# Amazon Redshift Analyze all of your data with the fastest and most widely used cloud data warehouse. > Amazon Redshift is based on PostgreSQL. Amazon Redshift and PostgreSQL have a number of very important differences that you must be aware of as you design and develop your data warehouse applications. [read more](https://docs.aws.amazon.com/redshift/latest/dg/c_redshift-and-postgres-sql.html) Amazon Redshift is compatible with postgresql just use the ODBC connection in the environment variable `DATABASE_URL` with the parameter `OpenSourceSubProtocolOverride` to make pREST connect to the database. ```sh DATABASE_URL=postgresql://localhost:5432/postgres?OpenSourceSubProtocolOverride=true ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.prestd.com/integrations/amazon-redshift.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.