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| 我们是一家做软件开发 / 数字化系统定制的团队，希望在 V 站接一些项目 外包 • mayunyi • Nov 28, 2025 • Lastly replied by mayunyi | 2 |
| [接项目] - 寻求项目合作 外包 • mayunyi • Nov 26, 2025 • Lastly replied by mayunyi | 2 |
| 收购 pixel 6pro 12g+128G 二手交易 • mayunyi • May 17, 2024 • Lastly replied by beyondgamp | 4 |
| 寻求有关视频处理等相关的朋友一直做产品 外包 • mayunyi • Dec 11, 2023 • Lastly replied by milzero | 1 |
| 关于 nextjs13app 使用 getData 获取数据，打包报错 Next.js • mayunyi • Nov 22, 2023 |
mayunyi's recent replies
在的
Oct 17, 2023 Replied to a topic by 934604562 › 商业模式 › 机械臂集成、工业互联网相关 |
是研发吗
May 23, 2023 Replied to a topic by aqtata › MongoDB › 请教一个查询统计的语句 |
db.collection.aggregate([
{
$group: {
_id: { date: "$date" },
count: { $sum: 1 },
id_count: { $addToSet: "$id" },
name_count: { $addToSet: "$name" }
}
},
{
$project: {
_id: 0,
date: "$_id.date",
count: 1,
id_count: { $size: "$id_count" },
name_count: { $size: "$name_count" }
}
},
{
$sort: { date: 1 }
}
])
{
$group: {
_id: { date: "$date" },
count: { $sum: 1 },
id_count: { $addToSet: "$id" },
name_count: { $addToSet: "$name" }
}
},
{
$project: {
_id: 0,
date: "$_id.date",
count: 1,
id_count: { $size: "$id_count" },
name_count: { $size: "$name_count" }
}
},
{
$sort: { date: 1 }
}
])
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