MySQL Workbench建表時PK, NN, UQ, BIN, UN...的意思
2015.09.10 | 649閱讀 | 0條評論 | 數(shù)據(jù)庫
- - PK: primary key (column is part of a pk) ?主關(guān)鍵字
- - NN: not null (column is nullable) ? 不能為空
- - UQ: unique (column is part of a unique key) ? ??唯一的
- - AI: auto increment (the column is auto incremented when rows are inserted) ??自動加數(shù)
- [additional data type flags, depend on used data type]
- - BIN: binary (if dt is a blob or similar, this indicates that is binary data, rather than text) ? 二進制
- - 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”)
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