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Editorial Team
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Asked: 2026-05-30T00:41:36+00:00

Suppose I have a relationship 1 to N, for example Student , College. Student

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Suppose I have a relationship 1 to N, for example

Student , College.

Student Attributes: 

Name,Surname,CollegeFKey,

College attributes:

CollegeKey,Other,Other.

Suppose that I have a program which read students and Exams from a plain text file. And, on this file I have duplicated Colleges and Duplicated Studends.

Like in denormalized tables:

CollegeId,Other,Other,Name,Surname,CollegeFkey.

e.g.

1,x,y,Mike,M,1
1,x,y,R,P,1
...
...
...

You see, I have to check in this case always that in my normalized db, I have still not inserted in the Table College 2 times the key 1.

How can I solve this in Hbase or Cassandra? I mean, if I have 10000.. tables and rows, I don’t want check for every Primary Key and then for every FK, if it was inserted OK?

How can I solve that? I can use no-sql db for work directly in de-normalized datas?
Can you link me to an example that solve this problem?

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1 Answer

  1. Editorial Team

    You can use Cassandra http://wiki.apache.org/cassandra/ with some high level language client (I use Hector for java https://github.com/rantav/hector). In Cassandra you will describe ColumnFamily College in this ColumnFamily you write Student columns which contains information about students.

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