mongoDB相关笔记

mongoDB连接查询

db.guild_member.aggregate([
	{
		$match: {
			'guild_id':11
		}
	},

	{
	  $lookup: {
		from: "player_data",  // 要连接的表
		localField: "player_id",  
		foreignField: "player_id",
		as: "same_guild"
	  }
	},

	{
	    $project: {
		    '_id': 0,
		    'role_id':'$same_guild.player_id', // 重命名
		    'player_id':'$same_guild.account_id', 
		}
	}
]);