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mysql数据库 时间：2024-12-25 09:57:04
作者：文/会员上传
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#分组函数:用作统计使用,可嵌套使用USE myemployees;#sum 求和SELECT SUM(salary) FROM employees;#avg 求平均SELECT AVG(salary) FROM employees;#max 求最大值SELECT MAX
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#分组函数:用作统计使用,可嵌套使用USE myemployees;#sum 求和SELECT SUM(salary) FROM employees;#avg 求平均SELECT AVG(salary) FROM employees;#max 求最大值SELECT MAX(salary) FROM employees;#min 求最小值SELECT MIN(salary) FROM employees;#count 计算个数SELECT COUNT(salary) FROM employees;11-20
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