SQL Aggregate Functions - W3Schools
https://www.w3schools.com/sql//sql_aggregate_functions.asp
The following are the commonly used SQL aggregate functions: AVG () – returns the average of a set. COUNT () – returns the number of items in a set. MAX () – returns the maximum value in a set. MIN () – returns the minimum value in a set. SUM () – returns the sum of all or distinct values in a set. AVG () – returns the average of a set. COUNT () – returns the number of items in a set. MAX () – returns the maximum value in a set. MIN () – returns the minimum value in a set COUNT (column_name | *) returns the number of rows in a table. SUM (column_name) returns the sum of the values of a numeric column.
AVG () – returns the average of a set.
COUNT () – returns the number of items in a set.
MAX () – returns the maximum value in a set.
MIN () – returns the minimum value in a set.
SUM () – returns the sum of all or distinct values in a set.
MIN () – returns the minimum value in a set
COUNT (column_name | *) returns the number of rows in a table.
SUM (column_name) returns the sum of the values of a numeric column.
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