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ESQ-Bench is a new Oracle-first NL2SQL benchmark that evaluates model performance on complex enterprise schemas, revealing significant degradation and silent semantic divergence compared to academic benchmarks.
This paper introduces Schema-Aware Localisation (SAL), a lightweight middleware that grounds LLM-generated SQL queries in live Oracle schema catalog to eliminate hallucination errors, achieving 62.6% execution-grounded truth on TPC-H questions without manual schema curation.