How to fetch value from database in comma only for redundant data in C#

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Hi coder,

I have a table in which I have to columns

DPS Skill
X A
X B
Y c
Y D

how to get the data in

DPS Skill
X A,B
Y C,D

And store them in DataTable in c# I search few code but that doesn't match my requirement any help will be appreciated.

Thanks in Advance.

What I have tried:

Till now I tried to

C#

StringBuilder skills = new StringBuilder();
                    for (int i = 0; i < dtSkills.Rows.Count; i++)
                    {
                        for (int j = 0; j < dtSkills.Rows.Count; j++)
                        {
                            if (dtSkills.Rows[i]["DemandPrimarySkill"].ToString().Equals(dtSkills.Rows[j]["DemandPrimarySkill"].ToString()))
                            {
                                if (dtSkills.Rows[i]["Skill"].ToString().ToUpper().Trim().Equals(dtSkills.Rows[j]["Skill"].ToString().ToUpper().Trim()))
                                {
                                    if (!String.IsNullOrEmpty(skills.ToString()))
                                    {
                                        skills.Append(",");
                                    }
                                    skills.Append(dtSkills.Rows[j]["Skill"].ToString());
                                }
                            }
                            else
                            {
                                break;
                            }

                        }

           }

in this I have dtSkill in which I have all the DPS and related to that DPS I have skills I try to append skill with string builder but not got what I desire.

Posted 25-Jul-16 21:29pm

amitesh1989

Updated 26-Jul-16 4:42am

Vincent Maverick Durano

v2

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Suvendu Shekhar Giri · Answer 1 · 2016-07-25T22:07:00

Solution 1

You can achieve such result using STUFF()
Check following example-

SQL

DECLARE @tbl AS TABLE(DPS VARCHAR(10),Skill VARCHAR(10))
INSERT INTO @tbl
SELECT 'X','A'
UNION ALL
SELECT 'X','B'
UNION ALL
SELECT 'Y','C'
UNION ALL
SELECT 'Y','D'


SELECT DPS,
STUFF((SELECT ', ' + A.Skill FROM @tbl A
WHERE A.DPS=B.DPS FOR XML PATH('')),1,1,'') AS [Skill]
From @tbl B
GROUP BY DPS

Hope, it helps :)

Posted 25-Jul-16 22:07pm

Suvendu Shekhar Giri

Comments

amitesh1989 26-Jul-16 5:23am

@suvendu -This table is just an example their are 1000 data in the table in DB. Database is already create I just need to fetch the data from it and store it in Datatable or how can I use declare command in code behind.

Richard Deeming 26-Jul-16 10:24am

If any of the values in the Skill column contain "special" characters, they will be XML-encoded in the output.

You can work around that by using FOR XML PATH(''), TYPE, and then adding .value('.', 'varchar(max)') before the comma. Anith Sen posted a detailed overview of the different options back in 2008:
Concatenating Row Values in Transact-SQL[^]

User 11060979 · Answer 2 · 2016-07-26T04:08:00

Try this, should help you to solve your request.

DemoTable:

SQL

CREATE TABLE Demo 
(
  DPS CHAR(30),
  SKILL CHAR(30)
);

Test Data:

SQL

INSERT INTO Demo (DPS, SKILL) VALUES
('X', 'A'),
('X', 'B'),
('Y', 'C'),
('Y', 'D');

Test SQL:

SQL

SELECT  DPS,
        SKILLVALS= STUFF((SELECT RTRIM(SKILL) + ','
                          FROM Demo D2
                          WHERE D2.DPS = D1.DPS
                          ORDER BY D2.SKILL
                          FOR XML PATH('')), 1, 0, '')
FROM Demo D1
GROUP BY D1.DPS
ORDER BY D1.DPSS

Test Result:

DPS  SKILLVALS
---  ---------
X    A,B,
Y    C,D,

Small drawback: The ',' at the end of SKILLVALS.

And no, I did not find this solution by studying the MSDN documentation :)
Here you find the information: SQL Server Grouped Concatenation - SQLPerformance.com[^], search for 'FOR XML PATH' there.

I hope it helps.

[Edit] Thanks to Richard Deeming - Professional Profile[^], see his comment to the above solution.

SQL

SELECT DPS,
       SKILLVALS= STUFF((SELECT ',' + RTRIM(SKILL) 
                         FROM Demo D2
                         WHERE D2.DPS = D1.DPS
                         ORDER BY D2.SKILL
                         FOR XML PATH('')), 1, 1, '')
FROM Demo D1
GROUP BY D1.DPS
ORDER BY D1.DPS

Finally the result without leading or trailing ',':

DPS  SKILLVALS
---  ---------
X    A,B
Y    C,D