{ column datatype [DEFAULT expr] 
  [ inline_constraint [inline_constraint]... | inline_ref_constraint ]
| { out_of_line_constraint | out_of_line_ref_constraint | supplemental_logging_props }
} 
[, { column datatype [DEFAULT expr] 
  [ inline_constraint [inline_constraint]... | inline_ref_constraint ]
| { out_of_line_constraint | out_of_line_ref_constraint | supplemental_logging_props }
]...