hibernate- querying for rows, with distinct pair of values from two columns

Question

I have a table like:

id|column_1|column_2|column_3|
 0|   A    |   100  |   10   |
 1|   B    |   100  |   20   |
 2|   C    |   1000 |   10   |
 3|   D    |   100  |   10   |

and i want to query such that i want distinct(column_2 and column_3), means combination of column_2 and column_3 have to be distinct . So the result I want is like:

id|column_1|column_2|column_3|
 0|   A    |   100  |   10   |
 1|   B    |   100  |   20   |
 2|   C    |   1000 |   10   |

I'm using STS MVC & hibernate4, with mysql. Any suggestion is appreciated.

Code I'm using right now is:

Session ses=sf.getCurrentSession();
Criteria criteria=ses.createCriteria(myclass.class);
ProjectionList projList = Projections.projectionList();
projList.add(Projections.property("column_2"));
projList.add(Projections.property("column_3"));
criteria.setProjection(Projections.distinct(projList));

but its just returning the distinct values, i want the complete row.

Answer 1

Try this one:

select column1, column2, column3 from table group by column2, column3

Regards, Arun