oracle - Sql query. Nested or not? -

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I am trying to list JR + SR students by their head but it is not working .. < / P> 

  SELECT STD_Major, Std_Class, AVG (Study_gpa) student where studs link and 'SR%' group like 'SR%' Group, Stadmager, Stady Class;

Maybe use or operator and < / Strong>


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