{ column datatype [DEFAULT expr] 
  [column_ref_constraint] [column_constraint [column_constraint]...]
| { table_or_view_constraint | table_ref_constraint | supplemental_logging_props }
} 
[, { column datatype [DEFAULT expr] 
     [column_ref_constraint] [column_constraint [column_constraint]...]
   | { table_or_view_constraint | table_ref_constraint | supplemental_logging_props }
   }
]...

For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.