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 vote236 views1 answer
Oracle query archive mode
SQL
1 vote219 views1 answer
Mysql show current queries
SQL
10 votes227 views1 answer
Create table oracle
SQL
21 votes222 views3 answers
Average sql
SQL
44 votes238 views6 answers
Rename command in sql
SQL
0 vote213 views1 answer
Python mysql query where
SQL
1 vote220 views2 answers
Sql now - 1 day
SQL
0 vote239 views1 answer
Drop tables from local database postgres pgadmin
SQL
11 votes218 views2 answers
MySQL DISTINCT
SQL
0 vote233 views1 answer
C# execute transact sql
SQL