SAS Certification Prep Guide, 4th Edition

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Creating a Macro Variable during DATA Step Execution

When you create or update a macro variable with the %LET statement, all macro processing takes place before the execution of the DATA step. The SYMPUT routine enables you to create or update macro variables during DATA step execution. Depending on how the arguments are coded, you can create either a single macro variable or multiple macro variables. You can use the SYMPUT routine with literal strings to create a macro variable and to assign either an exact name or an exact text value to it. You can use the SYMPUT routine with a DATA step variable to assign the value of that DATA step variable to a macro variable.

You can use the SYMPUTX routine to create or update a macro ...