Joining tables based on different column names

Question

I was watching a video[1] by Greg Reda about Pandas to see what Pandas can do how it compares with data.table. I was surprised to learn how difficult it was to join tables in d

Answer 1

Update: All the features listed below are implemented and is available in the current stable version of data.table v1.9.6 on CRAN.

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There are at least these improvements possible for joins in data.tables.

• merge.data.table gaining by.x and by.y arguments

• Using secondary keys to join using both forms discussed above without need to set keys, but rather by specifying columns on x and i.

The simplest reason is that we've not managed to get to it yet.