{ ( column datatype [DEFAULT expr] [column_ref_constraint] [column_constraint [column_constraint]...] ) | table_or_view_constraint | table_ref_constraint } [, { ( column datatype [DEFAULT expr] [column_ref_constraint] [column_constraint [column_constraint]...] ) | table_or_view_constraint | table_ref_constraint } ]... alter_column_properties
For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.