Question

I have a table

Create table Country_State_Mapping
(
    Country nvarchar(max),
    State nvarchar(max)
)

With 5 records.

Insert into Country_State_Mapping values('INDIA', 'Maharastra')
Insert into Country_State_Mapping values('INDIA', 'Bengal')
Insert into Country_State_Mapping values('INDIA', 'Karnatak')
Insert into Country_State_Mapping values('USA', 'Alaska')
Insert into Country_State_Mapping values('USA', 'California')

I need to write a SQL query which will have give me 2 records/2 columns as below.

1st column Contry and second AllStates

1 record(2 columns) will be

India and Maharastra,Bengal,Karnatak

2nd

USA and Alaska,California

I tried I like this

select distinct
    OutTable.Country,
    (select State
     from Country_State_Mapping InnerTable
     where InnerTable.Country = OutTable.Country)
from Country_State_Mapping AS OutTable

but did not work…

Answer 1

SELECT Country, AllStates = 
    STUFF((SELECT ', ' + State
           FROM Country_State_Mapping b 
           WHERE b.Country = a.Country
           FOR XML PATH('')), 1, 2, '')
FROM Country_State_Mapping a
GROUP BY Country