alter table table_name add column_name +字段类型+ 约束条件

use NatureData
go
alter table XunHu add 
  MaleCount varchar(50) null,
  FemaleCount varchar(50) null,
  SubadultCount varchar(50) null,
  LarvaeCount varchar(50) null,
  TraceType varchar(50) null,
  MountainArea varchar(50) null,
  BehaviourType varchar(50) null,
  Area varchar(50) null,
  Phenology varchar(50) null;
go