摘要: [intrinsic column flags] (基本字段类型标识)- PK: primary key (column is part of a pk) 主键- NN: not null (column is nullable) 非空- UQ: unique (column is part of a unique key) 唯一- AI: auto increment (the column is auto incremented when rows are inserted) 自增 www.2cto.com [additional data type flags, depend on us 阅读全文
posted @ 2013-04-28 14:32 网络耗子 阅读(573) 评论(0) 推荐(0) 编辑