mysql - Separate 30 into three batches -

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there 30 students in classroom. want separate them 3 batches using mysql query in jsp.

initially did using below query 

connection = drivermanager.getconnection(connectionurl, "root", "student"); string querystring = "update student set batch=?,exam=? studentid='"+studentid+"'  "; pstatement = connection.preparestatement(querystring); pstatement.setstring(1, batch); pstatement.setstring(2, exam);

i don't have privileges comment check if ui sending second student info correctly. query looks ok me.


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