How to use group by and also sum on a database record using linq

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i have a table structure that looks that this

HTML

listed_companyid       numberof_units              userid
-----------------     -----------------        -----------------
       2                     4                        2
       2                     2                        2
       1                     6                        2
       5                     3                        3

i want to be able to achieve the result below with my query when i group by listed_companyid an userid
for userid = 2
total_unit = 12

additionally, i want to have something like this too
for userid =2
listed_companyid = 2 , total= 6
listed_companyid = 1 , total = 6

What I have tried:

C#

var  listed = dbContext.listedCompanies.ToList();
    var stock = dbContext.stocks.Where(m=>m.userid == 2).ToList();
    var result = (from s in stock
                              join l in listed on s.listed_companyid equals l.id group s  by new { s.listed_companyid } into g select new
                              {
                                  g.Key,
                                  total_unit = g.Sum(s => s.numberof_units)
                              });

Posted 10-Jan-19 12:49pm

Mcbaloo

Updated 10-Jan-19 21:30pm

Maciej Los

v2

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2 solutions

Solution 1

dbContext.YourTable.groupby(p => p.listed_compnyid).(p => p.sum(px => px.select(px.number_ofunits))).FirstOrDefault();

Posted 10-Jan-19 14:32pm

koklimabc

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Maciej Los · Accepted Answer · 2019-01-10T21:30:00

Take a look at example:

C#

var data = new[] {
	new {listed_companyid = 2, numberof_units= 4, userid =2},
	new {listed_companyid = 2, numberof_units= 2, userid =2},
	new {listed_companyid = 1, numberof_units= 6, userid =2},
	new {listed_companyid = 5, numberof_units= 3, userid =3}
	};

var result = data.GroupBy(x=>x.userid)
	.Select(grp=> new
    {
        userid = grp.Key,
        totalunits = grp.Sum(x=>x.numberof_units)
    })
    .ToList();
result.Dump();

var result2 = data.GroupBy(x=>x.userid)
	.Select(grp=> new
    {
        userid = grp.Key,
		details = grp.GroupBy(x=>x.listed_companyid)
			.Select(subgrp=> new
				{
					companyid = subgrp.Key,
					units = subgrp.Sum(y=>y.numberof_units) 
				})
			.ToList()
    })
    .ToList();
result2.Dump();

Result:

userid totalunits
2      12 
3      3

Result#2

userid	details
userid	companyid	units
2	2	6
2	1	6
3	5	3

Good luck!