How to get a unique value in a row for different list of values?

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This is the query I have written:

select c.id, CONCAT(c.major_version, '.', c.minor_version) as versions from event_ids c where c_id in ('101') group by c_id, major_version, minor_version;

This is the result I am getting

|id  | versions|
|----|-------- | 
|101 | 0.0     | 
|101 | 1.0     | 
|101 | 2.0     | 
|101 | 3.0     |

I am trying to get a single value against a list of different values for the same entry

|id  | versions|
|----|-------- | 
|101 | 0.0     | 
|    | 1.0     | 
|    | 2.0     | 
|    | 3.0     |

How do I write the query so I get the desired result?

What I have tried:

This is the query I have written:

select c.id, CONCAT(c.major_version, '.', c.minor_version) as versions from event_ids c where c_id in ('101') group by c_id, major_version, minor_version;

Posted 4-Jan-22 22:32pm

Member 15489491

Updated 7-Jan-22 4:40am

v2

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Richard Deeming 5-Jan-22 4:42am

The simple answer: don't. This is a presentation issue; you should handle it in the code which is displaying the results to the user, not the query.

Member 15489491 5-Jan-22 4:47am

so which data structure should I use to save this result?

Richard Deeming 5-Jan-22 4:49am

Whatever structure makes the most sense in your program.

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CHill60 · Accepted Answer · 2022-01-07T04:40:00

Which ever "structure" you use to display the results you cannot get away from the fact that the query will return your data as

|id  | versions|
|----|-------- | 
|101 | 0.0     | 
|101 | 1.0     | 
|101 | 2.0     | 
|101 | 3.0     |

It has to, otherwise how would you know that version 2.0 belongs with id 101?

As Richard has already pointed out, the place to start presenting these results in a different way is in the Presentation or UI layer. In this case you might want to consider populating a TreeView - e.g see TreeView (JavaFX 8)[^]