mysql workbench 建表时 PK,NN,UQ,BIN,UN,ZF,AI解释
mysql workbench 建表时
- 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 - 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) 二进制(比text更大的二进制数据) - UN: unsigned (for integer types, see docs: “10.2. Numeric Types”) 整数 - 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。
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