84669 person learning
152542 person learning
20005 person learning
5487 person learning
7821 person learning
359900 person learning
3350 person learning
180660 person learning
48569 person learning
18603 person learning
40936 person learning
1549 person learning
1183 person learning
32909 person learning
mysql慢查询语句该如何优化
SELECT * FROM `x_order` LEFT JOIN x_goods ON x_goods.goods_id = x_order.order_goodsid WHERE `order_isdelete` = 0 AND `goods_type` = 0 GROUP BY order_no
人生最曼妙的风景,竟是内心的淡定与从容!
Build an index order_isdelete goods_type order_no goods_id Consider how to build an index to optimize the query for these fields.
Where group by select, try to do it on the index
Try not to use JOIN and migrate functions from SQL to code level processing
Index
Build an index
order_isdelete goods_type order_no goods_id
Consider how to build an index to optimize the query for these fields.
Where group by select, try to do it on the index
Try not to use JOIN and migrate functions from SQL to code level processing
Index