如何在我的SQL选择中实现IF ELSE语句

Question

kindly assist me on how to implement the code below since am getting this error

" Incorrect syntax near '{'. Incorrect syntax near the keyword 'AND'. Incorrect syntax near '}'"

      IF 
      TreatmentGroup=ALL
      {
      SELECT
      TreatmentItems.TreatmentGroup As TreatmentGroup,
      MedicalSchemeDetail.*
      FROM
      MedicalSchemeDetail JOIN TreatmentItems ON
      MedicalSchemeDetail.CompanyID = TreatmentItems.CompanyID AND 
      MedicalSchemeDetail.BranchID = TreatmentItems.BranchID AND 
      MedicalSchemeDetail.DepartmentID = TreatmentItems.DepartmentID AND
      MedicalSchemeDetail.ItemID = TreatmentItems.TreatmentID 
      WHERE
      AND MedicalSchemeDetail.CompanyID = @CompanyID 
      AND MedicalSchemeDetail.BranchID = @BranchID 
      AND MedicalSchemeDetail.DepartmentID = @DepartmentID 
      AND MedicalSchemeDetail.MedicalSchemeID = @MedicalSchemeID 
      AND IsNull(MedicalSchemeDetail.Excluded,0) = 0
      }
      ELSE
      {
      SELECT
      TreatmentItems.TreatmentGroup As TreatmentGroup,
      MedicalSchemeDetail.*
      FROM
      MedicalSchemeDetail JOIN TreatmentItems ON
      MedicalSchemeDetail.CompanyID = TreatmentItems.CompanyID AND 
      MedicalSchemeDetail.BranchID = TreatmentItems.BranchID AND 
      MedicalSchemeDetail.DepartmentID = TreatmentItems.DepartmentID AND
      MedicalSchemeDetail.ItemID = TreatmentItems.TreatmentID 
      WHERE
      TreatmentGroup=@TreatmentGroup
      AND MedicalSchemeDetail.CompanyID = @CompanyID 
      AND MedicalSchemeDetail.BranchID = @BranchID 
      AND MedicalSchemeDetail.DepartmentID = @DepartmentID 
      AND MedicalSchemeDetail.MedicalSchemeID = @MedicalSchemeID 
      AND IsNull(MedicalSchemeDetail.Excluded,0) = 0
      }

Answer 1

您需要在查询的第一个WHERE之后删除AND