How to retrieve data from relation ‘Professor’ where department name is ‘Mathematics’ and salary is greater than ’65,000’?
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σdept_name = “Mathematics” ⋀ salary>65000 (Professor)
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σ “Mathematics” ⋀ salary>65000 (Professor)
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σdept_name = “Mathematics” and salary>65000 (Professor)
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σ salary>65000 (Professor) ⋀ dept_name = “Mathematics”
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