MySQL Workbench- 表列属性含义

建表后,插入列,如下图

属性中,代表含义如下:

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

BIN: binary (if dt is a blob or similar, this indicates that is binary data, rather than text) 二进制(比text更大的二进制数据)

存放二进制数据的列

UN: unsigned (for integer types, see docs: “10.2. Numeric Types”) 整数

无符号数据类型(需要整数形数据)

ZF: zero fill (rather a display related flag, see docs: “10.2. Numeric Types”)值中最有意义的字节总为0,并且不保存。  

填充0位(例如指定3位小数,整数18就会变成18.000)

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



参考:

http://www.2cto.com/database/201209/152244.html

http://my.oschina.net/cers/blog/292191

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