视图是一种虚拟表 ,本身是不具有数据 的,占用很少的内存空间,它是 SQL 中的一个重要概念.视图建立在已有表的基础上, 视图赖以建立的这些表称为基表.视图的创建和删除只影响视图本身,不影响对应的基表。但是当对视图中的数据进行增加、删除和修改操作时,数据表中的数据会相应地发生变化,反之亦然。视图...
现在A、B发生了转账行为(假设都有10w元,小明给小红转账10w元)--从A账户减去5w元UPDATEaccountSETmoney=money-50000WHEREname="A";--小红对应的账户增加100元UPDATEaccountSETmoney=money+50000WHEREname="B";--说明: 上面的2条SQL可以被认为是一个事务 其中有任何一条SQL语句执行错误或系统宕机都会导致数据恢复到...
When true, the layer is visible in the view. Value of this property is inherited from the layer.visible unless the developer overrides it. The layerView.visible will take precedence over layer.visible if both properties are set. Default Value:true visibleAtCurrentScale Inherited Property visib...
This has been identified in: Bug 2798026ORA-6550 / PLS-905 WHEN RUNNING PL/SQL OVER DBLINK TO READ ONLY STANDBY DATABASE 询问客户当前数据库是个怎样的架构,客户反馈:源端是19C的RAC,生产库是11.2.0.2 RAC,在生产库上建立了DBLINK访问19C上的数据,并且源端的19C是一个Dataguard环境的备端。 看起来...
Dear all expert, I created SQL query which link to View. It works in Oracle SQL Developer(View had been created), but not in BI Publisher.
OleDbCommand cmd =newOleDbCommand(sql, conn);foreach(DataGridViewRow rowindataGridView1.Rows) { cmd.Parameters.AddWithValue("@Value1", row.Cells["Column1"].Value); cmd.Parameters.AddWithValue("@Value2", row.Cells["Column2"].Value);
A helper component is written by a developer working in the presentation tier, while the delegate is typically written by a developer working on the services in the business tier. (Note: The delegate may also be provided as part of a framework.) Thus, this strategy is as much about who ...
Point being hovered in the chart, in the view's spatial reference. ElevationProfileLine id String Unique identifier for the profile line. ElevationProfileLine include IntersectItem|Iterable<IntersectItem>|Iterable<Iterable<IntersectItem>>|null|undefined Items which are to be hit when query...
This name is visible to users in the View list. DisplayName Name IsValidForForm False IsValidForRead True LogicalName name RequiredLevel SystemRequired Type String Format Text FormatName Text ImeMode Auto IsLocalizable True MaxLength 200 OfflineSqlQuery 展開資料表 PropertyValue Description String...
IN { # 根DNS、B网主机对非sunlinux.com请求则找根 type hint; file "named.ca"; }; zone "sunlinux.com" IN { type master; file "sunlinux.com.Bzone"; # B网主机对非sunlinux.com请求规则 }; }; view anyother { match-clients { Other; }; # 非限定网段主机 zone "." IN { type hint...