datediff in postgresql

Mysql|oracle This is my comparison's installing and getting started with Oracle 10g, PostgreSQL 8 and MySQL 5. This is what I consider the comparison of the ' art for three categories to db:commercial vs. Academe vs. Internet Model. This is a comparison from the view of a new user wanting to install a database to learn. I ' m trying to keep the viewpoint of a home or small business user.Full disclosure:i am strongly biased towards Oracle and fully exp

Now, when talking about free databases, most people may first think of MySQL. Indeed, MySQL has been applied in many domestic fields, especially in website setup. However, PostgreSQL is actually the most powerful, rich, and complex free database. Many of its features are the predecessor of many commercial databases such as Oracle and DB2. As a matter of fact, I recently came into contact with PostgreSQL be

Document directory Use PostgreSQL database for PHP Development Use PostgreSQL database for PHP Development Author:Heiyeshuwu Use PostgreSQL database for PHP Development Note: The following content is more about how to install the environment. There is almost no actual development content. You can consider whether to read this article.

According to my knowledge, three of the four domestic databases are developed based on PostgreSQL. In addition, because of the flexible license, anyone can use, modify, and distribute PostgreSQL for free for any purpose, whether it is private, commercial, or academic research. This article only briefly introduces the installation and simple use of postgresql, and

The target of PostgreSQL is very similar to that of the current MySQL database. So what are the advantages of PostgreSQL? This article will be explained to you. This article introduces the basic concepts of PostgreSQL's transaction processing function, and explains how to execute various transactions through the PostgreSQL client and from the PHP script. Through

In this article, we use the MySQL 4.0.2-alpha to compare with PostgreSQL 7.2, because the MySQL 4.0.2-alpha begins to support the concept of the transaction, so this comparison is more advantageous for MySQL. We don't want to be just a performance test report, because at least from my point of view, stability and speed do not represent everything for a database. For a mature database, stability is certainly increasingly available. With the rapid impro

Tags: Java c language database triggers andI. Introduction of PostgreSQL1. What is PostgreSQLThe PostgreSQL database is the most powerful open source database available, supporting rich data types such as JSON jsonb type, array type, and custom types. And it provides a rich interface that can easily extend its functionality, such as the ability to implement its own index type in the gist framework, and it also supports writing custom functions, trigge

Source: amutu. comblog201306hive-metastore-db-postgresqlHIVE metadata uses derby as the storage DB by default, derby as the lightweight DB, it is more convenient to use in the development and testing process, but in the actual production environment, ease of use, Disaster Tolerance, stability, and various monitoring and Operation Source of this article: http://amutu.com/blog/2013/06/hive-metastore-db-postgresql/ HIVE metadata uses derby as the storage

Rails comes with a zero-configuration sqlite by default. This feature is OK for development, but cannot be written concurrently. It is not suitable for production. Let's start from scratch. P.S.: deploy postgresql Based on ubuntu server ================ Install postgresql and start it ====================== First install postgresql in ubuntu sudo apt-get instal

Implement PostgreSQL failover in CentOS 6.5 Pgpool-II is an intermediate component that works between the PostgreSQL multi-server and the PostgreSQL Data Warehouse client. It provides the following functions: Connection Pool: pgpool-II is used to save and connect to the PostgreSQL server and reuse new connections with

0, password file: Before giving other PostgreSQL client commands, we need to introduce the password file in PostgreSQL. The file is explained here in advance because we are applying the file in a lot of the following sample code to ensure that our scripts are automated. In other words, if the file is not supplied when the client command executes, all client commands for