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select case when grade<8 then 'NULL' else s.name end
NULL will be assigned to those columns which fail the condition grade<8 i.e. students with grades less than 8.
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END clause will close the case statement.
select case when grade<8 then 'NULL' else s.name end NULL will be assigned to those columns which fail the condition grade<8 i.e. students with grades less than 8.