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Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more. Please look for better alternatives.

** Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more. Please look for better alternatives. **

  1. union all (keep all rows) vs union (distinct/unique) prefer to use union all union and union all relies on column positions another way is to use proc append which appends data by matching column names

append as advantages over sql union append tries to match column names while sql union relies on the column orders.

be careful when you use append, be sure to remove previous data sets ... as you might run the same piece of code multiple times

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