In the following procedurd, I get no results with either null parameters or date parameters, as shown below. However, when I use the literals (highlighted in green, it works fine.) What is wrong with the parameters?USE MHCGOALTER PROCEDURE dbo.usp_IHC_Report_Hospice_ReferralsLog @StartDate DateTime = NULL, @EndDate DateTime = NULLAS IF @StartDate IS NULL SET @StartDate = DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()) - 1, 0) IF @EndDate IS NULL SET @EndDate = DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0)SELECT DISTINCT VW_PT_DATA.PATIENT_CODE [ID], VW_PT_DATA.NAME_FIRST [First Name], VW_PT_DATA.NAME_LAST [Last Name], PT_ADMISSION.PHYSICIAN_ID1, PT_ADMISSION.PHYSICIAN_ID2, PT_ADMISSION.REFERRAL_SOURCE , PT_ADMISSION.PROSPECT_ADMIT_DATE, PT_ADMISSION.PROSPECT_TERM_DATE, PT_STATUS.STATUS_CODE, VW_RESOURCES.NAME_FIRST NAME_FIRST_2, VW_RESOURCES.NAME_LAST NAME_LAST_2, PT_STATUS.CREATE_DATE, VW_RESOURCES.ORGANIZATION_NAME, VW_RESOURCES_2.NAME_FIRST NAME_FIRST_3, VW_RESOURCES_2.NAME_LAST NAME_LAST_3, O_TEAM.TEAM_DESCRIPTION [Team], VW_PT_DATA.DATE_OF_BIRTH, A_DEMOGRAPHIC.DESCRIPTION DESCRIPTION_2, PT_PAY_SOURCE.INSURANCE_CODE [Payor], PT_ADMISSION.FIRST_CERTIFICATION_DATE, PT_STATUS.ADMISSION_ID, O_BRANCH.BRANCH_NAME [Branch], Case when VW_RESOURCES.ORGANIZATION_NAME is null then VW_RESOURCES.NAME_FIRST + ' ' + VW_RESOURCES.NAME_LAST else VW_RESOURCES.ORGANIZATION_NAME end Case_when_VW_RESOURCES_OR, Case when DatedifF(yy,VW_PT_DATA.Date_of_birth,getdate()) >=18 then '' else 'Yes' end Case_when_DatedifF_yy_VW, datename(month,PT_STATUS.STATUS_DATE) datename_month_PT_STATUS, datepart(month,PT_STATUS.STATUS_DATE) datepart_month_PT_STATUS, datepart(year,PT_STATUS.STATUS_DATE) datepart_year_PT_STATUS_S, Min(PT_STATUS.STATUS_DATE) [Referral Date]--Min_PT_STATUS_STATUS_DATEFROM VW_PT_DATA VW_PT_DATA INNER JOIN PT_ADMISSION PT_ADMISSION ON (PT_ADMISSION.PATIENT_ID = VW_PT_DATA.PATIENT_ID) INNER JOIN PT_STATUS PT_STATUS ON (PT_STATUS.ADMISSION_ID = PT_ADMISSION.ADMISSION_ID) AND (PT_STATUS.PATIENT_ID = PT_ADMISSION.PATIENT_ID) INNER JOIN A_PATIENT_STATUS A_PATIENT_STATUS ON (A_PATIENT_STATUS.ADMIN_SET_ID = PT_STATUS.ADMIN_SET_ID) AND (A_PATIENT_STATUS.STATUS_CODE = PT_STATUS.STATUS_CODE) LEFT OUTER JOIN VW_RESOURCES VW_RESOURCES ON (VW_RESOURCES.RESOURCE_ID = PT_ADMISSION.REFERRAL_SOURCE) INNER JOIN O_DATASET O_DATASET ON (O_DATASET.DATASET_ID = VW_PT_DATA.DATASET_ID) LEFT OUTER JOIN RES_ADDRESS RES_ADDRESS ON (RES_ADDRESS.RESOURCE_ID = VW_RESOURCES.RESOURCE_ID) LEFT OUTER JOIN VW_RESOURCES VW_RESOURCES_2 ON (VW_RESOURCES_2.RESOURCE_ID = PT_ADMISSION.PHYSICIAN_ID1) LEFT OUTER JOIN O_TEAM O_TEAM ON (O_TEAM.TEAM_ID = PT_ADMISSION.TEAM_ID) LEFT OUTER JOIN PT_DEMOGRAPHIC PT_DEMOGRAPHIC ON (PT_DEMOGRAPHIC.PATIENT_ID = PT_STATUS.PATIENT_ID) AND (PT_DEMOGRAPHIC.ADMIN_SET_ID = PT_STATUS.ADMIN_SET_ID) LEFT OUTER JOIN A_DEMOGRAPHIC A_DEMOGRAPHIC ON (A_DEMOGRAPHIC.DEMO_TYPE_ID = PT_DEMOGRAPHIC.DEMO_TYPE_ID) AND (A_DEMOGRAPHIC.DEMO_ID = PT_DEMOGRAPHIC.DEMO_ID) AND (A_DEMOGRAPHIC.ADMIN_SET_ID = PT_DEMOGRAPHIC.ADMIN_SET_ID) LEFT OUTER JOIN PT_PAY_CONTROL PT_PAY_CONTROL ON (PT_PAY_CONTROL.PATIENT_ID = PT_STATUS.PATIENT_ID) AND (PT_PAY_CONTROL.ADMIN_SET_ID = PT_STATUS.ADMIN_SET_ID) LEFT OUTER JOIN PT_PAY_SOURCE PT_PAY_SOURCE ON (PT_PAY_SOURCE.PATIENT_ID = PT_PAY_CONTROL.PATIENT_ID) AND (PT_PAY_SOURCE.ADMIN_SET_ID = PT_PAY_CONTROL.ADMIN_SET_ID) AND (PT_PAY_SOURCE.PAY_SOURCE_POINTER = PT_PAY_CONTROL.PRIMARY_POINTER) LEFT OUTER JOIN O_BRANCH O_BRANCH ON (O_BRANCH.BRANCH_ID = PT_STATUS.BRANCH_ID) AND (O_BRANCH.DATASET_ID = PT_STATUS.DATASET_ID)WHERE (( PT_STATUS.STATUS_CODE IN ('P01','P03') ) OR ((( PT_STATUS.STATUS_CODE LIKE 'A%' ) OR ( PT_STATUS.STATUS_CODE IN ('F01','F02','F03','F04','F05','F06') ) ) AND ( PT_ADMISSION.PROSPECT_ADMIT_DATE IS NULL ) )) AND ( O_DATASET.DATASET_NAME = 'AAA Hospice' )-- AND ( PT_STATUS.STATUS_DATE BETWEEN CONVERT(DATETIME,'2009-08-02',120) AND CONVERT(DATETIME,'2009-08-08 23:59:00',120) ) AND ( PT_STATUS.STATUS_DATE >= @StartDate AND PT_STATUS.STATUS_DATE < @StartDate) AND ( O_TEAM.DATASET_ID = VW_PT_DATA.DATASET_ID ) AND ( PT_DEMOGRAPHIC.DEMO_TYPE_ID = 1 ) AND ( PT_PAY_CONTROL.PAY_CONTROL_END_DATE IS NULL ) AND ( ( PT_STATUS.STATUS_DATE NOT LIKE PT_ADMISSION.FIRST_CERTIFICATION_DATE ) OR ( PT_ADMISSION.FIRST_CERTIFICATION_DATE IS NULL ) )GROUP BY VW_PT_DATA.PATIENT_CODE, VW_PT_DATA.NAME_FIRST, VW_PT_DATA.NAME_LAST, PT_ADMISSION.PHYSICIAN_ID1, PT_ADMISSION.PHYSICIAN_ID2, PT_ADMISSION.REFERRAL_SOURCE, PT_ADMISSION.PROSPECT_ADMIT_DATE, PT_ADMISSION.PROSPECT_TERM_DATE, PT_STATUS.STATUS_CODE, VW_RESOURCES.NAME_FIRST, VW_RESOURCES.NAME_LAST, PT_STATUS.CREATE_DATE, VW_RESOURCES.ORGANIZATION_NAME, VW_RESOURCES_2.NAME_FIRST, VW_RESOURCES_2.NAME_LAST, O_TEAM.TEAM_DESCRIPTION, VW_PT_DATA.DATE_OF_BIRTH, A_DEMOGRAPHIC.DESCRIPTION, PT_PAY_SOURCE.INSURANCE_CODE, PT_ADMISSION.FIRST_CERTIFICATION_DATE, PT_STATUS.ADMISSION_ID, O_BRANCH.BRANCH_NAME, PT_STATUS.STATUS_DATEORDER BY O_TEAM.TEAM_DESCRIPTION, 28, VW_PT_DATA.NAME_LAST, VW_PT_DATA.NAME_FIRSTGO-- =============================================-- Example to execute the stored procedure-- =============================================EXECUTE dbo.usp_IHC_Report_Hospice_ReferralsLogEXECUTE dbo.usp_IHC_Report_Hospice_ReferralsLog '20090701','20090731'EXECUTE dbo.usp_IHC_Report_Hospice_ReferralsLog '07/01/2009','07/31/2009'GOI am sure this is just something simple. Hopefully I can overcome this shortly. Thank you.Duane