PostgreSQL

First, configuration instructions:Role Name: User011.user01 Permission Description:Connect to test database, cannot connect to other database when unauthorized;In the specified schema, create \ View \ Delete The table to view the object in the

Website address: https://www.postgresql.org/installation files: http://www.enterprisedb.com/products-services-training/pgdownload#windowsFiles after download: Postgresql-9.6.0-beta3-windows-x64.exe (129M)Double-click Install:If the Stack Builder

The behavior of modifying data that is already stored in a database is called an update. You can update a single row, or you can update all the rows in the table, and you can update a subset of the rows. We can update each field independently, while

PostgreSQL implements part of the sql/med specification, allowing SQL queries that use rules to access data residing outside of PostgreSQL. Such data is referred to as external data . (Note that this usage cannot be confused with foreign keys, which

The basic idea here is to use Max, because the rest of the columns are null, so Max can finally get the value of this line.Common query:SELECT ICD, CaseWhen (Row_number () + (PARTITION by Inner_cd ORDER by Slide_seq))=1Then Slide_qty END

First, introduction:PG provides a new feature after the 9.* release, which is the read and write separation of stream replication, which is a typical application of PG high availability. This feature is called Active Dataguard in Oracle and is

Import commandpsql-d game-u postgres-f/root/plubic.sqlThe following error occurred:Psql:FATAL:Peer authentication failed for user "Postgres" The workaround for this subcommandRun the following command to edit the pg_hba.conf file because pg_hba.conf

PostgreSQL installationInstallationInstall with Yum (source http://yum.postgresql.org/)Yum Install https://download.postgresql.org/pub/repos/yum/9.5/redhat/rhel-7-x86_64/pgdg-centos95-9.5-2.noarch.rpmYum Install Postgresql95-server

PostgreSQL version number: Psql (9.3.4)1. Add a row of ALTER TABLE table_name ADD COLUMN_NAME datatype; 2. Delete a list of ALTER TABLE table_name drop column_name; 3. Change the data type of the

CREATE TABLE Products (Product_no Integer,Name text,Price numeric CONSTRAINT positive_price CHECK (Price > 0));CHECK returns a bool value.Foreign key referential integrity, referential integrityA FOREIGN KEY constraint specifies that the values in a

1.pgdg-centos96-9.6-3.noarch.rpmPostgreSQL 9.6--"CentOS 7-x86_64Download Link:https://yum.postgresql.org/repopackages.phpRPM-IVH pgdg-centos96-9.6-3.noarch.rpm2.postgresql96-server# yum Install-y postgresql96-server# yum Install-y

1, ExplainExplain select * FROM TableName;2. Explain output JOSN formatExplain (format JSON) SELECT * FROM TableName;In addition to the JSON format, XML, text, Yaml, and more are supported3. Explain analyze view actual start-up timeExplain analyze

On the understanding, I see a question like this: MySQL Query select * FROM table where ID in (hundreds of or thousands of IDs) how to improve efficiency? Modify the e-commerce website, a product attribute table, hundreds of thousands of

Create TableK_user (op_idVARCHAR( $) not NULL, Op_nameVARCHAR( -) not NULL, PasswordVARCHAR( -) not NULL, Real_nameVARCHAR( -) not NULL, Lock_markVARCHAR( -) not NULL, Dept_noTEXT NULL, post_idTEXT NULL, TelVARCHAR( -)

#include #include int main () { int lib_ver = Pqlibversion (); printf ("Version of LIBPQ:%d\n", lib_ver); return 0;}All:gcc-o ex_02.exe ex_02.c-i "D:/program files/postgresql/9.5/include"- L "D:/program Files/PostgreSQL/9.5/lib"

MySQL convert PostgreSQL1) Time format conversion from_unixtime (timestamp, '%y-%m-%d ') = = "SELECT To_char (To_timestamp (t.create_time/1000), ' Yyyy-mm-dd HH24:MI:SS ')2) field stitching Group_concat (Restaurantid, ' | ', cityid) = = "Select

Today, install the PostgreSQL database under centos6.5, and now tidy up your own procedures.I. Installation of postgresql9.4 under Centos6.51.1. Display all the relevant PostgreSQL installation packagesYum List postgres*1.2. Install the databaseYum

Pgsql partition Table:--Main Table CREATE TABLE test (ID integer, name varchar); CREATE index idx_test_id on test using btree (ID);--Table Create Table Test_b (like test including constraints including defaults including indexes) inherits (test);

This article is reproduced from http://blog.chinaunix.net/uid-22920230-id-3493064.htmlCreate a databaseCREATE DATABASE Test with OWNER = postgres ENCODING = ' UTF8 ';Enter the console method to execute the command under the installation purpose bin

1. Install postgresqlYum-y install postgresql-server postgresql-develMkdir/work/pgdataUseradd postgres-d/work/pgdataChown postgres. postgres-R/work/pgdataSu-postgresVim ~ /. Add the following content to bash_profile:Export PGHOME =/work/pgdataExport