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Update relational-data.Rmd (minor typo) (#641) 

Row 371 : In table=`airports`, the variable representing longitude is not `long` ...it is `lon`
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Mark Beveridge 2018-06-20 10:06:03 +01:00 committed by Hadley Wickham
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relational-data.Rmd
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@ -368,7 +368,7 @@ So far, the pairs of tables have always been joined by a single variable, and th
variables from `x` will be used in the output.
For example, if we want to draw a map we need to combine the flights data
with the airports data which contains the location (`lat` and `long`) of
with the airports data which contains the location (`lat` and `lon`) of
each airport. Each flight has an origin and destination `airport`, so we
need to specify which one we want to join to: