sql count
/*COUNT(column_name) will return the number of rows from the column
that are not NULL*/
SELECT COUNT(column_name)
FROM table_name;
/*COUNT(*) will return the number of rows from the table*/
SELECT COUNT(*)
FROM table_name;sql count
/*COUNT(column_name) will return the number of rows from the column
that are not NULL*/
SELECT COUNT(column_name)
FROM table_name;
/*COUNT(*) will return the number of rows from the table*/
SELECT COUNT(*)
FROM table_name;sql average
SELECT AVG(column_name)
FROM table_name
WHERE condition;how to find average in sql
SELECT FIRST_NAME FROM EMPLOYEES
WHERE SALARY = (SELECT AVG(SALARY) FROM EMPLOYEES);sql avg()
/*AVG() is an aggregate function that returns the
average value for a numeric column*/
SELECT AVG(column_name)
FROM table_name;sql average
SELECT student_name, avg(notes) FROM student_notes GROUP BY student_name;Copyright © 2021 Codeinu
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