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Aggregate functions
AGGREGATE functions
Analysis and calculations performed on multiple rows of a table are called aggregate functions.
Important aggregate functions are as follows
COUNT() - counts the number of rows that meet the given conditions
MAX() & MIN() - return the largest & smallest value that meet the query conditions
SUM() & AVG() - return the sum and average of the values in the column
GROUP BY - used to combine rows with identical values into summary rows.
It is typically used with aggregate functions such as COUNT, SUM, etc
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Learning course: SQL at Work
Problem Link: Aggregate functions in SQL at Work