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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SqlServer: can one table's PK be the FK of other two table's? [duplicate]

I have three tables project, users and proj_user. The PK of proj_user table is the FK of project and users table's pk e.g.(project_id,user_id) My question is, is it possible for the project_id and ...
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How to break table into two without losing performance?

According to http://stackoverflow.com/a/174047/14731, splitting away infrequently-needed columns frees up the cache allowing faster retrieval of the commonly-used columns. I've got a table whose ...
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212 views

Database Design Help: MySql/PostgreSQL Single Database/Multiple Databases

We are planning to build a web based custom business analytics tool using PHP and MySQL/PostgreSQL. In our application, we are planning to upload customer’s data using a Excel sheet and these data ...
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1answer
36 views

String templating technique

I am working on a fitness app that is going to deliver notifications to the user. I intend using MySQL events to populate the necessary tables, and then using an Ajax timer or Websockets or whatnot to ...
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2answers
554 views

SQL Server 2012. Update second table based on input from first table

I have two tables in two databases: Table01 in Database01 and Table02 in Database02. Both tables have a column called UserID. The UserID column is created when the user creates a new account on the ...
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113 views

Configuration Table

Can someone explain what is the difference between a Configuration table and a Data table in a database? And how to design or implement Configuration table? I'm using MySQL and the requirement is to ...
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1answer
65 views

What do you call numerical coding systems that are left-aligned?

I'm writing an importing mechanism for the NAICS database. I have a few questions about this code-format. I've seen it before and I like it the setup. I'm going to ask some other questions about ...
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2answers
793 views

Which schema is better for a shopping project? [closed]

I'm working on a business-to-customer project that has variety of product types. There are a few properties like name, description, brand_id that each product has but there are also many specialized ...
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To normalize or not

I'm scraping data from a website and they have pages for Users and Groups. The pages are pretty similar; id, name, description, created date, number of elements and custom background. They also have a ...
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3answers
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Design concerns for using 3x bit or one char(1) or one integer in table for holding status of item

I need to extend my existing table with status column. I am in doubt how to do that in most appropriate way regarding of future use of that status and performances of existing table. My table is ...
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1answer
168 views

Relational database primary key requirements

I am trying to put together an ER Diagram to design a fairly simple asset tag tracking/inventory management system for our servers/switches/UPS/etc. The top-level entity corresponds to the business ...
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2answers
770 views

Database design of Ledger Account and Balance sheet generation

I am building an application which has deposit and loan accounts management, for which i have to develop ledger accounts and then generate balance sheet. Being new to database design, i am having a ...
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1answer
1k views

What is the difference between int(8) and int(5) in mysql? [duplicate]

I found out, that if you have a field defined as INT(8) without ZEROFILL it will behave exactly as INT(5) in both cases the maximum value is −2,147,483,648 to 2,147,483,647, from −(2^31) to 2^31 − 1 ...
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1answer
208 views

Trouble in Multi-Language DB

I'm working on a DB design for medicines in many countries with different languages. I created a table for the different languages I want and link it to another table of chemicals. But I find that ...
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1answer
547 views

MySQL table with multiple values in one field

I'm building a database for a real estate company. The real estate properties are managed by sales people using a CodeIgniter website. How should I proceed with the database design for this table? ...
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2answers
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How to snapshot or version a relational database when data changes?

My system receives data feeds. Each data feed will end up creating inserts and/or updates to most tables in the (relational) database. I need to capture the snapshot of what the entire database ...