Aggregate functions in SQL are used to perform calculations on a set of rows and return a single row. Examples of aggregate functions include COUNT(), SUM(), AVG(), MAX(), and MIN().

They do not perform calculations across a set of table rows that are related to the current row. This is typically done using JOIN operations in SQL.

Aggregate functions can be used with the GROUP BY clause in SQL to divide the result set into groups of rows. For example, you could use the COUNT() function to count the number of rows in each group.

Aggregate functions do not directly collect statistics about a database. However, they can be used as part of queries to gather statistical information.

Finally, aggregate functions do not recover or reuse disk space occupied by updated or deleted rows. This is typically handled by the database management system itself.

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Aggregate functions in SQL are used to perform calculations on a set of rows and return a single row. Examples of aggregate functions include COUNT(), SUM(), AVG(), MAX(), and MIN().

They do not perform calculations across a set of table rows that are related to the current row. This is typically done using JOIN operations in SQL.

Aggregate functions can be used with the GROUP BY clause in SQL to divide the result set into groups of rows. For example, you could use the COUNT() function to count the number of rows in each group.

Aggregate functions do not directly collect statistics about a database. However, they can be used as part of queries to gather statistical information.

Finally, aggregate functions do not recover or reuse disk space occupied by updated or deleted rows. This is typically handled by the database management system itself.

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Aggregate functions in SQL are used to perform calculations on a set of rows and return a single row. Examples of aggregate functions include COUNT(), SUM(), AVG(), MAX(), and MIN().

They do not perform calculations across a set of table rows that are related to the current row. This is typically done using JOIN operations in SQL.

Aggregate functions can be used with the GROUP BY clause in SQL to divide the result set into groups of rows. For example, you could use the COUNT() function to count the number of rows in each group.

Aggregate functions do not directly collect statistics about a database. However, they can be used as part of queries to gather statistical information.

Finally, aggregate functions do not recover or reuse disk space occupied by updated or deleted rows. This is typically handled by the database management system itself.

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