新增一列：alter table [tbl_name] add column [column_name] [type]

删除一列：alter table [tbl_name] drop [column_name];

修改列名：alter table [tbl_name] rename [column_name] to [column_name_1]; 

修改列类型：alter table [tbl_name] alter COLUMN [column_name] type varchar(255)

重置序列：alter sequence xxx restart with 1

创建序列：create sequence xxx START with 1 INCREMENT by 1 NO MINVALUE NO MAXVALUE CACHE 1

给某一列赋上序列：alter table [tbl_name] alter column [column_name] set default nextval(‘xxx‘)

alter table [tbl_name] add constraint ‘pkey_name‘ ;