Workbench使用筆記

1、建立表

- 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) 惟一

- AI: auto increment (the column is auto incremented when rows are inserted) 自增

- BIN: binary (if dt is a blob or similar, this indicates that is binary data, rather than text) 存放二進制數據的列(比text更大的二進制數據)

- UN: unsigned (for integer types, see docs: 「10.2. Numeric Types」) 無符號數據類型（例如-500 to 500替換成0 - 1000,須要整數形數據）

- ZF: zero fill (rather a display related flag, see docs: 「10.2. Numeric Types」)值中最有意義的字節總爲0，而且不保存。 

- G  :Generated column 基於其餘列的公式生成值的列