The whole point of having an index is to speed up search queries by essentially cutting down the number of records/rows in a table that need to be examined.
an index is a data structure (most commonly a B- tree) that stores the values for a specific column in a table. An index is created on a column of a table . So, the key points to remember are that an index consists of column values from one table, and that those values are stored in a data structure. The index is a data structure
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