update zh-cn/application-dev/database/database-relational-guidelines.md.

Signed-off-by: N @ge-yafang <geyafang@huawei.com>

update zh-cn/application-dev/database/database-relational-guidelines.md.
Signed-off-by: N @ge-yafang <geyafang@huawei.com>
038f9005 · 葛亚芳 · Gitee · 17df3672 · 038f9005
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    let tableName = rdbStore.obtainDistributedTableName(deviceId, "test");
    let resultSet = rdbStore.querySql("SELECT * FROM " + tableName)
    ```
+## 相关实例
+针对关系型数据库开发，有以下相关实例可供参考：
+- [`Rdb`：关系型数据库（eTS）（API8）](https://gitee.com/openharmony/app_samples/blob/master/data/Rdb)