mysql solves the problem of finding records where two or more fields are NULL

/*--------------------------------
Find records t1 where two or more fields are NULL:
id, id1, id2, id3, id4, id5, id6
In the t1 table there is a field;
Where id is the primary key;
How to print the record ids where one or more of the fields are NULL?
In addition, what is the most convenient way to read records one by one in sequence during the storage process?
Note: The primary key id has no order and may also be a string;
-----------------------------------------*/
drop table if exists t1;
create table t1(id int,id1 int,id2 int,id3 int,id4 int,id5 int,id6 int);
insert t1 select
1,1,1,1,1,null,null union all select 
2,null,null,null,1,2,3 union all select 
3,1,2,3,4,5,6 union all select 
4,1,2,3,4,5,null union all select 
5,null,3,4,null,null,null ;
delimiter $$
create procedure usp_c_null()
begin 
declare n_c int;
declare idd int;
declare cur cursor for 
select id,case char_length(concat(ifnull(id1,'@'),ifnull(id2,'@'),ifnull(id3,'@'),ifnull(id4,'@'),ifnull(id5,'@'),ifnull(id6,'@')))
- char_length(replace(concat(ifnull(id1,'@'),ifnull(id2,'@'),ifnull(id3,'@'),ifnull(id4,'@'),ifnull(id5,'@'),ifnull(id6,'@')),'@','') )
 when 6 then 6 when 5 then 5 when 4 then 4 when 3 then 3 when 2 then 2 when 1 then 1 else 0 end as c from t1;
declare exit HANDLER for not found close cur ;
open cur;
repeat 
fetch cur into idd,n_c;
if(n_c>=2) then
select * from t1 where id=idd;
end if ;
until 0 end repeat;
close cur;
end ;
$$
delimiter ;
/*
+------+------+------+------+------+------+------+
| id | id1 | id2 | id3 | id4 | id5 | id6 |
+------+------+------+------+------+------+------+
| 1 | 1 | 1 | 1 | 1 | NULL | NULL |
+------+------+------+------+------+------+------+
1 row in set (0.10 sec)
+------+------+------+------+------+------+------+
| id | id1 | id2 | id3 | id4 | id5 | id6 |
+------+------+------+------+------+------+------+
| 2 | NULL | NULL | NULL | 1 | 2 | 3 |
+------+------+------+------+------+------+------+
1 row in set (0.14 sec)
+------+------+------+------+------+------+------+
| id | id1 | id2 | id3 | id4 | id5 | id6 |
+------+------+------+------+------+------+------+
| 5 | NULL | 3 | 4 | NULL | NULL | NULL |
+------+------+------+------+------+------+------+
1 row in set (0.17 sec)
*/