PostgreSQL

I. Any/someWHERE expression operator any (subquery)WHERE expression operator SOME (subquery)In fact, any and some are equally effective here, the result set of a subquery can only be a field, the left expression uses operator to perform a comparison

When a table is created, there is no data in it. The first thing to do before a database can be useful is to insert data into it. The data is conceptually inserted one line at a time. We can of course insert multiple rows at a time, but there is no

Insert is writing data to the table, each INSERT statement can write one piece of data, or it can write multiple data. You can also use additional query result sets in insert to write query results to a table.Test tableTest=createtableintvarchar(+));

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 INSERT statement is used to add rows to the table:INSERT into Weather VALUES (' San Francisco ', 46, 50, 0.25, ' 1994-11-27 ');Please note that all data types use a fairly straightforward input format. Constants that are not simple numeric

This chapter provides an overview of how to perform simple operations using SQL. The purpose of this tutorial is simply to give you an introduction, not a complete SQL tutorial. There are many books on SQL, including understanding the New SQL and A

Up Vote2down Votefavorite From the article, I tried to update or delete the property of a jsonb column:CREATE TABLE xxx (id bigserial, data jsonb);INSERT into XXX (data) VALUES (' {' A ': 1, ' B ': 2} ');SELECT * from data;ID | Data----+---------

Understanding the interrelationships between PostgreSQL components will make this section clearer.In terms of database terminology, PostgreSQL uses a client/server pattern. A PostgreSQL session consists of the following related processes (Programs):

http://timmurphy.org/tag/mysql/http://timmurphy.org/2009/11/17/use-schema_name-in-postgresql/====================================For those moving from MySQL to PostgreSQL, there is a few differences which you'll need to get used to. One of these

OriginIso=> \d+test; Table"public.test"Column| Type | Modifiers | Storage |Description--------+-----------------------+-----------+----------+-------------No| Character varying (32) | notnull | Extended |Name| Text | notnull | Extended

Create a function Create a trigger that binds tables and functions ?ALTER TRIGGER trigger_name on table_nameRENAME to new_name;?ALTER TRIGGER last_name_changes on EmployeesRENAME to log_last_name_changes;?ALTER TABLE table_nameDISABLE

1 Yum Install http://yum.postgresql.org/9.4/redhat/rhel-6-x86_64/pgdg-redhat94-9.4-1.noarch.rpm 2yuminstall postgresql94-server postgresql94-contrib3 /usr/ pgsql-9.4/bin/postgresql94-setup InitdbBoot up1 systemctl enable postgresql-9.4.

To create a table:CREATE TABLE Char(2PRIMARYKEYtextUNIQUE);Insert data:INSERT intocountries (Country_code,country_name)VALUES('US','states'),('MX','Mexico'),('au','Australia'),('GB','Kingdom'),('de','Gemany'),('ll','Loompaland');OrINSERT into

If you need to create a table with 99 columns, the column names are regular, such as S01,s02,s03 ... Perhaps you would think of the following statementCREATE TABLE tb_sxx (s01 varchar), S02 varchar (TEN), S03 varchar, ... s99 varchar (10));Is there

Reference: http://www.postgresql.org/docs/current/static/pgupgrade.html Overview There are several options to upgrade from a lower version to a new version. One is the use of Pg_dump/pg_restore, the method is more time-consuming, that

In the shell command line, when you use Postgresql-client to connect to the PostgreSQL database, you enter the password every time. If you want to write Shell Script, do some kind of backup-like automation management, each time you have to manually

??Add PostgreSQL apt repo. According to your distribution (Utopic, trusty, Jessie, wheezy and etc):??Deb HTTP://APT.POSTGRESQL.ORG/PUB/REPOS/APT/TRUSTY-PGDG main 9.5??Install PostgreSQL 9.5wget--quiet-o-HTTPS://WWW.POSTGRESQL.ORG/MEDIA/KEYS/ACCC4CF8.

postgres=# \h Create TablespaceCommand:create tablespaceDescription:define a new tablespaceSyntax:CREATE tablespace Tablespace_name[OWNER User_name]Location ' directory '[With (tablespace_option = value [, ...])]postgres=# Create tablespace tbs_data

This document records the installation, configuration, use, and operation of PostgreSQL on CentOS 6.7.First, the preparatory work1. CentOS 6.72. Network OKSecond, installationInstall PostgreSQL using YUM.Yum Install PostgreSQLThird, initializeAfter

First, you must specify--enable-nls= "language name" before compiling, otherwise there will be no multilanguage support, such as--enable-nls= "ZH_CN" Of course disabling the NLS can lead to a negligible performance boost When