Existing Text-to-SQL benchmarks remain idealized compared with enterprise scenarios, which require massive query scopes, complex schemas, and scattered external knowledge. We present BIRD-Ent and Spider-Ent, two enterprise-oriented benchmarks constructed via a refinement framework, together with Dual-Retrieval-Augmented-Generation (DRAG) Text-to-SQL, which formalizes table-schema and knowledge retrieval before SQL generation. The benchmarks feature over 4,000 columns per query and, for BIRD-Ent, documents totaling 1.5M tokens. Evaluation on state-of-the-art models shows sharp drops, with only 39.1% EX on BIRD-Ent and 60.5% EX on Spider-Ent. These results establish the Ent-series as a discriminative testbed for structurally robust and retrieval-aware Text-to-SQL.