More Efficient way to Concat Rows

Hi I have this problem with a query to process data concatenating
Units/Modules.
I have one View called Certificates thats lists Course IDs, Candidate
Names and Units. As each Certificate shows multiple Units achieved by
the Candidate I need to transform this data and combine the Units into
a single value - so I have 1 row per certificate rathan than 1 row per
unit.
I have been using this Query and several UDF's (Unit names, Unit
Grades, Unit Award dates etc) but as the database incresed in size the
query is timing out - Is there a more efficient way to do this ? Also
the function seems to create duplicates so i am using DISTINCT and
thisn seems to slow it down too. Help!
Thanks
hals_left
SELECT DISTINCT CourseID, CandidateID,dbo.GetUnits(CandidateID,
CourseID) AS Units
FROM Certificates
CREATE FUNCTION dbo.GetUnits
(@.CandidateID AS smallint, @.CourseID AS smallint )
RETURNS varchar(1000)
AS
BEGIN
DECLARE @.str AS varchar(1000)
SET @.str = ''
SELECT @.str = @.str + UnitTitle + char(13) + char(10)
FROM Certificates
WHERE CandidateID = @.CandidateID AND CourseID= @.CourseID
RETURN @.str
ENDIf this is just formatting for display then it isn't obvious why you
would need to do it in the database. The simplest and most likely
fastest method is in the client or presentation tier. See:
http://msdn.microsoft.com/library/d...
etstringmethod(recordset)ado.asp
David Portas
SQL Server MVP
--|||I agree but the client application (Word 2K Mailmerge) isnt capable of
this.|||Hello, hals_left
To make sure that the function is not called too many times, use a
query like this:
SELECT CourseID, CandidateID,
dbo.GetUnits(CandidateID, CourseID) AS Units
FROM (
SELECT DISTINCT CourseID, CandidateID,
FROM Certificates
) x
Razvan

Monitoring Query Performance

Is there any table in SQL Server 2000 which lists the queries currently
cached in memory and statistics on those queries e.g. execution time, number
of executions cost, etc. I would like to be able to determine the queries
that have the highest cost to target for performance tuning first.
Not really. You have some information in master..syscacheobjects, but that are only the cached plans
(those that are cached in the first place, of course). You can have a profiler trace running to pick
up the measures you are interested in and to your tuning based on that profiler trace.
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://www.solidqualitylearning.com/
"Simon" <Simon@.discussions.microsoft.com> wrote in message
news:C5531A9C-7344-4734-B041-7A83FA31F5F8@.microsoft.com...
> Is there any table in SQL Server 2000 which lists the queries currently
> cached in memory and statistics on those queries e.g. execution time, number
> of executions cost, etc. I would like to be able to determine the queries
> that have the highest cost to target for performance tuning first.

Monitoring Query Performance

Is there any table in SQL Server 2000 which lists the queries currently
cached in memory and statistics on those queries e.g. execution time, number
of executions cost, etc. I would like to be able to determine the queries
that have the highest cost to target for performance tuning first.Not really. You have some information in master..syscacheobjects, but that are only the cached plans
(those that are cached in the first place, of course). You can have a profiler trace running to pick
up the measures you are interested in and to your tuning based on that profiler trace.
--
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://www.solidqualitylearning.com/
"Simon" <Simon@.discussions.microsoft.com> wrote in message
news:C5531A9C-7344-4734-B041-7A83FA31F5F8@.microsoft.com...
> Is there any table in SQL Server 2000 which lists the queries currently
> cached in memory and statistics on those queries e.g. execution time, number
> of executions cost, etc. I would like to be able to determine the queries
> that have the highest cost to target for performance tuning first.

Monitoring Query Performance

Is there any table in SQL Server 2000 which lists the queries currently
cached in memory and statistics on those queries e.g. execution time, number
of executions cost, etc. I would like to be able to determine the queries
that have the highest cost to target for performance tuning first.Not really. You have some information in master..syscacheobjects, but that a
re only the cached plans
(those that are cached in the first place, of course). You can have a profil
er trace running to pick
up the measures you are interested in and to your tuning based on that profi
ler trace.
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://www.solidqualitylearning.com/
"Simon" <Simon@.discussions.microsoft.com> wrote in message
news:C5531A9C-7344-4734-B041-7A83FA31F5F8@.microsoft.com...
> Is there any table in SQL Server 2000 which lists the queries currently
> cached in memory and statistics on those queries e.g. execution time, numb
er
> of executions cost, etc. I would like to be able to determine the queries
> that have the highest cost to target for performance tuning first.