Select components 选择需要安装的服务: PostgreSQL Server:数据库(DBMS)服务,必选项。 pgAdmin 4:客户端管理工具,建议勾选。 Stack Builder:依据需求选择。 Command Line Tools:命令行工具,交互必选项。 2.4 安装步骤04 Data Directory 设置数据库实例化数据存放目录。类似于MySQ初始化生成data目录。 2.5 安装步骤05 ...
postgres=# \c flywaytestpsql (15.0 (Ubuntu 15.0-1.pgdg20.04+1), server 15.1 (Debian 15.1-1.pgdg110+1))You are now connected to database "flywaytest" as user "postgres".flywaytest=#请注意，默认psql提示显示当前连接的数据库名称。2、列出所有数据库 \l命令将列出当前服务器中的所有数...
This will log you into the PostgreSQL prompt, and from here you are free to interact with the database management system right away. Exit out of the PostgreSQL prompt by typing: \q This will bring you back to thepostgresLinux command prompt. ...
SELECTpg_reload_conf(); 这将使得修改后的参数立即生效。 通过命令行参数(command-line): 你可以通过启动 PostgreSQL 服务时传递命令行参数的方式修改某些配置参数。例如: postgres -c work_mem=64MB 这会使work_mem参数在启动时被设置为64MB。 使用ALTER DATABASE命令: 你还可以通过ALTER DATABASE命令在特定数据...
postgres@[local]:5432=#\c test pguserYou are now connected to database"test"as user"pguser".test@[local]:5432=#select current_database;ERROR: column"current_database"does not exist LINE 1: select current_database; ^test@[local]:5432=#select current_database();current_database ...
test=# create view emp_view as select empno,ename from emp;CREATE VIEWtest=# \sv emp_viewCREATE OR REPLACE VIEW public.emp_view ASSELECT emp.empno,emp.enameFROM emp 四, timing SQL语句执行计时 postgres=# \timing onTiming is on.postgres=# \timing offTiming is off. ...
select * from pg_database; postgres=# select * from pg_database; oid | datname | datdba | encoding | datcollate | datctype | datistemplate | datallowconn | datconnlimit | datlastsysoid | datfrozenxid | datminmxid | dattablespace | datacl ---+---+---+---+---+---+---...
select to_char(now(),'yyyy-mm-dd hh24:mi:ss') "巡检时间" ,line_number "line_number(行号)" ,type "type(连接类型)" ,database "database(数据库名)" ,user_name "user_name(用户名)" ,address "address(ip地址)" ,netmask "netmask(子网掩码)" ,auth_method "auth_method(认证方式)" from...
select datname from pg_database limit :a; select datname from pg_database limit :b; select datname from pg_database limit :c; select datname from pg_database limit :d; 以上为将变量带入查询中的一些简单的操作,而在POSTGRESQL 有一部分情况是通过将变量带入到函数中的,我们下面举一个例子来看...
You are now connected to database"postgres" as user "postgres". --显示当前的数据库: postgres=# select current_database(); current_database --- postgres (1 row) --该命令显示当前的userid: postgres=# select current_user; current_user --- postgres...