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_
).