Installing PostgreSQL extensions manually; A typical migration failure scenario. Managing PostgreSQL extensions. This guide documents how to manage PostgreSQL extensions for installations with an external PostgreSQL database.
Apr 10, 2020 · The remote database might be another database on the same PostgreSQL instance, or a database half way around the world, it doesn't matter. postgres_fdw is built-in to PostgreSQL 9.3 and includes read/write support; a read-only version for 9.2 can be compiled and installed as a contrib module.
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#!/bin/bash # Original script by # # Copyright (c) 2005 Aaron Axelsen

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  • First I want to check if user exist, so I tried. sudo -u postgres psql -c 'SELECT 1 FROM pg_roles WHERE rolename=${VAR_USER}'. If using something other than the default database, make sure to specify that database name somewhere/somehow in the script.
  • SQL Check if table exists Check if table exists. Before creating a new table or before dropping a table you need to check if table exists in the database. To check if table exists in a database you need to use a Select statement on the information schema TABLES or you can use the metadata function OBJECT_ID().

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Mar 08, 2011 · Simple procedure to install PostgreSQL (stable: 8.4) on Ubuntu Linux (tested on 8.04 LTS, 10.04 LTS, 11.04) : 1/ Install the DBMS : $ sudo apt-get install postgresql postgresql-contrib (the postgresql-contrib is optional, it's just some additional facilities for Postgres) 2/ Install the GUI client (pgadmin or pg-client) to manage : $ sudo apt-get…

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  • Oracle / PLSQL: EXISTS Condition. This Oracle tutorial explains how to use the Oracle EXISTS condition with syntax and examples. The Oracle EXISTS condition is used in combination with a subquery and is considered "to be met" if the subquery returns at least one row. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
  • It used to be that the EXISTS logical operator was faster than IN when comparing datasets using a subquery.For example, in cases where the query had to perform a certain task, but only if the ...

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If there are rows in SecondTable, then do the second EXISTS: SELECT * FROM FirstTable WHERE RowProcessed = 'N' AND (NOT EXISTS (SELECT 1 from SecondTable) OR EXISTS (SELECT 1 FROM SecondTable WHERE FirstTable.Key = SecondTable.Key and SecondTable.RowProcessed = 'Y')) AND OtherConditions ...

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Jul 25, 2008 · PostgreSQL: The world's most advanced open source database Discussion. Friday, July 25, 2008 [GENERAL] I often have to do "update if exist, else insert", is my database design wrong?

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Dec 30, 2019 · MongoDB, for example, is a document database, and MySQL is a relational database. Some relational databases allow JSON support, like PostgreSQL, but you often needed to make a decision on whether to use a document database or a relational database. With PostgreSQL, you have the option of both.

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Pervasive PSQL supports stand-alone, client-server, peer-to-peer and software-as-a-service (SaaS) architecture. The central architecture of Pervasive PSQL consists of two database engines: (1) the storage engine, known as MicroKernel Database Engine (MKDE) and described by Pervasive Software as a transactional database engine and (2) the relational database engine, known as SQL Relational ...

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Relational and object-relational databases are the market-dominant databases. Relational databases are based on the concept of relation, and have a very robust mathematical model. Object-relational databases such as PostgreSQL overcome the limitations of relational databases by introducing complex data types, inheritance, and rich extensions.

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1.Launch POSTGRESQL command prompt 2.Enter the following at the command prompt. C:\Program Files\PostgreSQL\8.1\bin>psql -U postgres -h localhost. 3.Provide superuser “postgres” password 4.-U postgres – indicates user name, -h localhost – indicates server is on local host 5.PostGRESQL prompt will appear – means that we are connected to the database named “postgres”, the default database.

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