Which command in SQL is used to extract information from multiple tables?

The command that is specifically used to extract information from multiple tables in SQL is "Join." This command combines rows from two or more tables based on a related column between them, which allows for comprehensive retrieval of data that may be spread across these tables.

Using Joins, you can create a combined set of results that pertains to a specific query, leveraging relationships such as one-to-one or one-to-many. For instance, if you have a table for customers and a table for orders, a Join can be used to pull all data associated with a customer's orders in a single query.

While "Select" is crucial as it specifies the columns you want to see from the tables, it does not inherently dictate the inclusion of multiple tables; it describes which particular data fields to retrieve. Thus, while "Select" can be used in conjunction with "Join" to choose specific fields from the resulting combined data set, it is not the command responsible for extracting data from multiple tables by itself.

The other commands—"Insert," which adds new records to a table, and "Update," which modifies existing records—serve different purposes in managing database data and do not facilitate the extraction of information across tables.