sql server建表语句带字段说明（SqlServer给表增加多个字段的语法）

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