What the component is not

BQL Expression component is not:

A replacement for the Program component. BQL Expression component does not support //remarks and //comments.
A replacement for other BQL statement containers that manipulate data.
Capable of manipulating data through stored variables.
Capable of line-by-line programming.
Capable of handling time functions.

If your requirements exceed what can be achieved using a BQL Expression component, there may come a point when you have to consider using a Program component.