Hello,
I would like some help on developing a SQL query.
I have a Team table and a Person Table. For simplicity sake, lets say
the Team has a key and team name. The Person has a person key, team
key, and person name.
I want to query for all team members, and store the results in a single
column. So, the resulting view would have three columns: team key, team
name, and a list of all people on the team.
Any pointers or tips appreciated,
J Wolfgang GoerlichSELECT T.team_key, T.team_name, P.person_name
FROM Team AS T
JOIN Person AS P
ON T.team_key = P.team_key ;
David Portas
SQL Server MVP
--|||Here is a sample:
=====
CREATE TABLE Team
(
TeamID INT,
TeamName VARCHAR(20)
)
GO
CREATE TABLE Person
(
PersonID INT,
TeamID INT,
PersonName VARCHAR(50)
)
GO
INSERT INTO Team VALUES (1, 'Development')
INSERT INTO Team VALUES (2, 'Release')
INSERT INTO Person VALUES (1, 1, 'Bob')
INSERT INTO Person VALUES (2, 1, 'Mason')
INSERT INTO Person VALUES (3, 2, 'Chris')
INSERT INTO Person VALUES (4, 2, 'Scott')
INSERT INTO Person VALUES (5, 2, 'Bruce')
GO
=====
The above just creates some sample tables and data. Now, we can define a
function that concatenates the list of team members as follows:
=====
IF (OBJECT_ID ('dbo.formTeamList') IS NOT NULL)
DROP FUNCTION dbo.formTeamList
GO
CREATE FUNCTION dbo.formTeamList (@.teamID INT)
RETURNS VARCHAR(8000) AS
BEGIN
DECLARE @.teamList VARCHAR(8000); SET @.teamList = ''
SELECT
@.teamList = @.teamList + ', ' + ISNULL (PersonName, '')
FROM
Person
WHERE
TeamID = @.teamID
RETURN (STUFF (@.teamList, 1, 2, ''))
END
GO
=====
Once done, we can test this out as follows:
=====
SELECT
TeamID, TeamName, dbo.formTeamList (TeamID)
FROM
Team
=====
Although the method shown above works, it is not recommended as there are
limitations:
(1) The function is called for every row in the team table. This can cause
performance problems for large lists.
(2) The function can only concatenate a list of 8000 characters in length
(4000 if you are using UniCode).
Such logic is usually best handled in the application tier of your program,
sinnce you have good flexibility to rotate rows into columns.
--
HTH,
SriSamp
Email: srisamp@.gmail.com
Blog: http://blogs.sqlxml.org/srinivassampath
URL: http://www32.brinkster.com/srisamp
<jwgoerlich@.gmail.com> wrote in message
news:1131967790.112616.168370@.g44g2000cwa.googlegroups.com...
> Hello,
> I would like some help on developing a SQL query.
> I have a Team table and a Person Table. For simplicity sake, lets say
> the Team has a key and team name. The Person has a person key, team
> key, and person name.
> I want to query for all team members, and store the results in a single
> column. So, the resulting view would have three columns: team key, team
> name, and a list of all people on the team.
> Any pointers or tips appreciated,
> J Wolfgang Goerlich
>
