DECLARE variable_col int := (SELECT oid FROM pg_class WHERE relname='tablename'); SELECT * FROM pg_class WHERE oid=variable_col; 手头没 pg 库,没执行,大概意思理解一下。 P.S. variable_col 是变量名,我瞎起的;int 记得改成你那个 oid 的数据类型。 有用1 回复 Ocean: 你这个declare的用法...
select pg_size_pretty(pg_total_relation_size('table_name')) as size; 5、查看表中索引大小 select pg_size_pretty(pg_indexes_size('product')); 6、获取各个表中的数据记录数 select relname as TABLE_NAME, reltuples as rowCounts from pg_class where relkind = 'r' order by rowCounts desc 7...
select * from student where name like E'%\'%' ●查看表记录总数 方式一: select relname as TABLE_NAME, reltuples as rowCounts from pg_class where relkind = 'r' and relnamespace = (select oid from pg_namespace where nspname='public') order by rowCounts desc; 方式二: select count(*...
FROM pg_class t LEFT JOIN pg_tablespace sp ON sp.oid = t.reltablespace where spcname is not null 3. Ran this on those objects not on data2 (the current default TS) alter index public.my_index set tablespace data2; 4. postgres=# ALTER DATABASE mydatabase SET TABLESPACE pg_default; ...
from (select pg_namespace.nspname as 数据库名, pg_class.relname as 表名, cast(obj_description(pg_class.relfilenode,'pg_class') as varchar) as 表中文描述, '' as 表类型, '' as 表创建时间, pg_attribute.attnum as 字段编号, pg_attribute.attname as 字段名, ...
其实一般是因为，一个项目只要维护时间足够长，后期加字段是极大概率事件。换句话说，select * 在你当时...
pgxc_class是一个系统表,用于存储表的分布相关信息。...这是数据库分布策略的核心元数据表之一,定义了每个表在集群中的分布方式和相关属性。...用于连接pg_class获取表名(relname)等信息。 pclocatortype,定义了表的分布策略 'H'(HASH):基于分布列的哈希值分布到不同的节点。...节点定位:结合nodeoids字...
SELECT retrieves data from a table or view.Serving as an overlaid filter for a database table, SELECT filters required data from the table using SQL keywords.The owner of
因此,执行完REVOKE SELECT ON table t1 FROM user3;之后,虽然user3用户没有了表t1的访问权限(通过系统表pg_class的relacl字段可查看t1表的权限),但是他仍然有public的权限,所以仍能访问该表。 处理方法 撤销public的权限后对user3用户的权限单独管控。但是由于REVOKE回public的权限后可能导致原来能访问该表的用户(...
execute( "select t.oid FROM pg_type t WHERE t.typname = 'hstore' and t.typisdefined" ) oid = cur.fetchone()[0] ext.register_type(ext.new_type((oid,), "HSTORE", ext.UNICODE)) except Exception: pass Example #5Source File: XAsyncSockets.py From MicroWebSrv2 with MIT License 6...