Definitions for SAS Expressions
expression
is generally a sequence of operands and operators that form a set of instructions that
are performed to produce a resulting value. You use expressions in SAS program
statements to create variables, assign values, calculate new values, transform
variables, and perform conditional processing. SAS expressions can resolve to
numeric values, character values, or Boolean values.
operands
are constants or variables that can be numeric or character.
operators
are symbols that represent a comparison, arithmetic calculation, or logical operation;
a SAS function; or grouping parentheses.
simple expression
is an expression with no more than one operator. A simple expression can consist of
one of the following single operators:
• constant
• variable
• function
compound expression
is an expression that includes several operators. When SAS encounters a compound
expression, it follows rules to determine the order in which to evaluate each part of
the expression.
WHERE expressions
is a type of SAS expression that is used within a WHERE statement or WHERE=
data set option to specify a condition for selecting observations for processing in a
DATA or PROC step. For syntax and further information about WHERE
expressions, see Chapter 11, “WHERE-Expression Processing,” on page 177.
Examples of SAS Expressions
The following are examples of SAS expressions:
• 3
• x
• x+1
• age<100
• trim(last)||', '||first
92 Chapter 6 • Expressions
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