Re: [SQL] sysid
On Nov 23, 2005, at 10:45 AM, Alvaro Herrera wrote: A. R. Van Hook wrote: It seems that in 8.1.0 we can no longer set the SYSID when adding users and groups. i.e template1=# create role hooker sysid 1345; NOTICE: SYSID can no longer be specified I have lots of code that depends on the actual group and user number. Is there a way to set the user and group number? No -- fix the code. Just curious, how can user code depend on the SYSIDs? I don't see a way. If 8.1 doesn't allow you to remove a user who still has rights granted, then this should be no problem. however, in older versions you can delete users and leave dangling rights with no way to revoke them unless you create a user with that specific ID and then revoke the rights, and re-delete the user. ---(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: [SQL] Order of precedence between AND and OR.
David Pradier <[EMAIL PROTECTED]> writes: > But what I couldn't find is if there is an order of precedence between > AND and OR, that is if the AND expression is calculated before the OR > one, or anyelse way. AND first; see http://www.postgresql.org/docs/8.1/static/sql-syntax.html#SQL-PRECEDENCE This is required by the SQL spec. But you probably also want to read http://www.postgresql.org/docs/8.1/static/sql-expressions.html#SYNTAX-EXPRESS-EVAL regards, tom lane ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
[SQL] Order of precedence between AND and OR.
Hi everybody, during the code inspection due to our migration to 8.1, I found a piece of SQL code written like this : WHERE a AND b OR c AND d Now, I know that AND and OR are commutative because it's written in the docs. But what I couldn't find is if there is an order of precedence between AND and OR, that is if the AND expression is calculated before the OR one, or anyelse way. Could somebody tell me or point me to the right doc ? Thanks in advance, David -- David Pradier -- Directeur Technique de Clarisys Informatique -- Chef de projet logiciels libres / open-source ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [SQL] Variable column names in PL/pgSQL RECORD referencces
"Ken Winter" <[EMAIL PROTECTED]> writes: > In PL/pgSQL, is there a way to put a *variable* column-name in a dot > notation reference to a RECORD column? No. Some of the other, less-strongly-typed PLs can do it. regards, tom lane ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
[SQL] Variable column names in PL/pgSQL RECORD referencces
(Sorry for the redundancy – I sent this query earlier but forgot to put a title on it. Seems like it would be more useful with a title, so here it is again. If there’s a moderator who can delete my earlier message, please do so.) In PL/pgSQL, is there a way to put a *variable* column-name in a dot notation reference to a RECORD column? For example, suppose I want to write a function like the following, which is to be called by a "BEFORE INSERT" trigger: CREATE OR REPLACE FUNCTION foo ( ) RETURNS TRIGGER AS ' DECLARE var VARCHAR; BEGIN var := TG_ARGV[0] NEW. := ''whatever''; RETURN NEW; END; ' LANGUAGE 'plpgsql' ; The aim of this uninteresting function is to assign the value 'whatever' to the table column that is passed in by the calling trigger as TG_ARGV[0], i.e. the first calling argument. What I don't know is what to put into the dot notation in place of "." so that the column of NEW that is addressed by the assignment statement is the one passed in as the first argument. Is there any PL/pgSQL construct that could be substituted in here to achieve this result? If not, can anybody suggest a way to write a trigger-called function that would accomplish the same result? In case it's not obvious, the underlying goal is to write a single trigger-called function that could modify different columns for each trigger that called it, where each trigger specified the target column by a calling argument (or by any other viable mechanism). ~ TIA ~ Ken
[SQL] LISTEN/NOTIFY
Hi all, I just saw in the documentation the LISTEN/NOTIFY commands but i don't understand how i can use them. Can someone show me an example in PLPGSQL that use this system ? => A process send a NOTIFY command and a LISTEN process execute his own commands. Hope this clear, thanks Steff ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
Re: [SQL] LISTEN/NOTIFY
Forget about this post, i hadn't well understand what i can do with this system, now i find an example in the 8.0 doc with libpq that show me how it works Sorry THX Steff ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [SQL] Updatable views: any decent front-ends?
Bath, David wrote on 24.11.2005 23:57: While I can happily create rules on views to allow inserts, updates and deletes, I can't find a GUI front-end that understands that the view allows record edits that I can run on linux (whether through X or web-based doesn't matter) and simply open the relation and edit data without designing horrible forms with lots of code. I note that MS-Access allows this, as it asks for the field(s) that are unique and can be used for updating when you "attach" a table, but I don't have (or want) a Windows box or MS-Office. So 1) Does anybody know of a tool that allows easy editing of data in views? You might want to try my SQL Workbench: http://www.sql-workbench.net It will not auto-detect the key columns for updating the view, but it will allow you to select them manually if needed (for update/delete). Maybe I'll add automatic detection of the keys in the near future (if I find the time) It is written in Java (Swing) and thus should (and does) work on Linux. Whether it qualifies as "decent" is up to you :) Thomas ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
Re: [SQL] does indexes need statistics?
On Thu, Nov 24, 2005 at 07:43:28PM +0100, Mauricio Fernandez A. wrote: > Is it necesary the statistics be enabled when I create indexes or to > use them? Uh, yes, but you can't turn them off. I suspect I don't understand your question. Do you mean the "runtime statistics" section of the configuration file? If that's what you mean, then no. Those aren't the same thing as the statistical data used by the planner; the latter is updated when you run "analyse". A -- Andrew Sullivan | [EMAIL PROTECTED] "The year's penultimate month" is not in truth a good way of saying November. --H.W. Fowler ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
