few imp questions

Q1) Find discrepancy in the tables given below. ENO ENAME AGE DNO 101 MOHIT 28 A01 102 RAHUL 30 A02 103 SONIA 23 A01 104 NIKHIL 45 A03 105 GARIMA 38 A04 DEPARTMENT DNO DNAME DLOCATION A01 HUMAN RESOURCE NOIDA A02 IT DELHI A03 ADMINISTRATION DELHI ANSWER: Department A04 does not exist in its parent table department, hence it can not be mentioned as dno(a04) in employee table. This will result in an error. q2)create jumbled word like this :  RoUtInE String a = jTextField1.getText(); String u=a.toUpperCase(); int b = a.length(); String c = ""; int i; while (i<b) { if(i%2!=0) String k = u.substring(i,i+1).toLowerCase(); else String k = u.substring(i,i+1); c=c.concat(k); i++; } System.out.print(k); Q1) Find discrepancy in the tables given below. ENO ENAME AGE DNO 101 MOHIT 28 A01 102 RAHUL 30 A02 103 SONIA 23 A01 104 NIKHIL 45 A03 105 GARIMA 38 A04 DEPARTMENT DNO DNAME DLOCATION A01 HUMAN RESOURCE NOIDA A02 IT DELHI A03 ADMINISTRATION DELHI ANSWER: Department A04 does not exist in its parent table department, hence it can not be mentioned as dno(a04) in employee table. This will result in an error. q2)create jumbled word like this :  RoUtInE String a = jTextField1.getText(); String u=a.toUpperCase(); int b = a.length(); String c = ""; int i; while (i<b) { if(i%2!=0) String k = u.substring(i,i+1).toLowerCase(); else String k = u.substring(i,i+1); c=c.concat(k); i++; } System.out.print(k); Tell two different methods to convert integer/ double/ float to String form.(toString(),valueOf())       Ms.Geeta created two tables with city as primary key in table1 and foriegn key in table 2. While inserting some set of values, she is facing a problem that she is unable to enter a value in column city of table2. what must be the reason/?  ans: Ms. geeta must be trying to enter the value which is not present in column city of table1.