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。
A composite foreign key cannot have more than 32 columns.
外键的组合列不能超过32列。
A composite foreign key cannot have more than 32 columns.
外键的组合列不能超过32列。
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