视图触发器的创建分类 :(INSTEAD OF) (INSERT | UPDATE | DELETE) (FOR EACH ROW) (WHEN NEW.? and,or OLD.? ... other boolean express ....)(before | after) (INSERT | UPDATE | DELETE) (FOR EACH STATEMENT) (WHEN BOOLEAN exp
此外,不支持行级别安全策略: perminfo=nsitem->p_perminfo;perminfo->requiredPerms=(is_from?ACL_INSERT:ACL_SELECT);tupDesc=RelationGetDescr(rel);attnums=CopyGetAttnums(tupDesc,rel,stmt->attlist);foreach(cur,attnums){intattno;Bitmapset**bms;attno=lfirst_int(cur)-FirstLowInvalidHeapAttributeN...
postgres=# explain (selectidfromtest_dm)except(selectidfromtest_dm2); QUERY PLAN---HashSetOpExcept(cost=0.00..383303.38rows=1000000width=4)->Append (cost=0.00..355803.34rows=11000017width=4)->Subquery Scanon"*SELECT* 1" (cost=0.00..32346.00rows=1000000width=4)->Seq Scanontest_dm (cost=0...
select*fromstarmerx_user_permissionwhere(user_name,location_id,permission_type)notin(('xxx',315,'internal_in_sign')) 回到顶部 43 表大小 --查询单个表的总大小,包括该表的索引大小selectpg_size_pretty(pg_total_relation_size('tab'))assize;--查询所有表空间大小selectspcname, pg_size_pretty(pg_ta...
SELECT. The first step of the rewrite process adds target list entries for any columns that were not assigned to by the original command but have defaults. Any remaining columns (with neither a given value nor a default) will be filled in by the planner with a constant null expression.For...
postgres=# select2/1;?column?---2(1row) 在下面堆栈中构造ExprState 代码语言:javascript 代码运行次数:0 运行 AI代码解释 (gdb)bt #0ExecInitExpr(node=0x28ddf28,parent=0x0)at execExpr.c:126#10x0000000000871a3cinevaluate_expr(expr=0x28ddf28,result_type=23,result_typmod=-1,result_collation...
SQL with t_wait as (select a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.objid,a.objsubid,a.pid,a.virtualtransaction,a.virtualxid,a,transactionid,b.query,b.xact_start,b.query_start,b.usename,b.datname from pg_locks a,pg_stat_activity b where a.pid=b.pid and ...
postgresql 在GROUP BY之前使用EXCEPT查询失败在这种情况下，您试图在对两个子查询应用EXCEPT子句后聚合它们...
It’s worth noting that using ACLs on columns can sometimes lock users out. This happens because a wildcard in a SELECT * FROM query includes all columns, even those the user doesn't have access to, leading to an access denied message. To avoid this, users should explicitly list...
Fixed an issue with multiple parentheses in SELECT columns. Fixed an issue with handling of column name alias which may cause client to hang if column name alias contains string of length more than 64 bytes, for example, select col as '您对“数据一览“中的车型,颜色,内饰,选装, '. Fixed ...