create database [数据库名]; 删除数据库 drop database [数据库名]; 重命名一个表 alter table [表名A] rename to [表名B]; 删除一个表 drop table [表名]; 在已有的表里添加字段 alter table [表名] add column [字段名] [类型]; 删除表中的字段 alter table [表
We’ve loaded a sample database in for you and you’re a superuser. Learn SQL Learn about the basics of SQL Joins in Postgres Learn about inner and outer joins in this tutorial Indexing (B-Tree Indexes) Learn how to create a b-tree index in Postgres. No yardwork required!
What are the Best Open Source Postgres Database Migration Tools? What Other Tools You Might Consider? What Makes These Postgres Database Migration Tools Different From Each Other? Conclusion FAQs 1. What is the best way to migrate a PostgreSQL database? 2. What steps should you take to migra...
[postgres@web1 ~]$ /data/pgsql/bin/createuser zhongwc -P Enter password for new role: Enter it again: [postgres@web1 ~]$ 使用createdb创建数据库 [postgres@web1 ~]$ /data/pgsql/bin/createdb --help createdb creates a PostgreSQL database. Usage: createdb [OPTION]... [DBNAME] [DESCRIPT...
CREATE DATABASE Y N N CREATE DATABASE LINK Y Y DDL CREATE DIRECTORY Y Y DDL CREATE DOMAIN Y Y DDL CREATE EVENT TRIGGER Y Y DDL CREATE EXTENSION Y Y DDL CREATE FOREIGN DATA WRAPPER Y Y DDL CREATE FOREIGN TABLE Y Y DDL CREATE FUNCTION Y Y DDL CREATE INDEX Y Y DML CREATE LANGUAGE ...
ORDER BY、DISTINCT 和归并连接都要用到排序操作。哈希连接、基于哈希的聚集以及基于哈希的IN 子查询处理中都要用到哈希表。 maintenance_work_mem = 2GB #指 定在维护性操作 ( 例如VACUUM、CREATE INDEX 和 ALTER TABLE ADD FOREIGN KEY)中使用的 最大的内存量。其默认值是 64 兆字节(64MB)。
has_database_privilege(user,database,privilege) 用户是否有访问数据库的权限 CREATE/TEMPORARY has_database_privilege(database,privilege) 当前用户是否有访问数据库的权限 CREATE/TEMPORARY has_function_privilege(user,function,privilege) 用户是否有访问函数的权限 EXECUTE has_function_privilege(function,privile...
Alternatively, you can use an existing Postgres user in your database. The following commands will create a new user: CREATE USER <user_name> PASSWORD 'your_password_here'; Now, provide this user with read-only access to relevant schemas and tables. Re-run this command for each schema you...
server_encoding Sets the server (database) character set encoding. 设置服务器(数据库)字符集编码。 server_version Shows the server version. 显示服务器版本。 server_version_num Shows the server version as an integer. 将服务器版本显示为整数。 session_replication_role Sets the session's behavior for...
To open the Create Server dialog box, select Object > Register > Server. Note You must ensure the pg_hba.conf file of the Postgres server that you're registering allows connections from the host of the PEM client before attempting to connect. Only database superusers or users with the ...