expression

An expression is the composite of any number of values, variables, column names, operators, and functions that evaluates to a certain value. The resultant value can be one of the simple 1010data types, such as integer, decimal, or text; or it can be one of the complex types, such as package, list-value, or model.

An expression is similar to a formula in Microsoft Excel.

Expressions may contain various operators (e.g., +) and functions (e.g., min(X;Y)) and may refer to column names (e.g., price) as well as explicit values (e.g., 1.01). They may also contain certain predefined variables (e.g., i_).