SQL row column sum with spaces between numbers - mysql

Question

mysql table:
table_results:
id results
1 1 0 1 2 4 5
2 5 4 2 6
3 7 2 8 2 4
I'm creating a Yii gridview I need to
SELECT SUM(results) AS results2 FROM table_results WHERE id = 1:
for example I have to sum first row: 1+0+1+2+4+5 and make as results2 which = 15.
How to do that just in sql?

Answer 1

There is no need for dynamic SQL. You can use:
SqlFiddleDemo
SELECT sub.id, SUM(sub.val) AS `sum`
FROM
(
SELECT id, SUBSTRING_INDEX(SUBSTRING_INDEX(t.results, ' ', n.n), ' ', -1) AS val
FROM table_results t
CROSS JOIN
(
SELECT a.N + b.N * 10 + 1 n
FROM
(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) a
,(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) b
) n
WHERE n.n <= 1 + (LENGTH(t.results) - LENGTH(REPLACE(t.results, ' ', '')))
) sub
-- WHERE sub.id = 1
GROUP BY sub.id

Answer 2

One way to do this is using dynamic SQL. So, entirely within MySQL:
declare #sql varchar(2000);
select #sql = concat('select ', replace(results, ' ', '+'))
from table_results tr
where id = 1;
prepare s from #sql;
execute s;
deallocate prepare s;
As a note: Just because I answered the question does not mean that I condone the data structure.