Rules for SAS data set names

• Data set names can be 32 characters long.
  
  
• The first character must be a letter (A, B, C, . . ., Z) or underscore (_).
  
  
• Subsequent characters can be letters, numeric digits (0, 1, . . ., 9), or underscores.
  
  
• You can use upper or lowercase letters.
  
  
• Do not use blanks.
  
  
• Do not use the following reserved names:
  • _NULL_
  • _DATA_
  • _LAST_