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What is In clause

 
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What is In clause in sql
difference between exist cluase and IN clause
 
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Get the list of students that have secured good grades
SELECT s.name from student s WHERE s.grade IN ('A','B','C')

Get the list of students that have secured good grades and are not in the badstudents list
SELECT s.name from student s WHERE NOT EXISTS ( SELECT 1 FROM badstudents b where b.studentid = s.studentid) AND s.grade IN ('A','B','C')
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