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SELECT 专业 AS SUBS(学号,3,2),平均分 AS AVG(成绩) FROM 选课 WHERE 课程号="101" GROUP BY 专业 SELECT SUBS(学号,3,2) AS 专业,AVG(成绩) AS 平均分 FRON 选课 WHERE 课程号="101" GROUP BY 1 SELECT SUBS(学号,3,2) AS 专业,AVG(成绩) AS 平均分 FRON 选课 WHERE 课程号="101" ORDER BY 专业 SELECT 专业 AS SUBS(学号,3,2),平均分 AS AVG(成绩) FRON 选课 WHERE 课程号="101" ORDER BY 1
SELECT 专业 AS SUBS(学号,3,2),平均分AS AVG(成绩)FROM选课 WHERE 课程号="101"GROUP BY专业 SELECT SUBS(学号,3,2)AS专业,AVG(成绩)AS平均分FROM选课 WHERE课程号="101"GROUP BY 1 SELECT SUBS(学号,3,2)AS专业,AVG(成绩)AS平均分FROM选课 WHERE课程号="101"ORDER BY专业 SELECT专业AS SUBS(学号,3,2),平均分AS AVG(成绩)FROM选课 WHERE课程号="101"ORDER BY 1
SELECT 专业 AS SUBS(学号,3,2),平均分 AS AVG(成绩) FROM 选课 WHERE 课程号="101" GROUP BY 专业 SELECT SUBS(学号,3,2) AS 专业,AVG(成绩) AS 平均分 FROM 选课 WHERE 课程号="101" GROUP BY 1 SELECT SUBS(学号,3,2) AS 专业,AVG(成绩) AS 平均分 FROM 选课 WHERE 课程号="101" ORDER BY 专业 SELECT 专业 AS SUBS(学号,3,2),平均分 AS AVG(成绩) FROM 选课 WHERE 课程号="101" ORDER BY 1
101×102×103 100×101×102 99×100×101 98×99×100
不存在x0∈R,2>0 存在x0∈R,2≥0 对任意的x∈R,2x≤0 对任意的x∈R,2x>0
a1+a101>0 a2+a100<0 a3+a99=0 a51=51
近中面加蜡 远中面加蜡 唇面加蜡 舌面加蜡 颈缘加蜡
t=S*(G)1/2 t=S1*(δG)1/3 t=S2*(G)1/2 t=S*(δG)1/3