step and also when you create a new variable in a dataset.

Sure enough, the SAS update statement is several orders of magnitude faster when updating roughly 5,000 rows from one table to a 100,000 row table.

Informats tell SAS how to read data, while formats tell SAS how to write (or print) data.

This tutorial shows how to use informats and formats to correctly read in data, as well as change how printed data is displayed to the user.

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The SET statement in the DATA step allows you to read a SAS data set so you can add new variables, create a subset, or otherwise modify the data set.