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The SUM function calculates the sum of the values of the variables with names that match the pattern. The value in each variable must be numeric.
Mask characters are supported for Local variable names in varlist. varlist can contain an asterisk * (that represents any number of characters) or a question mark ? (that represents a single character).
Mask characters are not supported for Database variables in varlist.
Uncommitted Database variables that satisfy the criteria specified are considered (meaning, even though they are not yet committed, they are included in the sum).
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