Importing Data from Multiple Files – 人人为我为人人

> ds = datastore(filename,"Delimiter","-,"TextscanFormats","%D%C%f","SelectedVariableNames",var)

`ds`	Reference to a collection of data.

`filename`	File location.
`"Delimiter","-"`	Delimiter is one or more characters that separate data values in the file.
`"TextscanFormats","%D%C%f"`	Import variables using the output class in the format specification string.
`"SelectedVariableNames",var`	Import only the variables listed in `var`.

Merging Data

Once you read in multiple tables, you may want to join them together. You can join two tables in many ways. The various join functions are listed in the table below.

Function	Example
join `Key1` in `Tright` must have unique values and contain every key in `Tleft`.
innerjoin
outerjoin Two key variables are created.
outerjoin with `"MergeKeys"` on