mysql workbench建表時PK,NN,UQ,BIN,UN,ZF,AI含義說明

龐順龍發表於2019-05-10
MySqlAI

mysql workbench建表時PK,NN,UQ,BIN,UN,ZF,AI含義說明 

- 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


[additional data type flags, depend on used data type] 擴充套件資料型別標記

- BIN: binary (if dt is a blob or similar, this indicates that is binary data, rather than text) 二進位制(比text更大的二進位制資料)
- 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。 

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