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When you want to enter a set-type constant in an expression, you must give a
set constructor. In essence this is the same thing as when you define a set
type, only you have no identifier to identify the set with.
A set constructor is a comma separated list of expressions, enclosed in
square brackets.
Set constructors
All set groups and set elements must be of the same ordinal type.
The empty set is denoted by [], and it can be assigned to any type of
set. A set group with a range [A..Z] makes all values in the range a
set element. If the first range specifier has a bigger ordinal value than
the second the set is empty, e.g., [Z..A] denotes an empty set.
The following are valid set constructors:
[today,tomorrow]
[Monday..Friday,Sunday]
[ 2, 3*2, 6*2, 9*2 ]
['A'..'Z','a'..'z','0'..'9']
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1999-06-10