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1. Sparse data: efficient storage and retrieval in an RDBMS    stackoverflow.com

I have a table representing values of source file metrics across project revisions, like the following: 

Revision FileA FileB FileC FileD FileE ...
1          ...

2. Hibernate database specific columnDefinition values    stackoverflow.com

the problem is as follows: We're using hibernate with annotations as O/R Mapper. Some @Column annotations look like: @Column(columnDefinition = "longblob", name = "binaryData", nullable = true) or @Column(columnDefinition = "mediumtext", name = "remark", nullable ...

3. Hibernate One To Many Problem    stackoverflow.com

I am doing a proof of concept for one to many mapping with no success. My schema is as follows: 

Student ---->Phone
class Student 
public class Student implements java.io.Serializable 
{
   private Set<Phone> ...