All Questions
Tagged with sqldatabase-design
132 questions
2votes
1answer
583views
One and only one vs One in crow's foot notation
Am I using one and only one correctly? I have read so many articles online on differences between one and only one vs one and I'm still confused. I.e. a customer can exist with zero, 1 or many (...
- 29
0votes
1answer
100views
Database structure for two-step registration flow
I'm trying to design a database for supporting a multi-step registration flow. The registration flow goes like this: the user logs in via OAuth (which creates a session and user), then they're asked ...
2votes
3answers
765views
Dynamically transform EAV data into standard SQL table
I use MariaDB to store data using EAV model. I need EAV, because each attribute of each entity can have its own validity (validFrom, validTo). For example, I have entity person and I track changes ...
- 277
0votes
3answers
109views
How to avoid data corruption with dual parent/child foreign keys
Imagine the following: Persons table: (Id, FirstName, LastName) PersonEmails table: (Id, PersonId, Address) (to allow a person to have multiple emails) Contacts table: (Id, PersonId, UnsubscribeAll) (...
- 175
-2votes
1answer
727views
Adding new column(s) to DB Table breaks existing queries [closed]
Dilemma: I am working in microservices (MS) architecture for a product with shared (PostgreSQL) DB between MSes and DB Views exposed as Data Access API between SW Components, written and maintained by ...
- 107
1vote
1answer
5kviews
SQL or NoSQL Database for a chat application?
currently I am working on a kind of "Chat" Application. The app consists of "threads". Each of this threads consist of "subthreads" in wich a user can send a message (...
- 65
2votes
2answers
368views
How to store queryable 10-100MB BLOBs?
I have read several discussions about storing BLOBs in the database vs in an object storage. What I need in addition though is a functionality for querying these BLOBs. The BLOBs will be immutable ...
1vote
1answer
281views
SQL - store "like" counts as separate column or infer from a query?
Say I have a feature in a web app where users can create a post and like it. In the frontend the user should see the number of likes a post has. I could store the data two ways: 1. Option 1: A small ...
13votes
10answers
9kviews
Is there any benefit to a separate table that is one-to-one with the primary data table?
I've inherited a system with an Oracle relational database with a couple of tables modeled like I've sketched below, where there's an entire child table that only stores a single status code in a one-...
- 386
1vote
0answers
147views
Efficient way to implement hierarchical inheritance in SQL?
I am working in a database that has a hierarchy of Companies (From location-level all the way up to Top-level parent company). I am designing a system within that to provide a "subscription" ...
18votes
3answers
9kviews
Are surrogate keys a known anti-pattern?
My workplace's database has a pattern that I've not seen before. Every column that is intended to be a key, whether primary or foreign, ends in _SK. This is shorthand for "surrogate key". It ...
- 1,007
-3votes
1answer
124views
Where should linking tables be stored? [closed]
I have a system where properties can be stored, and linked with multiple other entities (each with their own schema). Let's say that Documents can be linked with Users and Assets. What is the best ...
- 191
-1votes
2answers
221views
Difficulty understanding how denormalization results in more storage necessary
I am having difficulty understanding how denormalization results in more storage necessary. For example, let's say that in a normalized relation, there's Table 1 and Table 2. In order to join Table 1 ...
- 153
1vote
3answers
2kviews
Storing count of child rows in parent table
I have two tables, parent and child. Parents can "have" multiple children—in our case they are related through a third table, parent_child_mapping rather than the child storing its parent id ...
-2votes
1answer
115views
Should cached data be kept separate from primary tables?
I have a table in an SQL database for storing information about some business object that looks something like this (details changed so as not to give away what company I work for): CREATE TABLE ...
- 337
