The "substr" function in SAS describes the position, the length and the name of a character variable. In the above syntax, the "substr" will identify the elements of the character variable, and ...

Note: SAS functions used in a WHERE expression that can be optimized by an index are the SUBSTR function and the TRIM function. For more information on SAS functions, see Functions and CALL Routines ...

All arguments in SAS language functions within %SYSFUNC must be separated by commas. You cannot use argument lists preceded by the word OF. Because %SYSFUNC is a macro function, you do not need to ...