How can we select the elements which have common Dept_name in both the relation ?

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answerhappygod
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How can we select the elements which have common Dept_name in both the relation ?

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a) Select * from instructor i , course c where i.Dept_name=c.Dept_name;
b) Select Dept name from instructor ,Course ;
c) Select * from instructor i , course c ;
d) Select Dept_name from instructor where Dept_name = NULL;
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