How Can I get my sproc to return records with 0 as ClientID

Can anyone help me modify this sproc's Where clause or Joins to let (T) task records with a 0 to be returned?

If I enter a ClientID I want to return only those task records with the ClientID I entered (this works).

If I enter no ClientID I want to return all task records, even those with a 0 in the ClientID field.

ALTER PROCEDURE dbo.CMAdmin

@.SID int

AS
SELECT
A.CompanyName,
C.FirstName,
C.LastName,
C.ClientID,Convert(varchar(10),
T.ActionDate, 10) AS [Action Date],
T.Priority,
T.Status,
T.Subject,
T.Note,
T.CompletionDate, 10) AS Completed,
T.DateEntered AS Entered,
T.EnteredBy AS [Entered By],

CASE
WHEN A.[CompanyName] IS NULL OR A.[CompanyName] = '' THEN
C.[FirstName] +' '+ C.[LastName]
ELSE A.[CompanyName]
END AS DRName

FROM
tblClients C LEFT OUTER JOIN tblClientAddresses A
ON C.ClientID = A.ClientID LEFT OUTER JOIN dbo.tblTasks T
ON C.ClientID = T.ClientID

WHERE
C.ClientID = Isnull(@.SID,C.ClientID)

hi

u can modify the where close like this

ALTER PROCEDURE dbo.CMAdmin

@.SID int

AS
SELECT
A.CompanyName,
C.FirstName,
C.LastName,
C.ClientID,Convert(varchar(10),
T.ActionDate, 10) AS [Action Date],
T.Priority,
T.Status,
T.Subject,
T.Note,
T.CompletionDate, 10) AS Completed,
T.DateEntered AS Entered,
T.EnteredBy AS [Entered By],

CASE
WHEN A.[CompanyName] IS NULL OR A.[CompanyName] = '' THEN
C.[FirstName] +' '+ C.[LastName]
ELSE A.[CompanyName]
END AS DRName

FROM
tblClients C LEFT OUTER JOIN tblClientAddresses A
ON C.ClientID = A.ClientID LEFT OUTER JOIN dbo.tblTasks T
ON C.ClientID = T.ClientID

WHERE
C.ClientID = COALESCE(@.SID,C.ClientID)

this query will return all records when client id is null and when it is not null it only returns rows specified in the where condition

for more details

http://www.sqlteam.com/item.asp?ItemID=2077

regards