Query a table in one database from another. For security reasons, you’ll likely want to create a read-only user to act as the go-between. This foreign user is the user that we’ll use for user mapping, which will be discussed later in this article.
A foreign data wrapper is an extension available in PostgreSQL that allows you to access a table or schema in one database from another. Foreign data wrappers can serve all sorts of purposes:
A data lake is totally different from a data warehouse in terms of structure and function. Here is a truly quick explanation of "Data Lake vs Data Warehouse".
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This post explains what a data connector is and provides a framework for building connectors that replicate data from different sources into your data warehouse
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