Sql average

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 student_name, avg(notes) FROM student_notes GROUP BY student_name;

How to find average in sql

SELECT FIRST_NAME FROM EMPLOYEES
WHERE SALARY = (SELECT AVG(SALARY) FROM EMPLOYEES);

Similar codes

0 vote186 views1 answer
Oracle current timestamp insert statement
SQL
1 vote204 views2 answers
Select only columns that are not empty oracle sql
SQL
0 vote187 views1 answer
Mysql command prompt date insert format
SQL
1 vote177 views1 answer
Sql auto timestamp
SQL
0 vote186 views1 answer
Snap craft
SQL
18 votes183 views4 answers
Foreign key mySql
SQL
1 vote175 views1 answer
MYSQL HOT TO COUNT THE DURATION BETWEEN TWO DATES
SQL
14 votes191 views2 answers
Install mysqldump
SQL
0 vote193 views1 answer
Sqlite insert or update
SQL
1 vote179 views1 answer
Set permanent SET GLOBAL sql_mode ubuntu
SQL