sql 语句
EXPLAIN SELECT COUNT(1)
FROM t_shop_order_bill sob
LEFT JOIN t_order_info oi ON oi.order_no=sob.order_no;
执行后
我的索引
sql 语句
EXPLAIN SELECT COUNT(1)
FROM t_shop_order_bill sob
LEFT JOIN t_order_info oi ON oi.order_no=sob.order_no;
执行后
我的索引