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Java: Prefer simple views #1957

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renejeglinsky merged 1 commit into from
Jul 7, 2025
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Java: Prefer simple views #1957

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2 changes: 1 addition & 1 deletion java/working-with-cql/query-execution.md
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Expand Up @@ -239,7 +239,7 @@ To [write data](#updatable-views) or [delete](#delete-via-view) through views, o
For simple [projections](../../cds/cdl#as-projection-on), the generation of SQL views can be avoided by using [runtime views](#runtimeviews). This allows you to change the view definition without redeploying the database schema and is the prerequisite for lightweight extensibility via predefined extension fields.

::: tip Prefer simple views
Prefer creating multiple simple views, each tailored to a specific use case, rather than a single complex view that tries to address multiple use cases simultaneously.
Apply the *Interface Segregation Principle*: design multiple simple views, each for a specific use case ([Single-Purposed Services](../../guides/providing-services#single-purposed-services)), rather than one complex view for many scenarios.
:::
::: warning Avoid selecting paths over to-many Associations
Do not use [path expressions](../../cds/cql#path-expressions-in-all-other-clauses) over [*to-many associations*](../../cds/cdl#to-many-associations) in the select clause of CDS views. This blocks write operations and may cause performance issues due to record duplication on read.
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