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postgresql change table

--if cloumn exist SELECT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema='ent' AND table_name='AdsPlatform' AND column_name='Name'); --add cloumn ALTER TABLE finance."MappingInfo" ADD COLUMN IF NOT EXISTS "Active" b…

PostgreSQL获取table名，字段名

PostgreSQL获取数据库中所有table名: SELECT tablename FROM pg_tables WHERE tablename NOT LIKE 'pg%' AND tablename NOT LIKE 'sql_%' ORDER BY tablename; PostgreSQL获取数据库中所有table名及table的注解信息: SELECT tablename, obj_description(relfilenode, 'pg_class') FROM pg_tables…

PostgreSQL truncate table会释放索引的空间

apple=# create table test(id integer, info text); CREATE TABLE apple=# insert into test select generate_series(1, 100000), md5('test'); INSERT 0 100000 apple=# select * from test limit 1; id | info ----+---------------------------------- 1 | 098f6bcd…

PostgreSQL ALTER TABLE中改变数据类型时USING的用法<转>

在修改表字段类型的时候使用Using来进行显示的转换类型. 原文说明: SET DATA TYPE  This form changes the type of a column of a table. Indexes and simple table constraints involving the column willbe automatically converted to use the new column type by reparsing the originally supp…

POSTGRESQL NO TABLE

POSTGRESQL EXTENDING SQL GRIGGER PROCEDURAL…

postgresql vacuum table

2down vote according to Documentation VACUUM reclaims storage occupied by dead tuples. But according to this post Dead rows are deleted rows that will later be reused for new rows from INSERTs or UPDATEs. Some dead rows (or reserved free space) can b…

centos7 pgpool+postgresql

安装postgresql CentOS7安装并配置PostgreSQL 安装pgpool rpm -ivh http://www.pgpool.net/yum/rpms/3.7/redhat/rhel-7-x86_64/pgpool-II-release-3.7-1.noarch.rpm yum -y install pgpool-II-pg95 yum -y install pgpool-II-pg95-debuginfo yum -y install pgpool-II-pg95-devel…

How to speed up insertion performance in PostgreSQL

Disable any triggers on the table Drop indexes before starting the import, re-create them afterwards. (It takes much less time to build an index in one pass than it does to add the same data to it progressively, and the resulting index is much more c…

PostgreSQL的HA解决方案-2负载均衡（load balance）

一.部署说明 1.1 实施环境 本文档实验环境如下: PGSQL主机: 192.168.1.45 PGSQL备机: 192.168.1.50 软件和系统版本 Pgsql 版本: pgsql 9.2.4 Linux 版本: Redhat 5.8 pgpool版本:pgpool-II version 3.3.4 (tokakiboshi) 1.2 文档说明 在postgresql 的stream replication配置一文我们实现了postgresql的stream replication,实现…

借助JavaScript中的时间函数改变Html中Table边框的颜色

借助JavaScript中的时间函数改变Html中Table边框的颜色 <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>霓虹灯效果的边框</title> <script language="javascript"> var i=0; var Co…