Interleaving SAS Data Sets

Learning More

Indexes: You do not need to sort unordered data sets before interleaving them if the data sets have an index on the variable or variables by which you want to interleave. For more information about indexes, see SAS Language Reference: Concepts and the Base SAS Procedures Guide.
Interleaving data sets: For information about interleaving data sets when they contain different variables or when the same variables have different attributes, see Concatenating SAS Data Sets. The same rules apply to interleaving data sets as to concatenating them.
SORT procedure and the BY statement: See Working with Grouped or Sorted Observations.