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下面是解釋查詢有問題..如何說服這個MYSQL查詢使用索引?
mysql> EXPLAIN SELECT orders_0.id, orders_0.created_at, orders_0.total_amount, orders_0.delivery_date, orders_0.customer_id, orders_0.items_summary, orders_0.site_id, orders_0.depot_id, orders_0.region_id, addresses_0.country, orders_0.payment_status, orders_0.created_by, orders_0.status, orders_0.delivered_by
-> FROM production.addresses addresses_0, production.orders orders_0
-> WHERE orders_0.delivery_address_id = addresses_0.id AND ((orders_0.status Not In ('cancelled','checkout','expired')) AND (orders_0.delivery_date>{d '2011-10-31'}));
+----+-------------+-------------+--------+------------------------------------------+---------+---------+-----------------------------------------------+--------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------------+--------+------------------------------------------+---------+---------+-----------------------------------------------+--------+-------------+
| 1 | SIMPLE | orders_0 | ALL | status,delivery_date,delivery_address_id | NULL | NULL | NULL | 929330 | Using where |
| 1 | SIMPLE | addresses_0 | eq_ref | PRIMARY | PRIMARY | 4 | production.orders_0.delivery_address_id | 1 | |
+----+-------------+-------------+--------+------------------------------------------+---------+---------+-----------------------------------------------+--------+-------------+
2 rows in set (0.00 sec)
mysql>
我有它試圖做到哪裏的條件,但遺憾的是它沒有試圖使用索引合併對三列的索引。是創建多列索引的唯一選擇,還是有一些使用這些索引關閉MYSQL的東西?
您是否嘗試了FORCE/USE INDEX,如此處所述。 http://dev.mysql.com/doc/refman/5.1/en/index-hints.html – user1027167 2012-02-28 14:55:58
對帖子標題爲+1 – perissf 2012-02-28 14:57:05
在3列上創建多列索引,並按照它們在查詢 – Abhay 2012-02-28 15:06:18