Query data with group of categories

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112435    Micheal Angelo    01-02-2015
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903625   Sammuel Jackson    15-03-2015
905863   Jim Carrey         03-04-2015

Can someone help me on this? I need some guide to do this.

Posted 6-Sep-15 21:49pm

Luiey Ichigo

Updated 17-Sep-15 10:12am

Patrice T

v2

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Sinisa Hajnal 7-Sep-15 4:38am

Guide: google "SQL Group by clause" also try PARTITION BY

[no name] 17-Sep-15 16:33pm

Most probably I do no understand all your Detail request.
For me it Looks simply left join the categories and Group by it (and maybe other fields)...what I'm missing?

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vagelis1 · Answer 1 · 2015-09-17T01:55:00

With mySql it cannot be done. You can try LinQ to SQL instead.
users is the name of your table.

to do this

Accountant
112435 Micheal Angelo 01-02-2015
113254 Adam Sandler 03-02-2015

C#

var grouped = users.GroupBy(g => g.Position).Select(s => new { Position =   s.FirstOrDefault().Position, Users = s  });

or to get a count

Accountant
2
Programmer
1

C#

var grouped = users.GroupBy(g => g.Position).Select(s => new { Position = s.FirstOrDefault().Position, UsersCount = s.Count()  }).Dump();

George Swan · Answer 2 · 2015-09-17T09:31:00

I'd do something like this.

C#

var grouped =
             users.GroupBy(user => user.Position)
                 .Select(selection => new { Position = selection.Key, Users = selection })
                 .OrderBy(a => a.Position);
         foreach (var group in grouped)
         {
             Console.WriteLine("Position: {0} Number of staff {1}", group.Position, group.Users.Count());
             foreach (var user in group.Users)
             {
                 Console.WriteLine("{0} {1} {2}", user.ID, user.Name, user.DateJoined.ToShortDateString());
             }
             Console.WriteLine();
         }

Query data with group of categories

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