例子1.
create table profession
(
id int not null identity primary key,
profession varchar(20)
)
insert into profession (profession)
select profession from my_contacts group by profession order by profession
本文转自鹅倌51CTO博客，原文链接： http://blog.51cto.com/kaixinbuliao/881363，如需转载请自行联系原作者
