuqfAKCzmYeBU4dVXorvQxBUYIoQuw9YcgCeOve1 NUtFo4N/sC4julpZmMvLN0s= =qcCO -END PGP SIGNATURE- ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org/
Re: [GENERAL] How to create primary key
Reg Me Please wrote: What'd be the syntax to create a primary key on an already build table? As described in the documentation: ALTER TABLE name ADD [CONSTRAINT constraint name] PRIMARY KEY (colname [, ...]) [WITH (FILLFACTOR = number)] [USING INDEX TABLESPACE tbsp name] Yours, Laurenz Albe ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [GENERAL] How to create primary key
Albe Laurenz wrote: Richard Huxton wrote: What'd be the syntax to create a primary key on an already build table? ALTER TABLE my_table ADD PRIMARY CONSTRAINT (existing_column); I'm sure it's just a typo, but that is wrong. It is not ADD PRIMARY CONSTRAINT, but ADD PRIMARY KEY. It is indeed a typo. Thanks Albe. Particularly irritating as I'd bothered give a link to the right manual page too... -- Richard Huxton Archonet Ltd ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [GENERAL] How to create primary key
Richard Huxton wrote: What'd be the syntax to create a primary key on an already build table? ALTER TABLE my_table ADD PRIMARY CONSTRAINT (existing_column); I'm sure it's just a typo, but that is wrong. It is not ADD PRIMARY CONSTRAINT, but ADD PRIMARY KEY. Yours, Laurenz Albe ---(end of broadcast)--- TIP 6: explain analyze is your friend
