更新当前债务的存储过程

如何解决更新当前债务的存储过程

CREATE TABLE dbo.Debt 
(Person varchar(100),Total int,LastPaid datetime)

INSERT dbo.Debt 
VALUES ('John Pearson',22500,'3 Mar 2008 23:17'),('Peterson Lance',13500,'22 Feb 2010 10:16'),('Kenny Roger',35100,'21 May 2003 11:18'),('Mavricks Town',17530,'12 Apr 2008 20:33'),('Donny Delft',50100,'15 Jun 2011 19:43'),('Ann Patty',8100,'16 Dec 2012 12:53'),('Victor Roy',12100,'9 Nov 2013 13:33'),('Dayne Ted',26100,'3 Oct 2014 11:32')

需要一个存储过程来只更新高于当前值的值。一个债务人不能多次出现在列表中，如果他们的债务增加，那么它应该触发应该更新另一个表更新债务和移动。

我的查询工作正常，但需要更新运动：

ALTER PROCEDURE [dbo].[DebtList]
(
  @Fname as nvarchar(20),@Debt as int
)

AS
BEGIN

IF EXISTS
(SELECT * from [Debts] 
 WHERE [Person]=@Fname
 AND [Total]<=@Debt)
UPDATE [Debts]
   SET [Person] = @Fname,[Total] = @Debt,[LastPaid] = getdate()
 WHERE [Person]=@Fname
ELSE IF not EXISTS
(SELECT * from [Debts] 
 WHERE [Person] in (Select [Person] from [Debts] where Person=@Fname))
INSERT INTO  [Debts]
           ([Person],[Total],[LastPaid])
     VALUES
           (@Fname,@Debt,getdate())
END