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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
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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
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