Order By Statement - sql

Question

I want to order the Time in ASC for the below query. I tried adding ORDER BY after WHERE clause but can't get the result as join statements are used. I have added the full sql query here.
ALTER PROCEDURE [dbo].[USP_GetFlightInfo]
(
#Origin NVARCHAR(50)=null,
#Destination NVARCHAR(50)=null,
#FlightNo NVARCHAR(50)= null
)
AS
BEGIN
SET NOCOUNT ON;
IF #FlightNo IS NULL
(
SELECT tfs.FlightNo,tfs.Origin,tfs.Destination,tfs.[Time],tfs.RevisedTime,tfSSS.DescriptionName, tfSS.FlightStatus from tblFlightSchedule tfs
INNER JOIN tblFlightStatus tfSS ON tfs.FSId= tfSS.FSId
LEFT OUTER JOIN tblFlightStatusDescription tfSSS ON tfSSS.FSDId= tfs.FSDId
where tfs.Origin=#Origin and tfs.Destination =#Destination
ORDER BY tfs.[Time];
)
ELSE IF #FlightNo IS NOT NULL
(
SELECT tfs.FlightNo,tfs.Origin,tfs.Destination,tfs.[Time],tfs.RevisedTime,tfSSS.DescriptionName, tfSS.FlightStatus from tblFlightSchedule tfs
INNER JOIN tblFlightStatus tfSS ON tfs.FSId= tfSS.FSId
LEFT OUTER JOIN tblFlightStatusDescription tfSSS ON tfSSS.FSDId= tfs.FSDId
where tfs.Origin=#Origin and tfs.Destination =#Destination and tfs.FlightNo=#FlightNo and tfs.FlightNo =#FlightNo
ORDER BY tfs.[Time];
)
END

Answer 1

Just put:
SELECT tfs.FlightNo,tfs.Origin,tfs.Destination,tfs.[Time],tfs.RevisedTime,
tfSSS.DescriptionName, tfSS.FlightStatus
FROM tblFlightSchedule tfs
INNER JOIN tblFlightStatus tfSS ON tfs.FSId= tfSS.FSId
LEFT OUTER JOIN tblFlightStatusDescription tfSSS ON tfSSS.FSDId= tfs.FSDId
WHERE tfs.Origin=#Origin and
tfs.Destination =#Destination and
(
tfs.FlightNo =#FlightNo or
#FlightNo is null
)
ORDER BY tfs.[Time];
As the code inside your stored procedure. No need for the IF and duplicating the query.
The main issue in your existing code is that SQL Server uses BEGIN and END to enclose blocks of code - not brackets (). So an IF should look like:
IF <Something>
BEGIN
--If block
END
ELSE
BEGIN
--Else block
END