SQL Quiz: What is a covering index?

Task 153:

Select the correct covering index definition from the options below:

An index that ensures unique values in columns.

An index that contains all the columns needed to run a query without accessing the table itself.

An index that covers all columns of the table.

An index that provides access to data in a specific sequence.

An index that ensures data integrity during changes in the table.

An index that synchronizes transactions in the database.

An index that determines the order in which queries are executed.

An index that provides information about the table structure.

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