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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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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202 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
760 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 ...
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4answers
543 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 ...
4
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1answer
193 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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114 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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2answers
124 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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122 views

what is the best way to update 2 tables via data entry form in access 2007 database? [closed]

I have a database with more than 500.000 records, I am using Table_a to Accessing the files by the ID number,Name, Date, Address, Tel, ..... And then I used Table_b to archive files and locate the ...
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259 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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761 views

Changing primary key from varchar to int

I have a user table where I am use varchar as primary key. Now from a different place I got the performance tip that int is better than varchar for primary key. So I would like to change my primary ...
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120 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? ...
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303 views

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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279 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 ...
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2answers
145 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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4answers
529 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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37 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
162 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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502 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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2answers
3k 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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59 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 ...
3
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1answer
1k 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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148 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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39 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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225 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 ...
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1answer
417 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 ...
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2answers
425 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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89 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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37 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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153 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 ...
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1answer
254 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 ...
3
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1answer
86 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 ...
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1answer
100 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 ...
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1answer
115 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 ...
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90 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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127 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 ...
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597 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
112 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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2answers
73 views

Table design when one data is dependant of another and the second one has repeated values

I have a products, and subproducts. Like: Product Identifier - Product Name - Subproduct Identifier - SubProduct Name 1 ProA 1 SubProA1 ...
2
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1answer
156 views

Need help to design model with multiple rights

For a website, I have multiple elements that need to be moderated by many different users. Until now, I have always used Role-Based Access Control (RBAC) model but I want a more flexible model. I ...
0
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1answer
43 views

How to link several tables?

I'm a newbie at Database Designing. What I want to do is perform several actions at once. I have a main users table which holds all the data for a user at a website. Then I have a primary key as the ...
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1answer
163 views

What is the meaning of this anomaly warning message?

I have run an analysis with SchemaSpy. The tool gave me a warning message for two tables. The warning message is: Tables with incrementing column names, potentially indicating denormalization ...
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3answers
137 views

pros/cons of different ways to store whether a record is one of two options?

I am trying to store whether an address is a Work address or a Home address. There will never be another type of address. I'm wondering what the pros/cons are of the different ways to store this, ...
3
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1answer
43 views

How should permissions for anonymous users be modelled?

I'm designing a web application. There will be users who log into the site, but also anonymous, non-authenticated users, i.e. any member of the public who accesses the site. Users will be assigned to ...
0
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1answer
86 views

Index optimization

I'm building a 'tag' system for my blog posts. Currently my tags table has columns tagid - MEDIUMINT NOT NULL AUTO_INCREMENT PRIMARY KEY and tag VARCHAR(30) NOT NULL UNIQUE. And I have another table ...
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2answers
562 views

How to design this database to avoid cyclic dependency?

There are two tables: User Address User contains a reference to Address. Address contains the columns CreatedBy and ModifiedBy, which is reference to User. How do I design this database to avoid ...
2
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4answers
1k views

Database design - People and Organisations

Databases are not my primary skill and I am finding I need some assistance please. The software we are building has "Customers". The Customer could either be a Person or an Organisation. I really ...
5
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1answer
115 views

Many:Many with Shared Relation

I'm modelling data with multiplicity like this: Each Composition/Anthology related pair must share a Composer. Also, each Anthology must contain at least one Composition. How would you recommend I ...
2
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1answer
102 views

What are the risks for logging across databases via a trigger?

I've searched for this online and had mixed or unclear responses, and after posting on superuser, was directed over here. On SQL Server 2005, we currently log certain table changes via triggers using ...
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3answers
152 views

Database Design Confusion

I am making a Phonegap based ERP solution for school in which every school can configure their own school individually and can manage the whole school from that single application, in which a main ...
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1answer
227 views

How to handle “many columns” in OLAP RDBMS

I have a fact that has around 1K different numerical attributes (i.e. columns). I would like to store this in to a column-oriented DB and perform cube analysis on it. I tried to design a star ...