Indexes are most useful for columns that frequently appear in WHERE clauses of SQL commands, either to qualify the rows to select or for linking.

Name: Indexes are most useful for columns that frequently appear in WHERE clauses of SQL commands, either to qualify the rows to select or for linking.
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Indexes improve query performance by allowing faster retrieval of rows that match the conditions specified in WHERE clauses, especially for large datasets.

Indexes Are Most Useful for Columns That Frequently Appear in WHERE