在数据仓之间复制
现在你可以通过复制一个现有的数据仓来创建一个新的数据仓.
创建一个数据仓并填充它.
In[1]:=
original =
CreateDatabin[<|
"Interpretation" -> <|"name" -> "String",
"email" -> "EmailAddress"|>|>];
DatabinUpload[original, {<|"name" -> "Jon Doe",
"email" -> "jondoe@example.com"|>, <|"name" -> "Jane Doe",
"email" -> "janedoe@example.com"|>, <|"name" -> "Bob Sanders",
"email" -> "bob@example.com"|>, <|"name" -> "Bradley Ashford",
"email" -> "brash@example.com"|>, <|"name" -> "Alexandra Bull",
"email" -> "lexi@example.com"|>, <|"name" -> "Woody Codard",
"email" -> "wood@example.com"|>}]Out[1]=
通过复制原有的数据仓来创建一个新的数据仓.
In[2]:=
copy = CopyDatabin[original]Out[2]=
添加数据到复制本.
In[3]:=
DatabinAdd[copy, <|"name" -> "Ralph Waldo",
"email" -> "ralphw@example.com"|>]
DatabinAdd[copy, <|"name" -> "George Bernard",
"email" -> "georgeb@example.com"|>]Out[3]=
Out[3]=
现在新数据仓比原来的有更多的条目.
In[4]:=
{original["EntryCount"], copy["EntryCount"]}Out[4]=
In[5]:=
Complement[copy["Entries"], original["Entries"]]Out[5]=
