PostgreSQL

Get system Time function Select Now (); --2013-11-28 16:20:25.259715+08 Select Current_timestamp; --2013-11-28 16:20:38.815466+08 Select current_date; --2013-11-28 Select Current_time; --16:21:08.981171+08 Calculation

PostgreSQL 9.4 is loading a new feature called JSONB, a new type of data that can store JSON data that supports gin indexes. In other words, this feature, in the upcoming update, most importantly, if this is not important, then put Postgres in the

Build a mybatis+postgresql platform from the beginning Recently, there is a project database using PostgreSQL, using the original ecological mybatis operation data, the original ecological Nothing bad, But there is a tk.mybatis tool in the

In this article, we use the MySQL 4.0.2-alpha and PostgreSQL 7.2 to compare, because MySQL 4.0.2-alpha started to support the concept of transactions, so this comparison for MySQL should be more advantageous. We don't want to be just a performance

A PostgreSQL database cluster contains one or more named databases. Users and user groups are shared across the cluster, but other data is not shared. Any client connected to the server can only access the database declared in the connection request.

The data type specifies what type of data to store in the table field. When you create a table, you must use the data type for each column.There are three main types of data types in Potgresql. In addition, users can CREATE TYPE create their own

A. Description:To make the database read-only, PostgreSQL does not have a strictly read-only mode (such as temporary tables that are available in read-only transactions). You can set the session or the current transaction for subsequent logons to

Database version:PostgreSQL 9.6.3System version:CentOS Release 6.6 (Final)Download software (Download software):[email protected] tools]# wget https://ftp.postgresql.org/pub/source/v9.6.3/postgresql-9.6.3.tar.gzTo see if it is already installed

Node Ip Role Master 10.10.100.1 Master Standby1 10.10.100.2 Standby1 Standby2 10.10.100.3 Standby2 The user that is required to create the stream

The server doesn ' t grant access to the Database:the server reportsFatal:no pg_hba.conf entry for host ' 192.168.0.123 ', user ' postgres ', database ' Postgres ' fatal:no pg_hba.conf entry for Host "192.168.0.123", User "Postgres", Database

Ubuntu Install, use PostgreSQL database$ sudo apt-get install PostgreSQL$ sudo passwd postgres (postgres account's home directory:/var/lib/postgresql)Installing the Postgres Graphical client$ sudo apt-get install pgadmin3 (call to enter pgadmin3

1. BackgroundBefore the end of the day, the database has a temporary table cert_display_tmp used to do the interface display, the table data is from T_cert_sample, Ying said the data is incorrect, and then manually perform the update function,

EF's code first is a powerful and useful feature that allows you to write code and finally build a database based on your code, very well in line with the requirements of OO design, regardless of the database level (of course not completely

Over the past decade, many developers and professionals have compared MySQL with PostgreSQL, most of whom consider the latter to be more superior in performance. The supporters of PostgreSQL argue that its standard support and acid[1] are more than

1. Download PostgreSQL (open source database, recommended by GIS Industry) here (https://www.bigsql.org/postgresql/installers.jsp/);2. Download the PostGIS (PostgreSQL database GIS spatial database plugin) corresponding to PostgreSQL version (http://

Problem SQLScwksmlcls.wk_cls_c, scwklrgcls.wk_lrg_cls_nm, scwkmdlcls.wk_mdl_cls_nm, scwksmlcls.wk_sml_cls_nm, SCWKSMLCLS.WK_CLS_RMKFromScreqrsnswsINNER JOIN ScwkclsreqrsnswsOn scwkclsreqrsnsws.req_rsn_id = screqrsnsws.req_rsn_idINNER JOIN

PostgreSQL provides a powerful regular expression system that enables fuzzy queries at the database level.Regular expression matching operators: operator Description Example ~ Match regular

One way to do a backup of the PostgreSQL database according to the official manual is to use "SQL Dump" (another way is to directly back up files in the file system, refer to the official manual).The basic usage is as follows:Pg_dump dbname >

If you compile the database with Gmake world and Gmake Install-world, all the plugins will be installed, then you will not need to install them again.Plugin DirectoryContribGo to the plug-in directory you want to install, such asCD

English version of the website address: http://www.postgresql.org/The latest version information shown above is PostgreSQL 9.4.1, 9.3.6, 9.2.10, 9.1.15 & 9.0.19 released! Chinese Community address: http://www.postgres.cn/home display2014/12/18: The