Lukas Eder • 6/3/2024

Emulating SQL FILTER with Oracle JSON Aggregate Functions

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This technical article discusses the SQL:2003 FILTER clause for aggregate functions and its native support in various RDBMS. It focuses on the challenge of emulating FILTER with Oracle's JSON_ARRAYAGG and JSON_OBJECTAGG functions, where NULL values must be preserved. The article details the problem with standard CASE expression workarounds and presents a solution using JSON_TRANSFORM to correctly wrap and unwrap data, ensuring proper filtering semantics for JSON aggregation.

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#json #oracle #sql
Emulating SQL FILTER with Oracle JSON Aggregate Functions

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