我有一个 SQL 语句，它看起来像：
select id, CIDs, COLOR, XT, MP, Name, concat(PIDs,",",GROUP_CONCAT(DISTINCT id)) as PIDs, IFNULL(Name,id) as unqName from (
select id, CIDs, COLOR, XT, MP, Name, concat(PIDs,",",GROUP_CONCAT(DISTINCT id)) as PIDs, IFNULL(MP,id) as unqMP from (
select id, CIDs, COLOR, XT, MP, Name, concat(PIDs,",",GROUP_CONCAT(DISTINCT id)) as PIDs, IFNULL(XT,id) as unqXT from (
select id, CIDs, COLOR, XT, MP, Name, GROUP_CONCAT(DISTINCT id) as PIDs, IFNULL(COLOR,id) as unqCOLOR from Performance group by unqCOLOR
) m group by unqXT
) x group by unqMP
) y group by unqName
我需要修剪性能细节并获取 PID，它可以工作。但是我得到了重复的 PID（4 次），是否有任何性能优化？为了让 SQL 语句更快地执行并且 PID 是唯一的？
mysql> select count(*) from Performance;
+----------+
| count(*) |
+----------+
| 243484 |
+----------+
1 row in set (0.00 sec)
执行的 SQL 语句需要：
Query OK, 137771 rows affected (43.54 sec)
SQLFiddle 链接：