Database Reference
In-Depth Information
How it works…
Let's take a look at this in more detail:
(i/$join [:Indicator-Code :Indicator-Code] chn-1990 chn-2000)
The pair of column keywords in a vector ( [:Indicator-Code :Indicator-Code] ) are the
keys that the datasets will be joined on. In this case, the :Indicator-Code column from
both the datasets is used, but the keys can be different for the two datasets. The irst column
that is listed will be from the irst dataset ( chn-1990 ), and the second column that is listed
will be from the second dataset ( chn-2000 ).
This returns a new dataset. Each row of this new dataset is a superset of the corresponding
rows from the two input datasets.
 
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