DATATABLE
StaticTable1 = DATATABLE("IntCol",INTEGER,"StringCol",STRING,{{1,"User1"},{2,"User2"}})
The above expression generates a table with two columns IntCol and StringCol:

UNION
StaticTable2 = UNION ( ROW ( "IntCol",1, "StringCol", "User1"), ROW ( "IntCol",2, "StringCol", "User2") )
The above expression generates a table with same structure:

CALENDAR
StaticTable3 = CALENDAR(date(2018,05,20),TODAY())
This expression generates a table with one column as the following screenshot shows:
