sum sql

SELECT SUM(column_name)

FROM table_name

WHERE condition; 

SELECT COUNT(column_name)

FROM table_name

WHERE condition; 

SELECT SUM(column_name)
FROM table_name
WHERE condition;

/* COUNT() is a function that takes on the name of a clomn as an argument
and counts the number of rows where the column is not null */

SELECT COUNT(column_name)
FROM table_name;

SELECT AVG(column_name)

FROM table_name

WHERE condition;