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DATABASE-DESIGN QUESTIONS

Multiple values in a column
Multiple values in a column
I wish this helpful for you No, no, no, no, no.This would be a capital violation of the relational database model. Create three tables: Users, Messages, and MessagesSentToUsers.
TAG : database-design
Date : January 02 2021, 06:48 AM , By : Ken
Database scheme design social networking sites
Database scheme design social networking sites
wish help you to fix your issue These are the steps you should follow for initial database design.First, list down all the "objects" you want to store, such as users, posts, relationships and so on.
TAG : database-design
Date : January 02 2021, 06:48 AM , By : Ray
Database Modelling - Conceptually different entities with near identical fields
Database Modelling - Conceptually different entities with near identical fields
This might help you Very often, in the situation you described, the subject being modeled fits a pattern called "generalization specialization". The fact that two prior answers discuss subtypes supports this. An object model tends to deal with gen-sp
TAG : database-design
Date : January 02 2021, 06:48 AM , By : woxorz
Help a CRUD programmer think about an "approval workflow"
Help a CRUD programmer think about an "approval workflow"
seems to work fine There are design patterns for this. Maybe they will help a bit:http://en.wikipedia.org/wiki/Workflow_patterns
TAG : database-design
Date : January 02 2021, 06:48 AM , By : flesk
Why is it considered bad table design to use multiple tables in dynamodb?
Why is it considered bad table design to use multiple tables in dynamodb?
help you fix your problem I would say that this statement about single table was taken out of the context and overhyped recently. No one forces you to use as many tables as you want. You don't pay for the number of tables in DynamoDB, only for data s
TAG : database-design
Date : December 31 2020, 04:56 AM , By : Stephen Dewar
"ORDER BY is only supported when the partition key is restricted by an EQ or an IN." cassandra
"ORDER BY is only supported when the partition key is restricted by an EQ or an IN." cassandra
this will help The error clearly describes the reason for the failure. Your primary key is id and year and then further clustering is done on time key. Cassandra needs to know the id and the year and only then it can do an order by on time.
TAG : database-design
Date : December 31 2020, 03:04 AM , By : Matt Croydon
How to design the database schema?
How to design the database schema?
like below fixes the issue As "A user can have at most one profile" it sounds like you'll benefit by adding a user_profile table which would then be 'subtyped' by broker, seller and buyer, adding additional fields as applicable.A user would have a 1:
TAG : database-design
Date : November 22 2020, 12:01 PM , By : user181345
Database design: confuse on Len Silverston's concept
Database design: confuse on Len Silverston's concept
it fixes the issue "Therefore the primary key to the ORDER ITEM is the order item seq ID plus the primary key of the order, order id."Looks like an identifying relationship1. Or partial representation of a many-to-many relationship.
TAG : database-design
Date : November 22 2020, 10:58 AM , By : user105769
Dealing with dynamic dataset configurations for 3NF data for generic UI screens
Dealing with dynamic dataset configurations for 3NF data for generic UI screens
will be helpful for those in need I think you have already answered the question yourself. Depending on your database and client side code platform, one of these may apply as the best solution in terms of performance, maintainability and servicabilit
TAG : database-design
Date : November 19 2020, 12:01 PM , By : DaveF
How does the relationship between 2 tables in Rails models?
How does the relationship between 2 tables in Rails models?
may help you . I have 2 tables in Rails: , This is how you should do the one-to-one relationship in RoR:
TAG : database-design
Date : November 17 2020, 08:25 AM , By : Helpful Dude
When to do calculations
When to do calculations
around this issue Store all single details for each item, as you will usually need them later (for statistical/information purposes or any other reasons). You have to make sure that you always follow the same calculation logic to get the total sales
TAG : database-design
Date : October 24 2020, 11:12 AM , By : Debashree
How do I flag unread items of an RSS Feed?
How do I flag unread items of an RSS Feed?
around this issue Despite being optional, most RSS feeds provide a 'guid' element for each item, which is a string that uniquely identifies it. If the feed you're parsing provides such element, you can save the already processed items by storing the
TAG : database-design
Date : October 19 2020, 11:12 AM , By : Matt Leacock
BCNF of a Relation with no FDs
BCNF of a Relation with no FDs
I wish this helpful for you After additional research, I finally stumbled upon this definition of BCNF:
TAG : database-design
Date : October 08 2020, 12:00 PM , By : fedorafennec
SQL Event Store - One Stream Per Aggregate
SQL Event Store - One Stream Per Aggregate
wish of those help Most examples of SQL backed event stores that I am aware of use a single event table for all aggregates stored in the database. The basic shape being a BLOB column to hold the event, and then additional columns for useful meta data
TAG : database-design
Date : October 02 2020, 01:00 PM , By : Florian D.
Issue with return type "Table" in Snowflake
Issue with return type "Table" in Snowflake
may help you . I would like to be able to add this as a comment, but was not able to because of reputation. In order to better troubleshoot the query that you are receiving this error, can you please share the function? What is the value type of the
TAG : database-design
Date : September 30 2020, 11:00 AM , By : Hadley
Shall I centralize an association of subclasses in their superclass?
Shall I centralize an association of subclasses in their superclass?
will be helpful for those in need The answer to your question depends on the intended meaning of your association with the class Complaint. If any (potential) user has such an association, then you should centralize it in the User class, as in your d
TAG : database-design
Date : September 24 2020, 05:00 AM , By : user92243
Presto vs Impala: architecture, performance, functionality
Presto vs Impala: architecture, performance, functionality
To fix the issue you can do While the technical architecture, performance and functionality could be a very detailed subject, some of the key highlights I can think of ( based on the journey of both these engines in last so many years ) : Presto was
TAG : database-design
Date : September 23 2020, 12:00 PM , By : Pierre LeBoo
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