Although SQL is a good choice if you have to do this for only one variable, if you have many variables, PROC STDIZE and PROC FREQ together will be a much better choice than SQL. In SQL, you have to type the formula (turnover > mean(turnover)) as aboveaverage for each variable, so its a lot more typing than PROC STDIZE/PROC FREQ, and a lot more opportunities to make a typographical error or outright mistakes.
I think people should think not of SQL but the appropriate SAS PROCs when they need to do statistics on many variables. I encourage people to learn how to do this without SQL even in the case where there is only one variable; learning how to do this without using SQL is a good habit to get into (in my opinion).
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