https://blog.youkuaiyun.com/yameingzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/yameing/article/details/128535470https://blog.youkuaiyun.com/yameing/article/details/128535470yameingTue, 03 Jan 2023 23:45:00 +0800https://blog.youkuaiyun.com/yameing/article/details/128328148https://blog.youkuaiyun.com/yameing/article/details/128328148yameingThu, 15 Dec 2022 23:45:00 +0800https://blog.youkuaiyun.com/yameing/article/details/128327084https://blog.youkuaiyun.com/yameing/article/details/128327084yameingThu, 15 Dec 2022 23:45:00 +0800https://blog.youkuaiyun.com/yameing/article/details/128251849https://blog.youkuaiyun.com/yameing/article/details/128251849yameingThu, 15 Dec 2022 23:45:00 +0800https://blog.youkuaiyun.com/yameing/article/details/128224170https://blog.youkuaiyun.com/yameing/article/details/128224170yameingFri, 09 Dec 2022 23:45:00 +0800https://blog.youkuaiyun.com/yameing/article/details/128214415https://blog.youkuaiyun.com/yameing/article/details/128214415yameingWed, 07 Dec 2022 23:45:00 +0800https://blog.youkuaiyun.com/yameing/article/details/128214077https://blog.youkuaiyun.com/yameing/article/details/128214077yameingWed, 07 Dec 2022 23:45:00 +0800https://blog.youkuaiyun.com/yameing/article/details/39891805https://blog.youkuaiyun.com/yameing/article/details/39891805yameingWed, 08 Oct 2014 12:12:02 +0800https://blog.youkuaiyun.com/yameing/article/details/39696151https://blog.youkuaiyun.com/yameing/article/details/39696151yameingTue, 30 Sep 2014 15:11:46 +0800https://blog.youkuaiyun.com/yameing/article/details/36010829https://blog.youkuaiyun.com/yameing/article/details/36010829yameingMon, 30 Jun 2014 16:41:44 +0800https://blog.youkuaiyun.com/yameing/article/details/36010147https://blog.youkuaiyun.com/yameing/article/details/36010147yameingMon, 30 Jun 2014 16:35:05 +0800https://blog.youkuaiyun.com/yameing/article/details/30065623https://blog.youkuaiyun.com/yameing/article/details/30065623yameingWed, 11 Jun 2014 16:25:49 +0800https://blog.youkuaiyun.com/yameing/article/details/27969143https://blog.youkuaiyun.com/yameing/article/details/27969143yameingMon, 02 Jun 2014 23:09:47 +0800https://blog.youkuaiyun.com/yameing/article/details/22622041https://blog.youkuaiyun.com/yameing/article/details/22622041yameingMon, 31 Mar 2014 00:02:24 +0800https://blog.youkuaiyun.com/yameing/article/details/9834557https://blog.youkuaiyun.com/yameing/article/details/9834557yameingThu, 08 Aug 2013 13:05:39 +0800https://blog.youkuaiyun.com/yameing/article/details/9834543https://blog.youkuaiyun.com/yameing/article/details/9834543yameingThu, 08 Aug 2013 13:03:43 +0800https://blog.youkuaiyun.com/yameing/article/details/9834529https://blog.youkuaiyun.com/yameing/article/details/9834529yameingThu, 08 Aug 2013 13:01:24 +0800https://blog.youkuaiyun.com/yameing/article/details/9402599https://blog.youkuaiyun.com/yameing/article/details/9402599yameingSun, 21 Jul 2013 23:56:46 +0800https://blog.youkuaiyun.com/yameing/article/details/9402591https://blog.youkuaiyun.com/yameing/article/details/9402591yameingSun, 21 Jul 2013 23:56:10 +0800 db.ysq.count() // 执行速度很快 > db.ysq.count({"x" : 1}) // 增加查询条件会使count变慢 ————————————————————————   2、distinct ———————————————————————— ]]>https://blog.youkuaiyun.com/yameing/article/details/8948492https://blog.youkuaiyun.com/yameing/article/details/8948492yameingMon, 20 May 2013 00:25:14 +0800 db.ysq.ensureIndex({"username":1}) ———————————————————————— 　　为了便于区分，将上面的索引称为单键索引，多键索引如下 ————————————————————————]]>