SAS的SQL过程（SQL Procedure in SAS）（一）

SAS中的SQL过程或许是最强大的数据操作工具。以下是关于SQL过程的一些资源。

A nice SAS SQL basics notes with examples
Top 10 SAS SQL examples:
http://www2.sas.com/proceedings/sugi29/042-29.pdf
A great simple SAS SQL teaching document
http://www.pauldickman.com/teaching/sas/proc_sql_code_20041026.pdf
A nice article about INTO Clause
http://www.ats.ucla.edu/stat/sas/library/nesug98/p193.pdf
Undocumented and Hard to find SQL Features
http://www2.sas.com/proceedings/sugi28/019-28.pdf