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Query expressions provide a language integrated syntax for queries that is similar to relational and hierarchical query languages such as SQL and XQuery. Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the Clarion# language. With LINQ, a query is now a first-class language construct, just like classes, methods, events, etc.
Query expressions are written in a declarative query syntax. By using query syntax, you can perform even complex filtering, ordering, and grouping operations on data sources with a minimum of code. You use the same basic query expression patterns to query and transform data in SQL databases, ADO.NET Datasets, XML documents and streams, and .NET collections.