Merging SAS Data Sets

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Indexes: If a data set has an index on the variable or variables named in the BY statement that accompanies the MERGE statement, then you do not need to sort that data set. For more information about indexes, see SAS Language Reference: Concepts and the Base SAS Procedures Guide.
SAS date and time formats and informats: The examples in this section read Time as a character variable, and they read Date with a SAS date informat. You could read Time using special SAS time informats. For more information about SAS date and time formats and informats, see SAS Language Reference: Dictionary.