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SELECT COUNT(*) FROM t_grade;
SELECT COUNT(*) AS total FROM t_grade;
SELECT stuName,COUNT(*) FROM t_grade GROUP BY stuName;
SELECT stuName,SUM(score) FROM t_grade WHERE stuName="张三";
SELECT stuName,SUM(score) FROM t_grade GROUP BY stuName;
SELECT stuName,AVG(score) FROM t_grade WHERE stuName="张三";
SELECT stuName,AVG(score) FROM t_grade GROUP BY stuName;
SELECT stuName,course,MAX(score) FROM t_grade WHERE stuName="张三";
SELECT stuName,MAX(score) FROM t_grade GROUP BY stuName;
SELECT stuName,course,MIN(score) FROM t_grade WHERE stuName="张三";
SELECT stuName,MIN(score) FROM t_grade GROUP BY stuName;
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