In this query, we use a condition in the WHERE clause to exclude the system tables. If you omit the WHERE clause, you will get many tables including the system ones. Summary Use the \dt or \dt+ command in psql to show tables in a specific database. Use the SELECT statement to query...
2、通过SQL语句查询 "select * from pg_tables" —— 得到当前db中所有表的信息(这里pg_tables是系统视图) "select tablename from pg_tables where schemaname='public'" —— 得到所有用户自定义表的名字(这里"tablename"字段是表的名字,"schemaname"是schema的名字。用户自定义的表,如果未经特殊处理,默认都...
查询活动会话 set active_session 'select pid,usename,datname,query,client_addr from pg_stat_activity \ where pid <> pg_backend_pid () and state=\'active\' order by query;' 使用:active_session 查看会话等待事件 \set wait_event 'select pid,usename,datname,query,client_addr,wait_event_type...
PostgreSQL 语法 默认情况下 PostgreSQL 安装完成后,自带了一个命令行工具 SQL Shell(psql)。 Linux 系统可以直接切换到 postgres 用户来开启命令行工具: # sudo -i -u postgres Windows 系统一般在它的安装目录下: Program Files → PostgreSQL 11.3 → SQL Shell(
\showtables显示以下信息: name:引用表时所依据的名称。 datasetId:存储的数据集的ID。 数据集:所存储的数据集的名称。 描述:数据集的描述。 resolved:一个布尔值,它表明数据集在当前会话中是否已解析。 \timing将显示在打开和关闭之间切换。 显示以毫秒为单位。 超过一秒的间隔以分钟:秒格式显示,并在需要时添加...
Buffer \e [FILE] [LINE] edit the query buffer (or file) with external editor \ef [FUNCNAME [LINE]] edit function definition with external editor...Informational (options: S = show system objects, + = additional detail) \d[S+] list tables, views, and sequences \d[...
GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO username; 6)授予public模式中所有序列的所有权限给用户: GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO username; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. ...
the trigger's function to perform the necessary modifications to the underlying base tables and, where appropriate, return the modified row as it will appear in the view.Triggers on views can also be defined to execute once per SQL statement, before or after INSERT, UPDATE, or DELETE ...
PostgreSQL是一种开源的关系型数据库管理系统(RDBMS),它支持高级SQL查询语言和广泛的功能。在云计算领域中,PostgreSQL被广泛应用于构建可扩展和高性能的应用程序。 物化视图是一...
postgres=# \set ECHO_HIDDEN on postgres=# \dt *** QUERY *** SELECT n.nspname as "Schema", c.relname as "Name", CASE c.relkind WHEN 'r' THEN 'table' WHEN 'v' THEN 'view' WHEN 'm' THEN 'materialized view' WHEN 'i' THEN 'index' WHEN 'S' THEN 'sequence' WHEN 's' ...