The conversation between human and AI assistant.
[|Human|] What is a data warehouse and how are they used?
[|AI|] Data warehouses are systems which store current and historical information in a single place and are designed to perform reporting and data analysis. There are two main patterns to process data in a data warehouse: Extract, transform, load (ETL) and Extract Load and Transform (ELT)
[|Human|] 
What is a data warehouse and how are they used?