2002：  2**31-1=2147483647 所以几百个应该没问题。

多谢啊，SAS好强大！

•In operating environments with a 32-bit long integer, the maximum number is 2**31-1 or approximately two billion observations.
•In operating environments with a 64-bit long integer, the number is 2**63-1 or approximately 9.2 quintillion observations.

http://support.sas.com/kb/36112