Indexes speed up data retrieval from "summary" of SQL and Relational Theory by C. Date
Indexes are an important concept in databases. An index is a data structure that lets the system find specific rows quickly, without having to examine every row in the table. In other words, an index speeds up data retrieval by providing a shortcut to the desired information. Without an index, the system would have to read every row in a table to find the data we're looking for. This process can be time-consuming and inefficient, especially for large tables with a significant amount of data. By creating an index on one or more columns in a table, we can significantly improve the performance of queries that use those columns in the WHERE clause. When a query is ...
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