AVG () averaging function:
Find the average value of the SAL attribute in the EMP table mysql> Select AVG (SAL) as Salaverage from emp;+-------------+| Salaverage |+-------------+| 2073.214286 |+-------------+1 row in Set (0.11 sec)//emp table Data mysql> select * from emp;+-------+--------+-----------+--- ---+------------+---------+---------+--------+| Empno | ename | Job | Mgr | HireDate | Sal | Comm | Deptno |+-------+--------+-----------+------+------------+---------+---------+--------+| 7369 | SMITH | Clerk | 7902 | 1980-12-17 | 800.00 | NULL | 20 | | 7499 | ALLEN | Salesman | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 | | 7521 | WARD | Salesman | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 | | 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 | | 7654 | MARTIN | Salesman | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 | | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 | | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 | | 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 | 3000.00 | NULL | 20 | | 7839 | KING | President | NULL | 1981-11-17 | 5000.00 | NULL | 10 | | 7844 | TURNER | Salesman | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 | | 7876 | ADAMS | Clerk | 7788 | 1987-05-23 | 1100.00 | NULL | 20 | | 7900 | JAMES | Clerk | 7698 | 1981-12-03 | 950.00 | NULL | 30 | | 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 | | 7934 | MILLER | Clerk | 7782 | 1982-01-23 | 1300.00 | NULL | |+-------+--------+-----------+------+------------+---------+---------+--------+
SUM () Sum function:
Select as from EMP; +----------+| Salsum 29025.00 |+----------+1inset (0.11 sec)
COUNT () Counting function:
// see the number of males and females in the student table Select from student GROUP by Ssex; +------+-------------+| Ssex | Count (Sage) |+------+-------------+| M | 1 | | Women | 3 | | Male | 6 |+------+-------------+
MYSQL/MARIADB study Record--Query 3