Querying data in ADLS Gen2 storage using T-SQL is made easy because of the OPENROWSET function with additional capabilities (check out the T-SQL that is supported). The currently supported file types in ADLS Gen2 that SQL-on-demand can use are Parquet, CSV, and JSON. ParquetDirect and CSV 2.0 add performance improvements (see Benchmarking Azure Synapse Analytics – SQL Serverless, using .NET Interactive). You can also query folders and multiple files and use file metadata in queries.
Read on to learn a lot more about its use cases.