How to write order by in linq - linq

This code output is like this
a 1
b 12
I wont to get out put like this
b 12
a 1
Query:
var x1 = (from v in db3.VoteRecords
join v2 in db3.Partis on v.PartiID equals v2.ID
where v.ProvinceID == (int)cmbProvience.SelectedValue
&& v.DistrictID == (int)cmbDistrict.SelectedValue
group v by new { v2.PartiName } into g
select new
{
Parti = g.Key.PartiName,
Votes = (from vt in g
select g.Key.PartiName).Count()
});
dataGridView1.DataSource = x1;

You can add this at the end
{
Parti = g.Key.PartiName,
Votes = (from vt in g
select g.Key.PartiName).Count()
}).OrderByDescending(l =>l.Parti);
If you want to order by the Votes column. Do this:
{
Parti = g.Key.PartiName,
Votes = (from vt in g
select g.Key.PartiName).Count()
}).OrderByDescending(l =>l.Votes);
Or if you first want to order by Parti and then by Votes do this:
{
Parti = g.Key.PartiName,
Votes = (from vt in g
select g.Key.PartiName).Count()
}).OrderByDescending(l =>l.Parti).ThenByDescending (l =>l.Votes);
Or if you first want to order by Votes and then by Parti do this:
{
Parti = g.Key.PartiName,
Votes = (from vt in g
select g.Key.PartiName).Count()
}).OrderByDescending(l =>l.Votes ).ThenByDescending (l =>l.Parti);

Related

Left join with LINQ with entityframework

I try to make a left query with linq:
public IQueryable<Mutatie> GetMutaties()
{
var query = (from m in context.Mutatie
join d in context.tblDienstverband on m.fkDienstVerbandID equals d.DienstverbandID
join med in context.tblMedewerker on d.fkMedewerkerID equals med.MedewerkerID
where med.fkKlantID == this.klantId
select m).Include(d => d.fkDienstVerbandID);
return query;
}
But how to make this to have a left query?
Thank you
I have it now like this:
var query = (from m in context.Mutatie
join d in context.tblDienstverband on m.fkDienstVerbandID equals d.DienstverbandID into grp
from d in grp.DefaultIfEmpty()
join med in context.tblMedewerker on d.fkMedewerkerID equals med.MedewerkerID into grp1
from med in grp.DefaultIfEmpty()
where med.fkMedewerkerID == this.klantId
select new { m, d, med });
return query;
It should like this:
NOTE: d and med are null if no row match
public IQueryable<Mutatie> GetMutaties()
{
var query = (from m in context.Mutatie
join d in context.tblDienstverband on m.fkDienstVerbandID equals d.DienstverbandID into grp
from d in grp.DefaultIfEmpty()
join med in context.tblMedewerker on d.fkMedewerkerID equals med.MedewerkerID into grp_med
from med in grp_med.DefaultIfEmpty()
where med.fkKlantID == this.klantId
//select new { m, d, med };
select m;
return query;
}

PIG - Get Highest & Lowest Medal Winning Nations , GROUPed by Year

Pretty new to Pig , I have a dataset which consists of Olympics data
for 4-5 years. I am trying to generate highest and lowest medal
winning countries split by every year. Hers's a sample with header.
ATHLETE,COUNTRY,YEAR, SPORT,GOLD,SILVER,BRONZE,TOTAL
Yang Yilin,China,2008,Gymnastics,1,0,2,3
Leisel Jones,Australia,2000,Swimming,0,2,0,2
Go Gi-Hyeon,South Korea,2002,Short-Track Speed Skating,1,1,0,2
Chen Ruolin,China,2008,Diving,2,0,0,2
Katie Ledecky,United States,2012,Swimming,1,0,0,1
Ruta Meilutyte,Lithuania,2012,Swimming,1,0,0,1
Dániel Gyurta,Hungary,2004,Swimming,0,1,0,1
Arianna Fontana,Italy,2006,Short-Track Speed Skating,0,0,1,1
Olga Glatskikh,Russia,2004,Rhythmic Gymnastics,1,0,0,1
Kharikleia Pantazi,Greece,2000,Rhythmic Gymnastics,0,0,1,1
I tried my options as per my knowledge to get this , but with little
sucess.
This is what i have now. Any help on solving this will be
appreciated !
DEFINE MYOVER org.apache.pig.piggybank.evaluation.Over;
DEFINE MYSTITCH org.apache.pig.piggybank.evaluation.Stitch;
A = LOAD 'MortDataSite/MyPigExercise/OlympicMedals.csv' using PigStorage(',') as (ATHLETE:CHARARRAY,COUNTRY:CHARARRAY,YEAR:INT,SPORT:CHARARRAY,GOLD:INT,SILVER:INT,BRONZE:INT,TOTAL:INT);
B = FOREACH A GENERATE YEAR,COUNTRY,TOTAL;
C = GROUP B BY (YEAR,COUNTRY);
D = FOREACH C GENERATE FLATTEN(group) as (YEAR,COUNTRY) ,SUM(B.TOTAL);
E = GROUP D BY (YEAR,COUNTRY);
F = FOREACH E {
E1 = ORDER D BY TOT DESC;
GENERATE FLATTEN(MYSTITCH(E1, MYOVER(E1,'dense_rank',0,1,1)));
};
G = FOREACH F GENERATE stitched::YEAR,stitched::COUNTRY ,stitched::TOT,$3;
MyOutput : ( Considering there are many nations with same TOTAL Medals
, I expect more than one country may share one RANK )
(2000,Cuba,65,1)
(2000,Iran,4,1)
(2000,Chile,17,1)
(2000,China,79,1)
(2000,India,7,1)
(2000,Italy,65,1)
(2000,Japan,42,1)
(2000,Kenya,7,1)
(2000,Qatar,1,1)
(2000,Spain,42,1)
(2000,Brazil,48,1)
Expected Ouput : 1
YEAR COUNTRY MAX(TOTAL)
2001 India 50
2003 UK 90
2006 Japan 56
&
Expected Ouput : 2
YEAR COUNTRY MIN(TOTAL)
2001 India 5
2003 UK 10
2006 Japan 6
********* Updated Query ( Working Well as expected ) ****
Here's the updated query which gave me my desired result.
DEFINE MYOVER org.apache.pig.piggybank.evaluation.Over;
DEFINE MYSTITCH org.apache.pig.piggybank.evaluation.Stitch;
A = LOAD 'MortDataSite/MyPigExercise/OlympicMedals.csv' using PigStorage(',') as (ATHLETE:CHARARRAY,COUNTRY:CHARARRAY,YEAR:INT,SPORT:CHARARRAY,GOLD:INT,SILVER:INT,BRONZE:INT,TOTAL:INT);
B = FOREACH A GENERATE YEAR,COUNTRY,TOTAL;
C = GROUP B BY (YEAR,COUNTRY);
D = FOREACH C GENERATE FLATTEN(group) as (YEAR,COUNTRY) ,SUM(B.TOTAL);
E = GROUP D BY (YEAR,COUNTRY);
F = FOREACH E GENERATE FLATTEN(group) as (YEAR,COUNTRY) ,MAX(D.TOT) as MTOT;
G = GROUP F BY YEAR;
H = FOREACH G {
G1 = ORDER F BY MTOT DESC;
GENERATE FLATTEN(MYSTITCH(G1, MYOVER(G1,'dense_rank',0,1,1)));
};
J = FOREACH H GENERATE stitched::YEAR,stitched::COUNTRY ,stitched::MTOT,$3;
**Ouput : **
YEAR COUNTRY MAX(TOTAL).RANKING
(2000,United States,242,1)
(2000,Russia,187,2)
(2000,Australia,182,3)
(2002,United States,84,1)
(2002,Canada,74,2)
(2002,Germany,61,3)
(2004,United States,265,1)
(2004,Russia,190,2)
(2004,Australia,156,3)
If you would like to get the MAX and MIN total medals by country by year,just use MAX and MIN.
B = FOREACH A GENERATE YEAR,COUNTRY,TOTAL;
C = GROUP B BY (YEAR,COUNTRY);
D = FOREACH C GENERATE FLATTEN(group) as (YEAR,COUNTRY) ,SUM(B.TOTAL) as TOTAL;
E = GROUP D BY (YEAR,COUNTRY);
F = FOREACH E GENERATE group as (YEAR,COUNTRY),MAX(D.TOTAL);
G = FOREACH E GENERATE group as (YEAR,COUNTRY),MIN(D.TOTAL);
DUMP F;
DUMP G;

get the sum of the maxs group by

I have this table
EquipmentId Value Date
1 2 11/04/2013
1 1 11/04/2013
2 3 11/04/2013
2 2 10/04/2013
2 5 10/04/2013
3 1 10/04/2013
3 3 11/04/2013
I want to group these items by date, and have a dictionary with the date as a key and the sum of the maxs of the all equipments values in that day
the result would be like this
[10/04/2013: 6] // 6 = 5 (as the max of values of the the equipmetId 2) + 1 (as the max of values of the the equipmetId 3)
[11/04/2013: 5] // 5 = 2(as the max of values of the the equipmetId 1) + 3(as the max of values of the the equipmetId 3)
I managed to make the query to get this without the sum, meaning for only one equipment.
var consumptionValues = (from c in context.ConsumptionSet
join pi in context.PropertiesInstanceSet on c.PropertiesInstanceID equals pi.PropertiesInstanceID
join ep in context.EquipmentPropertiesSet on pi.EquipmentPropertiesID equals ep.EquipmentPropertiesID
join e in context.EquipmentSet on ep.EquipmentID equals e.EquipmentID
where (e.EquipmentID == equipmentId && pi.ProprietesName == ProprietesName.Energy && c.Date <= DateTime.Now && c.Date >= firstDayDate)
group c by SqlFunctions.DatePart("weekday", c.Date) into grp
select new
{
dayOfWeek = (DayOfWeek)grp.Key.Value - 1,
value = grp.Max(c => c.Value),
}).ToDictionary(c => c.dayOfWeek.ToString(), c => c.value);
It's the complete query with all the joins, in the example I just gave a simplified example.
Is it possible to do this in one single query ?
I have to say I'm not sure it will work, but you should give it a shot:
var consumptionValues = (from c in context.ConsumptionSet
join pi in context.PropertiesInstanceSet on c.PropertiesInstanceID equals pi.PropertiesInstanceID
join ep in context.EquipmentPropertiesSet on pi.EquipmentPropertiesID equals ep.EquipmentPropertiesID
join e in context.EquipmentSet on ep.EquipmentID equals e.EquipmentID
where (e.EquipmentID == equipmentId && pi.ProprietesName == ProprietesName.Energy && c.Date <= DateTime.Now && c.Date >= firstDayDate)
group new { c, e } by SqlFunctions.DatePart("weekday", c.Date) into grp
select new
{
dayOfWeek = (DayOfWeek)grp.Key.Value - 1,
value = grp.GroupBy(i => i.e.EquipmentID).Sum(g => g.Max(i => i.c.Value)),
}).ToDictionary(c => c.dayOfWeek.ToString(), c => c.value);

Linq select subgroup

I have the following in my db table:
- MailingId | GroupName | ServiceId
- 1 | group1 | 3
- 2 | group1 | 5
- 3 | group1 | 8
- 4 | group2 | null
- 5 | group3 | null
...
In my view i have 2 groups of checkboxes:
1) (services) with id's 3,5,8 (serviceId).
2) and a list of checkboxes for mailing groups (group1, group2, group3)
I need to select the following using LINQ:
Select rows that I have selected in ServiceId checkbox list PLUS any other. For example if I check off ServiceId's (3 and 5) and group "Group3" then my output would be rows MailingId: 1, 3 and 5. HOWEVER, if I select ANY service from (first group of checkboxes) AND DO NOT select "Group1" from mailing group checkboxes then rows with Group1 SHOULD NOT be in the output.
I'm using EF4. Please help.
Thanks
The 2 arrays would be the selections that are posted from your view
int[] selectedservices = {3,5};
string[] selectedgroups = {"group3"};
using (Model model = new Model())
{
bool b = selectedservices.Contains(1);
var mailinglists = from m in model.MalingSet
where selectedgroups.Contains(m.GroupName)
&& ((m.ServiceId.HasValue && selectedservices.Contains(m.ServiceId.Value)) || m.ServiceId.HasValue == false)
select m.MailingId;
}
Try something like this.
var mailingGroup =
from m in Mailings
where m.ServiceId != null // or whatever other condition
group m by m.GroupName into g
select new
{
groupName = g.Key,
mailings = g
};
It's a Where clause no?
var a = new {m = 1, g = "group1", sid = 3};
var b = new {m = 2, g = "group1", sid = 5};
var c = new {m = 3, g = "group1", sid = 8};
var d = new {m = 4, g = "group2", sid = 0};
var e = new {m = 5, g = "group3", sid = 0};
var l = new List<dynamic>{a,b,c,d,e};
l.Where(it => ( new ArrayList{3, 5}).Contains(it.sid)
|| (new ArrayList{1, 5}).Contains(it.m)).Dump();
http://www.linqpad.net/

Convert to Lambda expression

I have the following expression
var q = from c in D1
join dp in
(from e in E1
group e by e.ID into g
select new { ID = g.Key, Cnt = g.Count() })
on c.ID
equals dp.ID
into dpp from v in dpp.DefaultIfEmpty()
select new { c.ID, Cnt= v.Cnt ?? 0 };
How can i convert this to Lambda expression?
Here's one way to go. This kind-of matches the above.
var subquery = E1
.GroupBy(e => e.Id)
.Select(g => new { ID = g.Key, Cnt = g.Count()});
//.ToList();
var q = D1
.GroupJoin(
subquery,
c => c.ID,
dp => dp.ID,
(c, g) => new {ID = c.ID, Cnt=g.Any() ? g.First().Cnt : 0 }
)
After refactoring, I came up with this:
var q = D1
.GroupJoin(
E1,
d => d.ID,
e => e.ID,
(d, g) => new {ID = d.ID, Cnt = g.Count()}
);
For comparision, the query comprehension form is:
var q = from d in D1
join e in E1 on d.ID equals e.ID into g
select new {ID = d.ID, Cnt = g.Count()};
Why would you want to convert it?
For complex queries like this one the query syntax you have used here is invariably clearer.

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