SELECT AVG(column_name) FROM table_name 平均数
SELECT SUM(column_name) as column_name FROM table_name 和
SELECT COUNT(column_name) as column_name FROM table_name 计数
SELECT Max(column_name) as column_name FROM table_name 最大值
SELECT Min(column_name) as column_name FROM table_name 最小值
看你如何执行和搭配SQL命令。