Select Query with Case

Select t3.LocationName, t1.CourseSDate,t1.CourseEDate,
CASE WHEN GI.CorporateId = 0 THEN GI.CompanyName ELSE CO.CORPORATENAME END AS ComapyName , ' ' as Venue from TRAN_SCINTERESTEDCOURSES t1
INNER JOIN TRAN_SCGENERALINFO GI ON T1.StudnetCardId = GI.StudnetCardId
 left JOIN MST_LOCATION t3 on t3.LocationId=t1.LocationId
 LEFT JOIN MST_CORPORATEDETAIL CO ON CO.CORPORATEID = GI.CorporateId where T1.StudnetCardId=4127