The logical model and/or physical design of a database.

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Database Design For Social Network apps

I'm going to build a social network app. Each user will have photos, videos, details, posts etc. My question is when a new user registers, should I generate many new tables for that user or have one ...
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43 views

Inbound Outbound Shipping Database

should we combine both inbound and outbound shipping into a single table (then create an additional column to identify the direction) or to split them into separate table? What's the pros and cons?
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58 views

Is following way is right Database model for following problem?

I am new to the database design so I have to check my data model is correct way to handle the problem or not. Problem Statement: I am designing the database for student portal which have following ...
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68 views

Database design: Is there a much better way on this current relationships?

I have a facultyand studenttable to store each information, respectively. I made a contacttable to store the contacts of either faculty or student. I would like to use the contact table as a generic ...
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3answers
107 views

Schema Design with “Seasonal” Data

I am developing a SaaS web application for School Management. What I need help is this: The whole application is purposed for the current year that the School is in. However, some data and ...
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48 views

How to segment account info and profile info?

I am putting a rough SQL database design together and have gotten stuck on how to segment information about the users. (Note before I get into anything, stored passwords are salted and hashed, I just ...
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37 views

Big lists in a relational DB

I need to store a list of items and that list belongs to a single user. The lists are going to be huge, so this has to be done as efficiently as possible. The lists also have to be modifiable to a ...
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44 views

Finding the same value in a column and only returning rows without the same value

I have a query that i have to find the DiscountPercent that are the same and not show the rows with the same DiscountPercent. I have tryd this and it brings back the values that are the same SELECT ...
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298 views

Store data of feedback form

I am a novice at database management and doing a small project on Feedback System. My question is that I want to know that how i should store the data of feedback form. Suppose i have different ...
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108 views

Most efficient way to set up a database handling millions of links? [closed]

I'm looking at making a site that will potentially have up to a million users, and each user will have hundreds/thousands of links connected to a set of sites, as well as other info. I'm using mysql ...
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80 views

EAV table question

What's the best design for taxonomies in EAV tables? taxonomy id autoincrement name unique terms id autoincrement tax_id references taxonomy(id) name text unique value text ...
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2answers
55 views

ERD Design for Campground and Campsite

I am designing erd for campground and campsite. In general, a campground has many campsites in it. that lead to one to many relationships. but sometimes campsite has no campground, it appears as the ...
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59 views

Should I have a parent table with only one field?

My database has multiple tables that all rely on dates. I was wondering if it would be smarter for me to take the date attribute and throw it in a parent table, rather than give each table a date ...
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56 views

database design question - How to make the table 3NF and have no orphans

I trying to find out what is the best way to build schema for port-nic associations: I am storing all information about ports (e.g eth0, eth1, lo0, lo2 of a Linux pc) in a table called ports and NIC ...
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42 views

Auto number for big data

I'm working with application that can have millions of data. Just wondering if it is ok to use auto_number as primary key. I have read that bigint, int etc has limit. So for example site is on live ...
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53 views

How to design a database for storing phone attribute?

I'm trying to capture following attributes : Name,Company,Price,Size,Weight,Release date,Gms,No of sim,Camera details,SIM details,Screen size,Screen type,Processor and Ram details and all.. Any lead ...
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73 views

Does my database design work? Newbie!

I've uploaded an image of my database design below. This is the first database I have designed and I was hoping that I could get some input into whether or not it is set up correctly or if I just have ...
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57 views

Primary keys: composite and singular

In general when I design tables I always include a single unique field, even if it there is already a unique combination of columns available to create a primary key. This field is usually either a ...
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1k views

Select rows from table where each row refers to a different schema

I have customer table in public schema. And I have a schema named after each customer. Each customer schema contains different tables like portals, plugin, ... When I want to select portals used by ...
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231 views

Uber-wide tables: Time to switch to Mongo?

As a web developer, I've typically only worked with nice, normalized tables in SQL-based RDBMS, but I'm doing some data consolidation for a researcher who will be analyzing correlations between all ...
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29 views

Can we determine FDs if we are given some tuples?

I am taking a databases course and i'm learning about functional dependencies. I have searched around and did not find any information on this. My questions is if we are given a table with some ...
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112 views

About schema design of NoSQL DB.(How to query multiple data?)

I just got a requirement, to build a web only with Redis. Data of the web is something like this(I write as RDBMS): User Info: user_id,first_name,last_name,age,..... Address: ...
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2answers
312 views

Excel spreadsheet into a MySQL database tables

I am relatively new at database design and would like to get this right from the start. I have had differing advice on how to do this and believe that the common suggestion of importing all the data ...
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118 views

One MySQL Database or Many MSSql Databases

At the moment I have an in-house Access database, data stored by our online survey provider, and data stored by our project management provider, both in databases. What I want is an in-house database ...
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34 views

Will column size change when trying to use single unicode character in place of multiple ASCII characters?

I have a column in utf8_unicode_ci collation for text type in MySQL. The content is in Unicode, I have used tags like {br}, {v}, {t}, {h} etc.., throught the database. I am now thinking of changing ...
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83 views

Alternative to RDBMS: Modeling Exam/Testing data

I'm a born and bred relational database guy and C# programmer dude. IBM DB2 & VB.Net in school. TSQL & C# at work. I'm planning a project for fun: Designing a Testing platform that goes from ...
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683 views

Copy of a database with an existing database with schema and data in sql server

I have two databases one is having master kind of tables and other will have transaction data. I should create a new database with a structure of an existing database to my clients. Here is the ...
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175 views

What is the best design for storing courses subscription data?

Building an app that will manage lessons, students, courses. Each lesson belongs to a certain course. A student can subscribe to a single lesson or to a whole course. So it seems straightforward that ...
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152 views

Daisy chaining two is-a relationships?

I'm currently dabbling in ER modeling and wondering if it is possible to create a chain of is-a relationships. Example: Here I'm basically trying to model specific in-stock items available for rent ...
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76 views

What does normalization say about storing data from objects that use a decorator pattern?

I am just curious as to what the best practices are for storing the data from objects built using decorator design. I have a base class and can decorate it with A, B, and/or C, with A B and C having ...
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2answers
305 views

what is a good use case for splitting user table by role

I have a requirement where there are primarily 5 roles in the system. Each of these roles increase in hierarchy from junior to senior most role. Each junior role is a subset of its immediate next ...
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141 views

Schema design for storing item combination with order

What I need: Three types of items, and user can add/delete items. Use will select some items from those three packs, and arrange an order according to his/her preference. The number of records ...
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1answer
35 views

tables relationships in database

Just a basic question here but it's been bothering me for a while. Do all tables have to be related to another? I'm trying to design a database so far I have 15 tables, 13 of them have relationships ...
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61 views

Design for periodic data cuts

I've been building an application that has a 6-monthly update schedule, i.e. a cut of the data for H1 & H2 of each year. The previous version of this application implemented this by making a copy ...
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64 views

can I use many-to-many relation with weak entity

I have an entity, for example employee(key employee ID), and every employee can have multiple responsibilities. Every responsibility can be tasked to multiple employees. I have 3 options: 1) Create ...
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21 views

Should I use one-to-many or many-to-many to log previous records?

I have 2 tables, company and interns. the initial relationships are, An intern belongs to only one company. A company has many interns I have a slight problem with these relationships. If the ...
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37 views

Composite Key for Gizmo Tracking

I'm trying to setup a many to many relationship between an gizmo table and a owner table. A owner can have many gizmos And a gizmo can have many owners When I have a linking table do I set the ...
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28 views

Additional info on some rows in the table

I am trying to design an MS Access 2013 database to keep track of an inventory of items. All items have certain common properties, like name, date they were stored, location of the physical item, ...
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247 views

Database Normal Form (financial statement)

I would like some advice on how to design the database for financial statement data which objectively addresses the tradeoffs between usability, performance, maintenance and adherence to normal form. ...
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1answer
174 views

Division Email Template DB Design [closed]

First question for me on the DBA SA site! This is for an Java email notification app using MySQL for backend. I have a small number of groups in our organization, [Marketing, Commerce, ...
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116 views

modeling data dimensions as columns - some dimensions are highly variable while others have low variability

Please excuse my question if it is a bad one - I am not a DBA... I would like to model the following data: Let's say that I have one column that is the row id as generated by a sequence. Let's also ...
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41 views

Effects of monolothic databases on performance and security?

Please note: although I'm specifically calling out MySQL here, I would also appreciate/entertain generic answers that apply to all/most relational systems. As a developer I don't see the design ...
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120 views

Trying to map postal codes to their respective cities, but running into some issues

The Problem I am creating a database of Countries, Regions, Cities and Postal Codes. Here's an example to give an idea of the database structure as it is now: Now, let's take Tuskegee University ...
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1answer
74 views

Database design: Which will perform better, auto incremented column or a composite key for appointments

The schema of table is : appointment(date,time,patientID,...) pateint(patientID,PName,age,...) PS: two or more patient can came at the same time . The number of appointments per day up to 500 . ...
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1answer
137 views

Copy database from one mysql sever to another mysql server

Following are the details of the database and server: Server1: Host Name: abc Port Num: 01 database: test Server2: Host Name: xyz Port Num 02 database: spareparts userid: spts password: abcdefgh@123 ...
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272 views

ERD Design for Employee Leave

I found the following ERD design: Which trying to capture as much information about employee leave (i.e sick, travel, etc). What am trying to understand is what does the columns: Table : ...
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2answers
212 views

Design a Lab Report tables [closed]

I need to design tables for a laboratory test. I will have Lab test name, and its component to be saved. The component can be changed with time. I need to design a UI for update. Also each ...
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33 views

Is it possible to create this type of database for a massive forum? [closed]

Kind of like how craigslist you select a state, then a city, and you're in that community. How do I make my forum website's home page have 2 drop menus for a state and city, then it would bring the ...
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596 views

Database design: same products in inventory but with different cost

I am trying to design a database for a Stock and Sale System and I have the following issue. Suppose there is an item in stock that costs $ 100 (product cost, not the selling price), but there are ...
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997 views

Schema for a reservation system

I'm working on a reservation system schema and have some problems defining availability of resources. I searched for similar question here and on Google but still don't have clear understanding My ...