sql avg()
snippet in sql

sql avg()


/*AVG() is an aggregate function that returns the 
   average value for a numeric column*/
SELECT AVG(column_name)
FROM table_name;

sql count


/* 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;