劍噬天下

摘要： - PK: primary key (column is part of apk) 主键 - NN: not null (column is nullable) 是否为空- UQ: unique (column is part of a uniquekey) 外键- AI: auto increment (the column is autoincremented when rows are inserted) 自动增加- BIN: binary (if dt is a blob or similar, this indicates that is binarydata, rather tha 阅读全文