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spirgel 2016-04-02 16:49:10 -04:00
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relational-data.Rmd
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@ -62,8 +62,8 @@ This diagram is a little overwhelming, and even so it's simple compared to some
For nycflights13: For nycflights13:
* `flights` connects to `planes` via single variable, `tailnum`. `flights` * `flights` connects to `planes` via a single variable, `tailnum`. `flights`
connect `airlines` with the `carrier` variable. connects to `airlines` with the `carrier` variable.
* `flights` connects to `airports` in two ways: via the `origin` or the * `flights` connects to `airports` in two ways: via the `origin` or the
`dest`. `dest`.