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Yatra.com Interview Question for Software Engineer / Developers


Country: India
Interview Type: In-Person
More Questions from This Interview



Comment hidden because of low score. Click to expand.
0
of 4 vote

select studentName from student where 'DS' IN(subject1,subject2,subject3,subject4,subject5)
OR 'Networking' IN (subject1,subject2,subject3,subject4,subject5)

- Sumanth January 25, 2012 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

i agree with sumanth..good approach bro

- rockstar January 26, 2012 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

Above Query is wrong.It would also return students studying more than 2 subjects.We need to return students studying either DS or Networking and not any other subjects, else the query is pretty easy.

So we can do concatenation of all the subjects and check that it is either DSNetworking or NetworkingDS. This would do the job.

- Algorithmist April 14, 2013 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 vote

Any approach that doesn't involve explicitly listing the subjects?

- eugene.yarovoi January 26, 2012 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

Only thought I get is, stored procedure and use information_schema(in case of mysql). I am also looking for a single query

- Sumanth February 04, 2012 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 vote

select * from student where "DS" IN (sub1, sub2, sub3, sub4, sub5) AND "Networking" IN (sub1, sub2, sub3, sub4, sub5);

- Darshan October 01, 2014 | Flag Reply
Comment hidden because of low score. Click to expand.
-1
of 1 vote

select studentName from student where (subject1='DS' OR subject1='Networking') OR (subject2='DS' OR subject2='Networking') OR (subject3='DS' OR subject3='Networking') OR (subject4='DS' OR subject4='Networking') OR (subject5='DS' OR subject5='Networking')

- durai January 25, 2012 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

any other better approach than this. I also replied with this solution but the interviewer was keen to know any better approach, as the number of subjects may increase it is not much efficient.

- priyankajaggi4 January 25, 2012 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

Well, even with possible 5 different subjects the subjects should go into another table. And then join the student table with the subjects table for the query.

select distinct studentName from students, subjects where students.id = subjects.id and (subjects.title = 'DS' or subject.title = 'Networking')

- Selmeczy, Péter January 26, 2012 | Flag


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