Můžete to udělat přidáním ORDER BY start_time ASC
ve vaší GROUP_CONCAT
funkce
SET @sql = NULL;
SELECT GROUP_CONCAT(DISTINCT
CONCAT('MAX(CASE WHEN job_id = ''',
job_id,
''' THEN start_time END) `',
job_id,
'_start`',
',',
'MAX(CASE WHEN job_id = ''',
job_id,
''' THEN end_time END) `',
job_id,
'_end`'
)
ORDER BY start_time ASC
)
INTO @sql
FROM t;
SET @sql = CONCAT('SELECT exec_id, ', @sql, '
FROM t
GROUP BY exec_id');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;