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• I don't find the sql request

  - by user301089

  Hi everybody, Here it's my problem I've a list of the following measure : src1 dst2 24th december 2009 src1 dst3 22th december 2009 src1 dst2 18th december 2009 I would like to have just the latest measures with a sql request - 2 first lines in my case because the pairs(src and dst) aren't the same. I try to use DISTINCT but I…

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• Table with a lot of attributes

  - by Robert

  Hi, I'm planing to build some database project. One of the tables have a lot of attributes. My question is: What is better, to divide the the class into 2 separate tables or put all of them into one table. below is an example create table User { id, name, surname,... show_name, show_photos, ...) or create table User { id, name, surname,...…

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• Postgres: Issue Creating a User

  - by Grasper

  I have a database called ADB. When I create a new user/role, that user cannot, by default SEE ADB and query against the tables in it. How can I change that default?

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• Foreign/accented characters in sql query

  - by FromCanada

  I'm using Java and Spring's JdbcTemplate class to build an SQL query in Java that queries a Postgres database. However, I'm having trouble executing queries that contain foreign/accented characters. For example the (trimmed) code: JdbcTemplate select = new JdbcTemplate( postgresDatabase ); String query = "SELECT id FROM province WHERE name…

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• Possible to rank partial matches in Postgres full text search?

  - by Joe

  I'm trying to calculate a ts_rank for a full-text match where some of the terms in the query may not be in the ts_vector against which it is being matched. I would like the rank to be higher in a match where more words match. Seems pretty simple? Because not all of the terms have to match, I have to | the operands, to give a query such as…

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• postgres counting one record twice if it meets certain criteria

  - by Dashiell0415

  I thought that the query below would naturally do what I explain, but apparently not... My table looks like this: id | name | g | partner | g2 1 | John | M | Sam | M 2 | Devon | M | Mike | M 3 | Kurt | M | Susan | F 4 | Stacy | F | Bob | M 5 | Rosa | F | Rita | F I'm trying to get the id where either the g or g2 value equals 'M'...…

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• Ruby on rails active-record generated SQL on Postgres

  - by jpartogi

  Dear all, Why does Ruby on rails generated more queries in the background on Postgres than MySQL? I haven't tried deploying Rails on production with Postgres yet, but I am just afraid this generated queries would affect the performance. Do you find Rails with Postgres is slower than MySQL, knowing that it produce more query on the…

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• Restart of Master Postgres DB with unconsumed Wal files

  - by Douglas Sellers

  We have a situation where walmanager is being used to ship wal files between a master and a slave Postgres database. The slave machine has failed and has had to have been rebuilt. This has caused a lot of unconsumed wal files to build up on the master. If a reboot is issued to the Postgres master, and there are 24 hours worth…

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• Can I install postgresql8.2 via command prompt or running any batch or registry file?

  - by Supereme

  Hi, Is it possible to install the entire database(postgresql8.2) via command prompt or batch file or registry file bypassing the trivial procedure for installation. But then to a question comes that, how can we supply default parameters such as name,password,language,default location of database? Currently I'm working on 'Windows…

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• Fast find near users using PostGIS

  - by opedge

  I have 5 tables: - users - information about user with current location_id (fk to geo_location_data) - geo_location_data - information about location, with PostGIS geography(POINT, 4326) column - user_friends - relationships between users. I want to find near friends for current user, but it takes a lot of time of executing select…

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• Postgres: clear entire database before re-creating / re-populating from bash script

  - by Hoff

  hi folks, I'm writing a shell script (will become a cronjob) that will: 1: dump my production database 2: import the dump into my development database Between step 1 and 2, I need to clear the development database (drop all tables?). How is this best accomplished from a shell script? So far, it looks like this: #!/bin/bash…

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• Lazarus Pascal - DB Connection - clarification

  - by itsols

  The following code is from the docs here: Program ConnectDB var AConnection : TSQLConnection; Procedure CreateConnection; begin AConnection := TIBConnection.Create(nil); AConnection.Hostname := 'localhost'; AConnection.DatabaseName := '/opt/firebird/examples/employee.fdb'; AConnection.UserName := 'sysdba'; …

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• INSERT and transaction serialization in PostreSQL

  - by Alexander

  I have a question. Transaction isolation level is set to serializable. When the one user opens a transaction and INSERTs or UPDATEs data in "table1" and then another user opens a transaction and tries to INSERT data to the same table, does the second user need to wait 'til the first user commits the transaction?

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• Database query optimization

  - by hdx

  Ok my Giant friends once again I seek a little space in your shoulders :P Here is the issue, I have a python script that is fixing some database issues but it is taking way too long, the main update statement is this: cursor.execute("UPDATE jiveuser SET username = '%s' WHERE userid = %d" % (newName,userId)) That…

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• Optimum size of transaction in Postgres?

  - by Joe

  I'm running a process that does a lot of updates ( 100,000) to a table. I have the choice between putting all the updates in a single transaction or committing transactions every 1000 or so. Ignore for the moment the case where a transaction fails and is aborted. I'm interested in the best size of transaction for…

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• SQL statement to split a table based on a join

  - by williamjones

  I have a primary table for Articles that is linked by a join table Info to a table Tags that has only a small number of entries. I want to split the Articles table, by either deleting rows or creating a new table with only the entries I want, based on the absence of a link to a certain tag. There are a few million…

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• Postgres: Convert varchar to text

  - by williamjones

  I screwed up and created a column as a varchar(255) where that is no longer sufficient. I've read that varchar has no performance benefits over text on Postgres, and so would like to convert the varchar to a text column in a safe way that preserves the data. What's the best way for me to do this?

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• postgres stored procedure problem

  - by easyrider

  Hi all, Ich have a problem in postgres function: CREATE OR REPLACE FUNCTION getVar(id bigint) RETURNS TABLE (repoid bigint, suf VARCHAR, nam VARCHAR) AS $$ declare rec record; BEGIN FOR rec IN (WITH RECURSIVE children(repoobjectid,variant_of_object_fk,…

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• How can I execute a SQL query in emacs lisp?

  - by Chris R

  I want to execute an SQL query and get its result in elisp: (let ((results (do-sql-query "SELECT * FROM a_table"))) (do-something-with results)) I'm using Postgres, and I already know all of my connection information (host, username, password, db et al) I just want to execute the query and get the result…

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• Funny characters in my db

  - by hdx

  My web app is breaking when I try edit a certain content type and I'm pretty sure it is because of some weird characters in my database. So when I do: SELECT body FROM message WHERE id = 666 it returns: <p>⢠<span></span></p><p><br…

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• What is the best Django syncdb crash debugging technique ?

  - by user367752

  What is the best Django syncdb crash debugging technique ? I've previously asked a question about a problem with manage.py syncdb returning an exception and the answer was that the app has a wrong import. …

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• named_scope + average is causing the table to be specified more then once in the sql query run on po

  - by hadees

  I have a named scopes like so... named_scope :gender, lambda { |gender| { :joins => {:survey_session => :profile }, :conditions => { :survey_sessions => { :profiles => { :gender =>…

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• postgres store with composite value type, or a better way of attributing an inverted index

  - by Hassan Syed

  can't seem to figure out the syntax for populating a hstore with a value of composite type -- note: I do not want to convert a record to a hstore. select hstore('hello => ROW(1,2)'); I know it's…

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• ROR heroku PostGres issue

  - by oelbrenner

  getting error: ActiveRecord::StatementInvalid (PGError: ERROR: argument of HAVING must be type boolean, not type timestamp without time zone controller code snippet: def inactive @number_days =…

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• How to optimize this SQL query for a rectangular region?

  - by Andrew B.

  I'm trying to optimize the following query, but it's not clear to me what index or indexes would be best. I'm storing tiles in a two-dimensional plane and querying for rectangular regions of that…

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