给现在字段设置默认值
Sql server添加约束
ALTER TABLE book ADD DEFAULT ‘‘ FOR book_vcgjissn
Access直接修改
alter table book alter book_vcgjissn varchar(30) default ‘‘
标签：alter 约束 arch varchar efault arc serve pos for
ALTER TABLE book ADD DEFAULT ‘‘ FOR book_vcgjissn
alter table book alter book_vcgjissn varchar(30) default ‘‘
标签：alter 约束 arch varchar efault arc serve pos for
原文地址：https://www.cnblogs.com/jspdelphi/p/8194084.html
