mysql workbench建表時的欄位選項含義

[intrinsic column flags] (基本欄位類型標識)

- PK: primary key (column is part of a pk) 主鍵- 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 used data type] 擴充資料類型標記  - BIN: binary (if dt is a blob or similar, this indicates that is binary data, rather than text) 二進位(比text更大的位元據)- UN: unsigned (for integer types, see docs: “10.2. Numeric Types”) 整數

- ZF: zero fill (rather a display related flag, see docs: “10.2. Numeric Types”)值中最有意義的位元組總為0，並且不儲存。