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sequences and indexes in database tables

What are sequences and indexes in database tables? When to use sequence and when to use index?

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An index is a feature in a database that allows quick access to the rows in a table. The index is created using one or more columns of the table. Not only is the index smaller than the original table (due to having fewer columns), but it is optimized for quick ...

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What are sequences and indexes in database tables?

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