5
votes
1answer
56 views

Many-to-many relationship with attributes

I'm working on a project where I need a book database. The problem is as follows: A book can be related to multiple people (authors, editors, traslators, etc.). Then a person may contribute to ...
0
votes
2answers
50 views

One table with a flag or two tables

I have a problem with the design of a database: In my Android application i need to store the upload (the status, so if the file is in upload it will report the % of the upload) of a file and a list ...
0
votes
1answer
44 views

Foreign key double inheritance SQLITE

I'm designing a domotic system database and I'm trying to figure out how to represent two foreign keys. This is the cardinality I want. Consider 1...N Areas (rooms, halls, kitchens, etc.): Area 1 - ...
0
votes
1answer
166 views

Database design for mobile app

At first I would like to say hello to all of you, since it is my first post here on DB Administrators. I am writing an app which store drinks and their data. At the beginning it was storing all in ...
0
votes
0answers
18 views

Performance One Row With Total Vs Multiple Rows with Seperate Values?

Not 100% sure how to explain this situation but here it goes: I am building an Inventory Database that all items received are entered into and a label is created for each Container, that is going to ...
1
vote
0answers
285 views

SQLite Design: Better to have many tables with few columns or few tables with many columns?

I am struggling to figure out the best design for a Sqlite database that will hold data about Facebook pages so that I can calculate benchmarks for how the average Facebook page performs. I have an ...
1
vote
1answer
165 views

Database schema for a variable-level hierarchy with variable types?

A client is asking for a database structure for a medical translation app that involves narrowing down a health issue and then asking specific questions on it. The tricky part of representing this in ...
-1
votes
2answers
80 views

checking number of occupied occupied neighbours [closed]

Assuming a pixel grid with x and y of the size 1000 over 1000. In each iteration\run, using a random number generator, certain cells will be marked as occupied. Those cells will be written in a SQLite ...
1
vote
1answer
123 views

Database design: nested tagging

I have a situation that after an initial thought ended in the following tables: section: id, name section_tag: id, name section_tag_map: section_id, tag_id item: id, name ...
1
vote
1answer
286 views

Referencing multiple tables from a single table and store additional data

I have a database where I want to store lap time information from a racing game. I have tables for car, track, game, tuning and upgrade data and want to put all these together to create a single ...
4
votes
1answer
462 views

SQLite3 simple database design question

I'm an ruby hobbist with no experience at all related to databases. I'm writing an application that is going to gather and backup tweets and blog posts (via rss feed) in an SQLite3 database. The ...
-1
votes
1answer
505 views

How to link data from a table to another table in sqlite database?

I need to link data from a table to another table. I'm not sure how to do this. I have never link a table to another table. Anyone can help me? Or maybe can give me examples or sample codes? Thanks =) ...
7
votes
1answer
242 views

Performance of query with a range condition and order by

We have the following table (in SQLite on Android) which a tree structure (Nested Set model) of words and their frequencies: lexikon ------- _id integer PRIMARY KEY word text frequency integer ...
2
votes
1answer
1k views

Default values in SQLite3

When I created the table structure of my SQLite database, I provided a DEFAULT value which is used when no value is provided by the user. Now, because the application code changed, I need to modify ...
2
votes
1answer
853 views

How to create a train schedule in SQLite3?

I am interested in what a SQLite3 database schema would look like for a train timetable. Generally this is presented in table format as the final result. Sample Schedule for M to F STATION A ...
5
votes
1answer
348 views

Design for file based with many events

I'm not a database guy but I need to design a database to store events for our application. Our client app connects to remote hardware and syncs count data. The count data are csv files split into ...
2
votes
1answer
975 views

Track daily view count of youtube videos

I am making program that searches youtube for given keyword and need to get links of active videos. Term "active" means that video must have 1000 views per day. Youtube API doesn't give such ...
2
votes
4answers
154 views

Is there a “standard way” to log network messages (events) into a database?

I have two applications communicating over a LAN via events contained in network messages. Each message (i.e. an UDP packet) contains only one event. Messages are heterogeneous, meaning that the first ...