I am reading a PROC SQL tutorial and got stuck up in these following lines -
" When processing a set operation that displays only unique rows (a set operation that contains the set operator EXCEPT, INTERSECT, or UNION), PROC SQL makes two passes through the data, by default. For set operations that display both unique and duplicate rows, only one pass through the data is required "
So what does it mean by the term "Pass through the data" ? Any relevant link or explanation or even brief clue will be highly appreciated.
It means that the dataset will be read twice, causing more I/O and costing more time.
It means that the dataset will be read twice, causing more I/O and costing more time.
Join us for SAS Innovate April 16-19 at the Aria in Las Vegas. Bring the team and save big with our group pricing for a limited time only.
Pre-conference courses and tutorials are filling up fast and are always a sellout. Register today to reserve your seat.
Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.