我认为您想要:

SELECT CONCAT(
    GROUP_CONCAT(
        'SELECT ''', COLUMN_NAME,''' MyColumns, SUM(`', COLUMN_NAME,'`) Total FROM mydb.source_table' 
        SEPARATOR '\n UNION ALL \n'
    ),
    '\nORDER BY Total DESC'
)
INTO @sql
FROM  INFORMATION_SCHEMA.COLUMNS
WHERE 
    TABLE_SCHEMA = 'mydb' 
    AND TABLE_NAME   = 'source_table'
    AND COLUMN_NAME NOT IN ('ID', 'Name');

合理价格:ORDER BY子句应放在所有UNION ALL子查询之后 -因此它必须在GROUP_CONCAT()之外，在外部CONCAT()中.

Rationale: the ORDER BY clause should go after all UNION ALL subqueries - so it needs to be outside of the GROUP_CONCAT(), in an outer CONCAT().

还请注意，您不需要CONCAT() GROUP_CONCAT():MySQL默认已经做到了.

Also please note that you don't need CONCAT() within GROUP_CONCAT(): MySQL does that by default already.