mysql workbench创建表时columns中
PK: primary key (column is part of a pk) 主关键字
NN: not null (column is nullable) 不能为空
BIN: binary (if dt is a blob or similar, this indicates that is binary data, rather than text) 二进制
UQ: unique (column is part of a unique key) 唯一的
UN: unsigned (for integer types, see docs: “10.2. Numeric Types”)
ZF: zero fill (rather a display related flag, see docs: “10.2. Numeric Types”)
AI: auto increment (the column is auto incremented when rows are inserted) 自动加数
PK: primary key (column is part of a pk) 主关键字
NN: not null (column is nullable) 不能为空
BIN: binary (if dt is a blob or similar, this indicates that is binary data, rather than text) 二进制
UQ: unique (column is part of a unique key) 唯一的
UN: unsigned (for integer types, see docs: “10.2. Numeric Types”)
ZF: zero fill (rather a display related flag, see docs: “10.2. Numeric Types”)
AI: auto increment (the column is auto incremented when rows are inserted) 自动加数
