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CREATE PROCEDURE [dbo].[PorcedureName]
 -- Add the parameters for the stored procedure here

                 @ColumName1 type,

                 @ColumName2 type,

                 @ColumName3 type,

                 @ColumName4 type
AS
BEGIN
 -- SET NOCOUNT ON added to prevent extra result sets from
 -- interfering with SELECT statements.
 SET NOCOUNT ON;

    -- Insert statements for procedure here
    DECLARE   @X_ColumName1 type,

    DECLARE   @X_ColumName2 type,

    DECLARE   @X_ColumName3 type,

     DECLARE  @X_ColumName4 type

 SELECT    @X_ColumName1=ColumName1

                 @X_ColumName2=ColumName2

                 @@X_ColumName3=ColumName3

                @X_ColumName4=ColumName4

 FROM [dbo].[TableName1]
 WHERE ColumName1= @ColumName1-----search the result by primary key

 IF @@ROWCOUNT = 1  --update
 BEGIN
   SELECT @X_ColumName1=ISNULL(@ColumName1,@X_ColumName1)

   SELECT @X_ColumName2=ISNULL(@ColumName2,@X_ColumName2)

   SELECT @X_ColumName3=ISNULL(@ColumName3,@X_ColumName3)

   SELECT @X_ColumName4=ISNULL(@ColumName4,@X_ColumName4)

  EXEC [dbo].[ProcedureName2(update)]---

@X_ColumName1=ColumName1,@X_ColumName2=ColumName2,@X_ColumName3=ColumName3,@X_ColumName4=ColumName4

---OR other update sql
 END
 ELSE--Insert
 BEGIN
  EXEC [dbo].[ProcedureName3(insert)] @X_ColumName1=ColumName1,@X_ColumName2=ColumName2,@X_ColumName3=ColumName3,@X_ColumName4=ColumName4 END

--Or other insert sql
END