The If - Then - Else construct can be used to make conditional parts in an expression.
Constructs can be "nested", just as long as each "nesting" has a block of matching If, Then and Else.
See wikipedia for more info on this construct.
The Choose construct can be used as an alternative when multiple conditions need to be checked: in many cases the Choose construct will be easier to read and understand.
This function is NOT SQL compatible. For more information about SQL compatibility, see our documentation.
Returns the value after the Then if the condition in the If statement returns true.
If the condition returns false, then the value after Else is returned.