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...
db_tapp=# SELECT * , pg_relation_filepath(oid) FROM pg_class where pg_relation_filepath(oid) like '%8843923%'; oid | relname | relnamespace | reltype | reloftype | relowner | relam | relfilenode | reltablespace | relpages | reltuples | relallvisible | reltoastrelid | relhasi...
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(*...
selectreltuplesfrompg_classwhereoid='test_table'::regclass;
pg_class.reltype as reltype from pg_attribute ,pg_class,pg_namespace where pg_attribute.attrelid = pg_class.oid and pg_namespace.oid = pg_class.relnamespace and pg_attribute.attnum > 0 and pg_class.relkind = 'r' and pg_namespace.nspname = 'public') as a -- 引号更改成自己的...
from pg_class where oid = 'public.DOGGY'::regclass) * random() )) order by tag asc limit(1); So what does this query do? In our case, the above query estimates the row count with a random number multiplied by the ROW ESTIMATE, and the rows with a TAG value greater than the...
sql:select cast(relname as varchar) as Name, cast(obj_description(c.oid,'pg_class') as varchar) as Description from pg_class c inner join pg_namespace n on n.oid = c.relnamespace and nspname='public' inner join pg_tables z on z.tablename=c.relname where relkind in('p', ...
$SELECToid::regclass,relaclFROMpg_classWHERErelname='whatever'; oid │ relacl ──────────┼──────────────────────────────────────────────────────────── ...
Index Cond: ((parttype = 'p'::"char") AND (parentid = r.oid)) (10 rows) -- 从节点 zdhdb=# select count(*) as cnt from pg_partition p, pg_namespace n, pg_class r where p.parentid = r.oid and r.relnamespace = n.oid and r.relname = 'test_table' and n.nspname = ...
.,如何快速添加这么一个字段: 首先,在这里我们涉及三张系统表,pg_class(表属性)、pg_attribute(列属性)、pg_attrdef(缺省值信息),接下来依次看一下三张表的信息: #pg_class...:oid表系统序列号,relname表名,relnatts列个数(主要修改属性) postgres=#selectoid,relname,relnatts from pg_class where relnam...