由于几家银行的合并，数据库数据模型需要进行一些显著的修改。
Because of a merger of several Banks, the database data model requires some significant changes.
了解关系数据库、数据模型、惟一键、主键、外键和表联结。
Learn about relational databases, data models, unique keys, primary keys, foreign keys, and table joins.
要构建后端，首先要为MySQL数据库定义数据模型。
To build out the back end, start with defining the data model for the MySQL database.
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