SQL按照年月日生成流水号

declare   @Year   Int ,
         @Month   int ,
         @Day   int ,
         @Temp_No   varchar ( 12 ),
         @NeedNo   varchar ( 4 ),
     @No   varchar ( 20 ),
     @Number   varchar ( 50 ),
     @RandNo   varchar ( 50 ),
     @Nu   varchar ( 10 )
   select   @year = Year ( GetDate ())
   select   @Month = Month ( GetDate ())
   select   @Day = Day ( GetDate ())
   select   @No = Str ( @Year , 4 , 0 ) +
                ( select
                  case
                   when   @Month >= 10   then   Str ( @Month , 2 , 0 )
                   when   @Month < 10   Then   ' 0 ' + Str ( @Month , 1 , 0 )
                 end ) +
                ( select
                  case
                   when   @Day >= 10   then   Str ( @Day , 2 , 0 )
                   when   @Day < 10   Then   ' 0 ' + Str ( @Day , 1 , 0 )
                  end )
select   @Number   = Idd  from  lsh
select   @Nu = count ( * )  from  lsh
if   @Nu   = ' 0 '  
BEGIN
select   @No = @No + ' 0001 '
END
else
BEGIN
      SELECT   @RandNo   =   STR ( CONVERT ( int ,( SUBSTRING ( @Number  , 9 , 4 )) + 1 ), 4 , 0 )
      SELECT   @RandNo   =   REPLACE (  @RandNo , '   ' , ' 0 ' )
      SELECT   @No   =   @No   +   @RandNo
END
insert   into  lsh(Idd)  values ( @No )
select   *   from  lsh