Database design is the process of specifying the logical and/or physical parts of a database. The goal of database design is to make a representation of some "universe of discourse" - the types of facts, business rules and other requirements that the database is intended to model.
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Storing dynamic data in NoSQL
I have scenario where I need to store unstructured data but the rest of my data is structured and relational. An example of the type of unstructured data is as explained below:
User Type 1:
How do ...
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1answer
21 views
Optimize multiple self-JOINs or redesign DB?
I'm looking for advice on either optimizing multiple self-joins, or a better table/DB design.
One of the tables looks as follows (relevant cols only):
CREATE TABLE IF NOT EXISTS CountryData (
...
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0answers
37 views
Am I wrong in table design or wrong in selected index when made the table?
I've build web application as a tool to eliminate unnecessary data in peoples table, this application mainly to filter all data of peoples who valid to get an election rights. At first, it wasn't a ...
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0answers
31 views
How do I model the database for an application containing canvases which are divided into building blocks?
How should I model my database if I wanted to have this functionality:
I want to be able to create a canvas which has many building blocks (they are something like it's sections). There are many ...
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2answers
20 views
Should numeric identifiers like serial numbers be stored as integers?
Many of our databases store numeric tracking codes (like serial numbers) as integers. There is little chance of these codes every getting alphabetic characters, but it still seems like an incorrect ...
3
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40 views
financial transactions with and without commissions
I'm building a gambling website. All financial transactions from and to external sources (credit cards, money transfer systems) are subject to commission. Amount of the commission depends on the ...
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1answer
39 views
How to add custom sequence number in table which is going to be populated automatically
I have table something like this
CREATE TABLE [dbo].[ado_test_table](
[id] [int] IDENTITY(1,1) NOT NULL,
[tip] [varchar](10) NOT NULL,
[datum] [datetime] NOT NULL,
[doc_number] [int] ...
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1answer
41 views
Database with insert data every 2 minutes
I have a site to develop into PHP and mysql where I take, with a cron, every two minutes 10 xml from a server parse each and insert data into my database.
Well this data are simple string (maximum 10) ...
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2answers
27 views
Use timestamp(or datetime) as part of primary key (or part of clustered index)
I use following query frequently:
SELECT * FROM table WHERE Timestamp > [SomeTime] AND Timestamp < [SomeOtherTime] and publish = 1 and type = 2 order by Timestamp
I would like to optimize ...
4
votes
4answers
99 views
PK as ROWGUIDCOL or use a separate rowguid column?
There's a long-winded debate going on here so I'd like to hear other opinions.
I have many tables with uniqueidentifier clustered PK. Whether this is a good idea is out of scope here (and it's not ...
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0answers
22 views
Database design for railway reservation management [closed]
Dear Ladies/Gentleman,
I want to create database for railway reservation management as a part of project of final year. can anyone help me?
thanks
2
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0answers
36 views
What is Transaction Path Analysis?
I came across the term Transaction Path Analysis which I am not familiar with. A Google search resulted in only a few results, most of which seem to assume everyone knows what it means. From these my ...
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2answers
19 views
Software for generating SQL from UML?
Can you name any software which allow you to generate SQL from a UML model?
I have tried Enterprise Architect but its association class has no functionality.
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0answers
10 views
How implement MySQL unique index with two foreign key that one can be null?
I would know if can be declared in MySQl to create an index constraints in a table with two foreign key that one can be null.
For example cannot be repeated a null foreign key with the other foreign ...
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1answer
12 views
What is proper database design for a drupal table with an order field?
I am adding a custom widget to an instance of Drupal 6.x & MySQL 5.5 and came across a problem with updating rows.
I have a table of recipe ingredients where multiple ingredients are tied to a ...
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1answer
12 views
what is the best way to update 2 tables via data entry form in access 2007 database?
I have a database with more than 500.000 records, I use Table_a to Accession the files by the ID number,and Name, Date, Address, Tel, .....
And then i use Table_b to archive files and get the position ...
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2answers
43 views
Two nullable columns one required to have value
No-Explanation Question:
Is there anyway to have a constrain of 2 null values that always requires 1 to have value ? For example two date columns both null but having at least 1 that requires to have ...
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1answer
37 views
Changing primary key from varchar to int
I am having user table where i am using varchar as primary key.
Now from different place I got the performance of int is better over varchar for priary key.
So i would like to change my primary key ...
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2answers
65 views
How do you store tabular data in an RDBMS?
First: I really haven't got any idea how to google for this. If you got one, leave a comment.
If I want to store arbitrarily large tables in a database, how should I set up my database tables?
...
3
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1answer
162 views
+50
Relation to original tables or to existing linking table
In my database I have a table with different settings for my app. Each setting is in relation to a guest (table guests) and an event (table events). So basically each guest has specific settings for ...
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2answers
20 views
Database model: doubly linked list
I am not sure if I get this right. I'm designing a database model for use in an application, and I'm stuck at a doubly linked list (model first; there is no code yet).
There's an order. An order has ...
1
vote
1answer
53 views
Record versioning and promotion
Let's say we have this hierarchy:
-World
--USA
---WA
----Seattle
-----Downtown
------1st Ave
-------945 1st ave
------3rd Ave
...
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0answers
64 views
Effects of good and bad database designs [closed]
I want to know what effects good and bad database designs have. Any ideas which can be added to the list below will be very helpful:
Effects of a good database design:
Little or no data redundancy ...
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1answer
29 views
The network path was not found error after deploy application [closed]
i have been deploying and publishing my application for quite a bit now and everytime it worked fine. Now i published it again (no error, warnings,..) and updated my sql database tables like i do ...
6
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4answers
262 views
How can a database be normalized when an optional field causes denormalization?
Suppose you have a warehouse full of widgets. Each widget in the warehouse is stored in a specific identifiable location within the warehouse. You might have a schema which looks like this:
A ...
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1answer
25 views
dimension table with “like” condition
In an effort to scale some existing code, we are removing logic from CASE statements and putting it in dimension/lookup tables. Thus instead of CASE WHEN 'F' THEN 'Female' WHEN 'M' THEN 'Male' is now ...
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2answers
37 views
Usage of foreign key when the referenced table data will not change
I have to design a table where user has 10 fields and 6 are dropdown. Some are single selections and some multiple. Dropdown data is supposed to change very rarely.
For e.g., the user is presented ...
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2answers
43 views
Is there a good reason to store big text data outside database?
I was analyzing my MySQL database performance and found that tables containing text fields are just huge, larger than 1Gb.
This data is only used when loading single record (like article or blog ...
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vote
1answer
23 views
MySQL Workbench connect to MS Access
I have a .mdb file on my computer that I would like to convert into a MySQL Schema and I have found that there is a migration tool within Workbench. However it doesn't seem to allow you to connect to ...
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1answer
28 views
3nf but waste more storage space
I have a table which has three columns: account, idNumber, and position. The account and idNumber are unique.
Here is my thought to analyze and I don't know whether it is right or not.
account is ...
1
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1answer
63 views
Database design: Two 1 to many relationships to the same table
I have to model a situation where I have a table Chequing_Account (which contains budget, iban number and other details of the account) which has to be related to two different tables Person and ...
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0answers
43 views
When to split a large table
I run the SQL Anywhere DBMS, and we have a table of about 10 columns(normal text, timestamps etc).
However, in my use-case, every single day, the table gets 2160000 new rows.
It's also crucial that ...
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1answer
15 views
Table Design for user-specific and user-agnostic criteria
I want to design a table that is general enough to accommodate an increasing number of achievements as I come up with new accomplishments to reward. Initially, I thought to design the table as ...
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2answers
43 views
Time series data for ad platform
I am trying to figure out how to store time series data for an ad platform I am working on.
Basically I want to know some strategies/solutions for storing billions of rows of data so that I can ...
3
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0answers
96 views
Database table design question
Firstly, database novice here. I'm trying to create a system for processing Sales Orders into Purchase Orders and then split the Purchase Order into Shipping Containers. The systems needs to be able ...
2
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2answers
82 views
Recommendation for mySQL table structure (no code)
I need some advice on how to layout the tables for a mySQL database.
I will first describe what I am trying to do:
I have a table for users. (This covers basic info for now)
A user will select a ...
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1answer
51 views
When is it worth it to use Triggers and stored procedures/functions? [closed]
As an example, lets say I have a forum application and for every topic that is created, I have a trigger that fires a database function creating a post.(lets assume we have a topics table and a post ...
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4answers
33 views
Are all matching indexes (indices) searched for a query?
If I have multiple indexes that include a common attribute - will each index be searched upon a query involving this attribute? Or is only one index searched?
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0answers
58 views
Database Design: separating reusable & instance data
I'm developing an app which is basically a collection of checklists that have to be processed. I obviously need a database in which the information has to be stored. I just can't wrap my head around ...
3
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0answers
107 views
Where and how to store my weird datamart
I could really use some help here.
Here's my situation.
I'm building a datamart in SQL Server 2005, which will furnish a single report (for now). We have 26 clients (medical organizations) that ...
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1answer
48 views
DB Design - Which of the two is best-Normalized or Not [closed]
Please see the analysis below and let me know the best db design (InnoDB) out of the two.
Requirement- Faster Write and Read for users not having to wait when many concurrent DB connections exists, ...
3
votes
1answer
46 views
How to share resources among accounts?
Using google doc, I am able to share my documents with others. I wonder how they implement it underlying in terms of DB design?
The simplest way I imagine is to use a joining table which keeps a ...
2
votes
1answer
41 views
One database or multiple referencing one?
Database design: one database or multiple databases, which is best?
We have a database which has about a 100 or so tables, accessed by about five different applications. Five different applications ...
1
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1answer
37 views
Multi-variance products
My current system houses different variants of Products in different tables;
Productgroups
Productcolors
Productsizes
Productmodels
Products can reside under 1 Productgroup and can have ...
1
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1answer
31 views
How to “swap” out production tables
I have a MySQL table that holds a few thousand records which go out of date very quickly. A few times a day we run a slow process which needs to pull data from multiple sources and re-populate the ...
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2answers
39 views
Using a keywords table with multiple other tables
Using MySQL
I need help determining how to model a Keywords table to three different tables (Products, Certifications, and Exams) - I have included my model which is using what I refer to as ...
0
votes
1answer
59 views
How should I set up my social network database design?
I am designing a db for a Social Network type website where users enter lot of information varying from family member details, education, employment, personal favorite such as TV, movie, music, food, ...
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2answers
56 views
Can a surrogate key and a primary key be in the same table?
For example we have:
Surrogate key: ABC123
Primary key: 1
Name: James
Is this legit in a Data Warehouse table?
2
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2answers
46 views
notes / description string in another table in a relational database
I'm primarily a non-database developer, however I am familiar with normalization techniques.
A coworker was suggesting that it is correct for a table to store 'description' and 'notes' as a foreign ...
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Fine grained (milliseconds) temporal indexes in neo4j
What are the best practices for modeling fine grained timelines in neo4j? If I were to use milliseconds as the grain in the pattern described here and here would it prove somehow problematic and ...
