pg_class(系统表:对象)是一个对象表,表的每个字段都是‘rel’开头,分明就是 ‘relation’这个单词的缩写,意思就是‘关系’。表中relkind字段决定对象类型:r = 普通表,i = 索引,S = 序列,v = 视图, c = 复合类型,s = 特殊,t = TOAST表。对象所属的relnamespace(模式名称)和relowner(所有者)都是用...
FROM pg_catalog.pg_type t LEFT JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace WHERE ( t.typrelid = 0 OR ( SELECT c.relkind = 'c' FROM pg_catalog.pg_class c WHERE c.oid = t.typrelid ) ) AND NOT EXISTS ( SELECT 1 FROM pg_catalog.pg_type el WHERE el.oid = ...
--r =普通表, i =索引,S =序列,v =视图,m =物化视图, c =复合类型,t = TOAST表,f =外部表 select * from pg_class where relkind='S' 1. 2. 3. 2、查找Sequence中的值 SELECT nextval(‘seq_commodity’); 这里nextval表示下一个值 3、查看表中的 序列 david=# \d tbl_xulie Table "pub...
SELECT clock_timestamp(), pg_class.relname, pg_locks.locktype, pg_locks.database, pg_locks.relation, pg_locks.page, pg_locks.tuple, pg_locks.virtualtransaction, pg_locks.pid, pg_locks.mode, pg_locks.granted FROM pg_locks JOIN pg_class ON pg_locks.relation = pg_class.oid WHERE relnam...
select*frompg_classwhererelkind='S' --新建序列 CREATE SEQUENCE"public"."district2_gid_seq"INCREMENT1MINVALUE1MAXVALUE2147483647START1CACHE1; 最后编辑于:2020.04.21 17:22:14 ©著作权归作者所有,转载或内容合作请联系作者 Geoserver/Openlayers ...
1#PostgreSQL 系统表23pg_class表记录了数据库中的表、索引、视图之间的关系4#一些字段:5#relname 表,索引,视图等的名字。6#relnamespace 包含这个关系的名字空间(模式)的 OID,对应pg_namespace.oid7#relkind r = 普通表,i = 索引,S = 序列,v = 视图, c = 复合类型,s = 特殊,t = TOAST表8910pg_...
postgres=# select oid, relname, relfilenode,reltablespace from pg_class where relfilenode = 0 and relkind = 'r' order by reltablespace; oid | relname | relfilenode | reltablespace ---+---+---+--- 1247 | pg_type | 0 | 0 1255 | pg_proc | 0 | 0 1249 | pg...
PG_CLASS系统表会保存两个统计信息:relpages和reltuples。relpages记录了当前表用了多少个页面,reltuples记录了当前表共有多少条元组。PG_STATISTIC系统表保存单列的统计信息,如果用户要给某个表生成统计信息,则可以使用ANALYZE语句对一个表进行统计分析,这样就能给这个表生成统计信息并且保存在PG_STATISTIC系统表中。
pg_catalog.pg_get_userbyid(c.relowner) as "Owner" FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace LEFT JOIN pg_catalog.pg_am am ON am.oid = c.relam WHERE c.relkind IN ('r','p','v','m','S','f','') ...
= ('pg_class'::regclass)::oid) AND (c.relkind = 'r'::"char") AND (s.relkind = 'S...