9.2.4 单一字段(Single Key Column)或复合字段(Composite Key Columns)索引 458 9.2.5 唯一键(Unique Key)或非唯一键(Non-Unique Key)索引 467
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These annotations are used to define the composite key columns: "STREET" and "CITY" respectively.
这些注释用于定义组合键列：分别是“STREET”和“CITY”。
The composite key defined in listings 1 and 2 allows you to bundle a number of columns together.
清单1和清单2中定义的组合键允许您将多个列绑定在一起。
A composite key is a key made up of multiple columns.
复合键就是由多个列组成的键。
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