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We have a situation in a database design in our company. We are trying to figure out the best way to design the database to store transactional data. I need expert’s advice on the best relational design to achieve it. Problem: We have different kind of “Entities” in our system, for example; Customers, Services, Dealers etc. These Entities are doing transfer of funds between each other. We need to store the history of the transfers in database.

Solutions:

  1. One table of transfers and another table to keep “Accounts” information. There are three tables “Customers”, “Services”, “Dealers”. There is another table “Accounts”. An account can be related to any of the “Entities” mentioned above; it means (and that’s the requirement) that logically there should be a one-to-one relationship to/from Entities and Accounts. However, we can only store the Account_ID in the Entities table, but we cannot store the foreign key of Entities in Accounts table. Here the problem happens in terms of database design. Because if there is a customer’s account, it is not restricted by the database design to not be stored in Services table etc. Now we can keep all transfers in one table only since Accounts are unified among all the entities.

  2. Keep the balance information in the table primary Entities table and separate tables for all transfers. Here for all kind of transfers between the entities, we are keeping separate tables. For example, a transfer between a Customer and Service provider will be stored in a table called “Spending”. Another table will have transfer data for transfer between Service and Dealers called “Commission” etc. In this case, we are not storing all the transfers of the funds in a single table, but the foreign keys are properly defined since the tables “Spending” and “Commission” are only between two specific entities.

According to the best practices, which one of the above given solutions is correct, and why?

put on hold as off-topic by mustaccio, marcello miorelli, McNets, kevinsky, MDCCL Jul 16 at 17:50

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    I'm voting to close this question as off-topic because it already has an accepted answer elsewhere – mustaccio Jul 15 at 23:59
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Repeat resp from: https://stackoverflow.com/questions/38941199/complicated-database-design

You can make table Accounts with three fields with FK to Customers,Dealers and Services and it's will close problem. But also you can make three table for each type of entity with accounting data. You have the deal with multi-system case in system design. Each system solve the task. But for deсision you need make pros and con analyses about algorithm complexity, performance and other system requirements. For example one table will be more simple to code, but three table give more performance of sql database.

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