join on NEW是触发器中的一种条件,它用于在触发器中通过连接(join)操作将触发器事件(如插入、更新)中的数据(NEW)与其他表进行关联。这样可以方便地进行数据的联合查询和处理。 以下是对于PostgreSQL触发器execute procedure和join on NEW的详细解释: execute procedure: ...
[ argument [, ...] ] ) [ AS ] alias [ ( column_alias [, ...] | column_definition [, ...] ) ] function_name ( [ argument [, ...] ] ) AS ( column_definition [, ...] ) from_item [ NATURAL ] join_type from_item [ ON join_condition | USING ( join_column [, ......
select count(1) from stcdlbxxxxx;count---35000000(1 row) stcdlbxxxxx 表数据量 3500W,数据量不算大,这条SQL主要含义应该是对 fact 表做统计,一堆聚合函数,fact 表是数仓概念,如果不明白可以去百度。 这条SQL主要慢在HashAggregate这个节点上,Hash Semi Join 花了 30237.230毫秒(30秒),然后到上面 Group ...
Seq Scanonhh_adds_static_day (cost=0.00..261864.36rows=4241981 width=4) (actualtime=0.012..1407.214rows=4228109 loops=1) Filter: (create_time <='2020-09-30 00:00:00'::timestampwithouttimezone) RowsRemovedbyFilter: 735600 PlanningTime: 0.108 ms ExecutionTime: 1585.835 ms (5rows) abce=# ...
11.9/11.10或12.5中有一个简单的语句,我们可以使用where子句或ON子句来编写连接。
(): self._join_aborted = True logger.error('No initialize key in DCS and PostgreSQL is running as replica, aborting start') logger.error('Please first start Patroni on the node running as master') sys.exit(1) self.dcs.initialize(create_new=(self.cluster.initialize is None), sysid=data...
#enable_bitmapscan = on # 允许或禁止查询规划器使用位图扫描计划类型。默认值是on #enable_hashagg = on # 允许或禁用查询规划器使用哈希聚集计划类型。默认值是on #enable_hashjoin = on # 允许或禁止查询规划器使用哈希连接计划类型。默认值是on ...
create table p (a int) partition by list (a); create table p1 partition of p for values in (1); create table p2 partition of p for values in (2); set enable_partitionwise_join to on;6.3 索引消除重复项 PostgreSQL 13中对索引的重复的项做了优化处理,更节省空间。重复的项只存储一次。
[cus].[Name]AS[CustomName]FROM[Order] oLeftJOIN[Custom] cusON([o].[CustomId] = [cus].[Id])LeftJOIN[OrderDetail] oritemON([o].[Id] = [oritem].[OrderId])LeftJOIN[OrderDetail] oritem2ON([o].[Id] = [oritem2].[OrderId])WHERE([o].[Id] = @Id0) ...
禁止某种运算的SQL语法:SET enable_运算类型 = off; //或者=false开启某种运算的SQL语法:SET enable_运算 = on; //或者=true执行计划可以改变的运算方法如下: enable_bitmapscanenable_hashaggenable_hashjoinenable_indexscanenable_indexonlyscanenable_materialenable_mergejoinenable_nestloopenable_seqscan...