Mysql query with loop - mysql

Question

I have this query, works fine for view and csv export from phpmyadmin.
Is possible create a loop without repeat? thanks!
SELECT
id, date, name,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, '-', 1), '(', -1) AS op,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, '-', 4), '-', -3) AS dt,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, ')', 1), '-', -1) AS hour,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, '(', 2), '-', -1) AS note
FROM center
WHERE center.date BETWEEN '2019-08-01 00:00:00' AND '2019-12-31 00:00:00'
and message!= ''
HAVING op = 'op1' OR op = 'op2'
UNION SELECT
id, date, name,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, '-', 6), '(', -1) AS op,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, '-', 9), '-', -3) AS dt,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, ')', 2), '-', -1) AS hour,
SUBSTRING_INDEX(SUBSTRING_INDEX(message, '(', 3), '-', -1) AS note
FROM center
WHERE center.date BETWEEN '2019-08-01 00:00:00' AND '2019-12-31 00:00:00'
and message!= ''
HAVING op = 'op1' OR op = 'op2'
UNION SELECT.... more

Answer 1

You can test this Query. It split a max. of 10 pieces from a row.
SELECT `id`,`date`,`name`,CONCAT('op',`op`) as op,`dt`,`hour`,`note`
,subid,cols -- only for test. you can remove this line
FROM (
SELECT c.id,c.date,c.name,
cnt.*,
-- count the pieces in one row
(LENGTH(message)-LENGTH(replace(message,'(op','')))/3 as cols,
-- Split String in piece and store in #content
#content := SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(' (op ',c.message,' (op'), ' (op', subid+3), ' (op', -1)
, SUBSTRING_INDEX(#content, ' - ',1) as op
, SUBSTRING_INDEX( SUBSTRING_INDEX(#content, ' - ',2), ' - ',-1) as dt
, TRIM( TRAILING ')' FROM SUBSTRING_INDEX( SUBSTRING_INDEX(#content, ' - ',3), ' - ',-1)) as hour
, SUBSTRING_INDEX( SUBSTRING_INDEX(#content, ' - ',4), ' - ',-1) as note
FROM center c
CROSS JOIN (
SELECT 0 as subid 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
) as cnt
) as result
WHERE
subid < cols
AND `date` BETWEEN '2019-01-01 00:00:00' AND '2019-12-31 00:00:00'
AND op in (1,2)
ORDER BY id,subid,cols;
Here is a Sample : http://www.sqlfiddle.com/#!9/8bc3b4/60