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SELECT sno FROM sc WHERE sname="数据库"AND grade=MAX(grad SELECT sno FROM sc FOR sname="数据库"OR grade＞=MAX(grad SELECT sno FROM sc WHERE sname="数据库"AND grade=(SELECT MAX(grad FROM s SELECT sno FROM sc FOR sname="数据库"OR grade=(SELECT MAX(grad FROM s
SELECT sno FROM sc WHERE sname="数据库"AND grade=MAX(grad SELECT sno FROM sc FOR sname="数据库"OR grade>=MAX(grad SELECT sno FROM sc WHERE sname="数据库"AND grade=(SELECT MAX (grad FROM s SELECT sno FROM sc FOR sname="数据库" OR grade=(SELECT MAX (grad FROM s
good, good good, well well, good well, well
SELECT Sno，AVG(Grad FROM SC WHERE AVG(Grad＞=90 GROUP BY Sno SELECT Sno，AVG(Grad FROM SC GROUP BY Sno HAVING AVG(Grad＞=90 SELECT Sno，AVG(Grad FROM SC WHERE AVG(Grad＞=90 ORDER BY Sno SELECT Sno，AVG(Grad FROM SC GROUP BY Cno HAVING AVG(Grad＞=90
Select C#，AVG(grad From SCG Group by grade Order by 2，C# Desc Select C#，AVG(grad From SCG Group by C# Order by 2，C# Desc Select C#，AVG(grad From SCG Where C#，AVG Desc Group by grade Select C#，AVG(grad From SCG Group by AVG(grad Order by 2，C# Desc
at; for; to to; to; for at; to; for to; at; for
try to please their students treat their students as consumers understand their students well make sure their students understand
at；at with；with at；with with；at
few a few little a little
Chinese students are busy with their study Chinese students are too shy to communicate with others the environment is not good for Chinese students British students only want to make friends among themselves
at; for; to to; to; for at; to; for to; at; for
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