Certification Summary---Combining SAS Data Sets

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 * You can rename any number of variables in each occurrence of the RENAME=option.


 * In match-merging, the IN=data set option can apply to any data set in the MERGE statement. The RENAME=, DROP=, and KEEP=options can apply to any data set in the DATA or MERGE statements.


 * Use the KEEP=option instead of the DROP=option if more variables are dropped than kept.


 * When you specify multiple data set options for a particular data set, enclose them in a single set of parentheses.