Join on demand是SAP CDS (Core Data Services)视图的一个重要特性,它允许您在CDS视图中实现延迟连接,从而优化查询性能。通过在需要时执行连接操作,而不是在每次查询时都执行连接,可以减少数据库的负担,提高查询性能。 在SAP CDS视图中,通常会涉及到多个实体(表)之间的连接操作,例如INNER JOIN、LEFT OUTER JOIN等。
SAP CDS view 里借助 `path expression` 技术，我们可以实现 `join on demand` 的场景。`Join on de...
SAP CDS view 里借助path expression技术,我们可以实现join on demand的场景。 如下图所示: Join on demand是SAP CDS (Core Data Services)视图的一个重要特性,它允许您在CDS视图中实现延迟连接,从而优化查询性能。通过在需要时执行连接操作,而不是在每次查询时都执行连接,可以减少数据库的负担,提高查询性能。 在S...
This Article demonstrates concept of CDS associations and coding path expression in SQL statements and in CDS view. I will also explain how we can specify Inner join instead of left outer join which is default for CDS associations. SAP wants us to use associations instead of joins because they...
本文阐述了ABAP CDS association的概念,并且展示了在CDS视图中和SQL语句中写路径表达式(Path Expression)代码的方法。我也会解释如何在CDS asociation中指定inner join——默认情况下是left outer join,以及如何为association添加过滤。 对于CDS的相关开发,SAP希望我们使用association而不是join,因为association更加接近“概念思...
I was able to resolve this issue by changing the tables, and making BSEG as my first table.Wanted to check if we can activate the CDS view without changing the order of the tables? If I remove the path expression _lfa1.name and replace it with _lfa1 so that it is exposed to consum...
When a CDS view is activated, a join defined by an association is built for every use in a path expression and not for the definition of the association. No joins are constructed for associations that are not used in their CDS views. ...
Add the company_name of the business partner to the SELECT list using the associations header and buyer in a path expression Add the payment_status from the invoice header to the SELECT list using the association header ABAP Copy header.payment_status Done Step 5 Add a CASE statement If ...
When a CDS view is activated, a join defined by an association is built for every use in a path expression and not for the definition of the association. No joins are constructed for associations that are not used in their CDS views. Associations and join expressions can be used in a SEL...
The new ABAP annotation AbapCatalog.compiler.compareFilter can be used to specify whether the filter conditions are compared for the path expressions of a view. In this case, the associated join expression is evaluated once only, if the same filter condition occurs. Modification...