Difference between fetchall vs fetchone vs fetchmany

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in python, when working with database operations using a cursor object, there are several methods available to retrieve data from a query result. the most commonly used methods are fetchall(), fetchone(), and fetchmany().

1. fetchall(): this method retrieves all rows from the query result. it returns a list of tuples, each representing a row of the result set. if there are no more rows to fetch, it returns an empty list.

example:


2. fetchone(): this method retrieves the next row of a query result set, returning a single tuple or none if no more rows are available.

example:


3. fetchmany(): this method retrieves the next set of rows of a query result, returning a list of tuples. you can specify the number of rows to fetch using the size parameter.

example:


these methods provide flexibility in fetching data from a database query result based on your specific requirements. choose the appropriate method depending on whether you need to retrieve all rows at once, fetch rows one by one, or fetch a specific number of rows at a time.

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