嵌套在Nest Json模型中的SQL表

Question

这是json的一个例子。以前，我能够解决不作为嵌套的附件和标签以及作为感应列的问题。任何帮助都是深深的帮助！

factorial

Answer 1

你可以这样做：

case class students(name: String, age: Int, branch: String, sem: String)

val listStudents = List(students("Rajesh",21,"branch1","sem1"),
    students("Kamal",25,"branch2","sem2"),students("Kavitha",23,"branch3","sem3"))

val filteredNames = listStudents.filter(_.branch == "branch2").map(_.name)

注意：第二个参数In [1]: fn = r'D:\temp\.data\40454898.json' In [2]: with open(fn) as f: ...: data = json.load(f) ...: In [14]: t = pd.io.json.json_normalize(data['Volumes'], ...: ['Attachments','Tags'], ...: [['Attachments', 'VolumeId'], ...: ['Attachments', 'InstanceId']]) ...: In [15]: t Out[15]: Key Value Attachments.InstanceId Attachments.VolumeId 0 Name DBJanitor-Private i-1234567890abcdef0 vol-049df61146c4d7901 1 Owner DBJanitor i-1234567890abcdef0 vol-049df61146c4d7901 2 Product Database i-1234567890abcdef0 vol-049df61146c4d7901 3 Portfolio DB Janitor i-1234567890abcdef0 vol-049df61146c4d7901 4 Service DB Service i-1234567890abcdef0 vol-049df61146c4d7901 是我们的嵌套记录（['Attachments','Tags']）的路径，第三个参数data['Values']->Attachments->Tags是外部元数据的路径（{ {1}}，[['Attachments', 'VolumeId'], ['Attachments', 'InstanceId']]）