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-6
votes
0answers
41 views

How to calculate GPA in pl/sql [closed]

I need to calculate gpa in PL/SQL. Calculate the GPA for all students. Display the full student name, student ID and GPA (x.xx). See your CCC student hand book on how to calculate your GPA. But I ...
1
vote
1answer
83 views

How does I/O work for large graph databases?

I should preface this by saying that I'm mostly a front end web developer, trained as a musician, but over the past few years I've been getting more and more into computer science. So one idea I have ...
1
vote
3answers
127 views

Select custom output formats from database with SQL

I am planning to make a simple rest service application, and I am currently deciding the architecture. I have decided that I want to write the middle layer in multiple languages, so that it is easy to ...
2
votes
3answers
242 views

Tracking correct order details in commerce database when modifying 'products'

I am implementing an ecommerce database. This is slightly different than most as the 'products' that are for sale are for services provided. For example a user (vendor) of the system may define a ...
5
votes
2answers
242 views

Deploying Database Schema changes in a patching process [duplicate]

I am facing a conceptual development methodology problem that I was hoping you could help me with. Firstly, a little bit of background. Background The project I am developing is a niche application ...
0
votes
1answer
106 views

How to store Status for Reservation table

I have a reservation table (a user fills out a form to request a reservation). It has two parts that need to be confirmed. isReservationAccepted (decline,accept,waiting) and hasReservationBeenSent ...
0
votes
1answer
149 views

How does this normalized example work?

I had the following DB schema: Customer Car Rental ------- ---- ------ Name Name Car_ID ID ID Customer_ID Date This is said to be non normalized ...
0
votes
1answer
139 views

How should I evaluate the Database Solution for Large Data Application

Background I have been tasked to write an application that will be a combination of document and inventory management in VB.net which will be used to store document images in TIFF, PDF, XPS, TXT, DOC, ...
1
vote
1answer
154 views

What's the best approach to building a db schema for profile, but to track changes?

I'm working on a site where companies can create a profile then add locations for each profile. Those first two tables are simple enough. But any changes to their profiles or locations have to go ...
-1
votes
2answers
899 views

SQL Server: When to use SSIS vs T-SQL for ETL Tasks [closed]

When should I use one versus the other? For instance, let's say I have 20 comma delimited, denormalized text files and I want to transform the data and load it into normalized SQL Server tables.
1
vote
1answer
201 views

How can I maintain a SQL schema upgrade that goes out to our users on a regular basis?

I work on a project that uses a SQL database as a back end, and a desktop app as a front end. We do releases on a regular basis, and as part of a release, our client needs to update their SQL server. ...
1
vote
1answer
115 views

Visual Studio DBProjects and problem with it running post-build SQL (file too big)

What I am doing is creating a DBProject.. importing a DB.. then creating scripts in the PostBuild that are DATA scripts for each table (so that the post build can populate the tables after the schema ...
0
votes
3answers
180 views

How to maintain user relationship when user unfollows another user

I have a table of user relationship which stores who follows whom, the table structure is as follows -id -follower -following when someone follows any other user, I add a record with follower user ...
3
votes
3answers
208 views

Are database developers considered under DBA jobs?

This isn't career advice, this is more of a question of logistics. When looking at job market and such there is a lower than what I think would be out there of database admins but I'm curious if ...
3
votes
1answer
253 views

Database Schema Usage

I have a question regarding the appropriate use of SQL Server database schemas and was hoping that some database gurus might be able to offer some guidance around best practice. Just to give a bit of ...
0
votes
2answers
1k views

Fitting it together, database, reporting, applications in C#

Introduction Preamble I was hesitant to post this, since it's an application whose intricate details are defined elsewhere, and answers may not be helpful to others. Within the past few weeks (I was ...
11
votes
5answers
18k views

What are the advantages of myBatis over Hibernate? [closed]

I've done some research on my own and understand the basic concept. But some insights can only be gained through actual experience. What are the advantages of myBatis that would make it worth ...
3
votes
5answers
568 views

How do you keep track of the meaning of your SQL fields?

The more SQL fields I add to my tables and the more primary/foreign keys I add the more I lose the overview for specific fields for certain scenarios like Get/Add/Delete/Update data. I use SQL ...
2
votes
1answer
191 views

In-memory DB to perform intersects on set slices

I have a specific programming need where I need to efficiently store large sorted sets in memory, query them for ranges, and intersect them against other sets that are also queried for ranged. I am ...
2
votes
2answers
2k views

Development environment to manage multiple Oracle databases

I am in an enterprise environment where we have applications that need to run against multiple Oracle databases. Developers may need to manage multiple vintages of these databases to support ...
15
votes
2answers
4k views

Conflict resolution for two-way sync

How do you manage two-way synchronization between a 'main' database server and many 'secondary' servers, in particular conflict resolution, assuming a connection is not always available? For example, ...
2
votes
5answers
289 views

Organizing my products database

I’m developing a web-based store in MVC (very closely based on the SportsStore example in Pro ASP.Net MVC 3 Framework http://www.powells.com/biblio/61-9781430234043-0). I’m using a SQL database and ...
1
vote
2answers
553 views

How can I avoid concurrent access in PostgreSQL?

I would like to have your opinion, how I can handle the case when PDO engine and Hibernate engine "talk" to the same db? There is a PHP application as frontend, and a Java doing some job after user ...
1
vote
2answers
263 views

Handle all authentication logic in database or code?

We're starting a new(ish) project at work that has been handed off to me. A lot of the database sided stuff has been fleshed out, including some stored procedures. One of the stored procedures, for ...
22
votes
2answers
10k views

Best practice/Patterns for two way data synchronisation

Quite often in my work the idea of 2-way data synchronisation between database systems crops up. The classic example is two slightly different CRM systems (say, Raiser's Edge and Salesforce) and the ...
10
votes
4answers
650 views

How do I Integrate Production Database Hot Fixes into Shared Database Development model?

We are using SQL Source Control 3, SQL Compare, SQL Data Compare from RedGate, Mercurial repositories, TeamCity and a set of 4 environments including production. I am working on getting us to a ...
0
votes
3answers
338 views

database migration: upgrade schema deployed on client machines

I'm working on an application, which when deployed is installed locally on client machines, and uses a local database server. Stupidly, I didn't plan for schema changes -- and now it needs to change. ...
2
votes
1answer
602 views

Querying key/value store

I don't know whether this question is reasonably answerable (and therefore will be closed), but I will take my chances: What are the possible problems (and solutions), one might encounter, when ...
26
votes
8answers
14k views

Create my own database system [closed]

I need to learn how databases work in order to use them more efficiently, and my way of learning is by doing. I want to create my own database system. I am not referring to creating a pseudo-database ...
3
votes
3answers
1k views

What advantages do we have when creating a separate mapping table for two relational tables

In various open source CMS, I have noticed that there is a separate table for mapping two relational tables. Like for categories and products, there is a separate product_category_mapping table. This ...
3
votes
3answers
3k views

How to design a database wherein multiple tags(string) are to be associated with an id?

I have to design a database wherein I have to associate an audio_id with multiple tags(words). I am considering following approaches to select one from these: 1) To have multiple fields for multiple ...
7
votes
3answers
248 views

Are there best practices for checking for errors in business logic for DB refreshes? [closed]

I'm working for a company with very large databases which all refresh overnight, ready for users to interrogate in the morning. These over night loads essentially truncate all the tables, and reload ...
5
votes
5answers
537 views

Should I use a relational datamodel or Cassandra with ColumnFamily based indexes?

Currently we are working on some storage problems for log data from various servers and communication message logs (HTTP(S), XMPP). There will be many write operations and for read operations we will ...
6
votes
7answers
529 views

Should there be separate database schemas for each developer or should there be just one that all developers share?

During development, should developers each have their own copy of the database to work on ? Or should there be a common shared development database ? The former will give developers more flexibility. ...
5
votes
4answers
345 views

Constant database calls or store in objects?

I'm creating a pretty simple database driven application. Whenever I create a db app, I create classes that mimic the data in the db. Is this good practice? Am I better off making one big call to the ...
6
votes
12answers
3k views

Over normalization in database

Currently I am working on creating a new database schema as part of a major new product. Our previous customer address records (in a previous product) look something like this in our current schema ...
5
votes
1answer
2k views

Database Application Design Best Practices [duplicate]

Once upon a time it was common practice for both the business logic and database logic to be written in the same language (eg PL/SQL, Transact SQL, etc), more recently the practice is to separate the ...
11
votes
6answers
4k views

Isn't SQLite a bit underestimated? [closed]

Before I ask the question, let me first describe my thoughts about SQLite. I happen to like tools that are small, fast and, more importantly, have only the really necessary functionality. That's why ...
16
votes
8answers
2k views

Is writing your own Data Access / Data Mapping Layer a “good” idea?

We're currently in a situation where we have a choice between using an out-of-the-box object-relational mapper or rolling our own We have a legacy application (ASP.NET + SQL Server) where the ...
9
votes
2answers
4k views

How can I keep my visualstudio database project in sync with my database?

I'd like to have my database schema synchronized with my Visual Studio .dbproj database project. Right now, I'm using SSMS for most of my database development work, and I've to manually use the ...
0
votes
6answers
5k views

Real-time stock market application [closed]

I'm an amateur programmer. I'd like to develop a software application (like Tradestation), to analyse real-time market data. Please teach me if the following approach is correct, ie the procedures, ...
12
votes
3answers
6k views

Microsoft's current best practices for building a .NET data tier? And reality?

The development team I'm working with will be moving to .NET 4.0 soon, however, the data access class library we use still uses ADO.NET "classic", meaning SqlDataReader, DataTable, and the like. ...
9
votes
6answers
23k views

what do database programmers do?

Every time I read about Oracle programmers etc, I get confused. I don't know what exactly they do. From my understanding, application programmers need to develop the core functionality. The libraries ...
1
vote
5answers
1k views

What is better making a separate temporary table or inserting directly to big table?

I have a big table with 1,400,000 rows, and I need to insert 3000 rows daily in it. When I insert 3000 rows daily should I first insert to a temporary table than dump that temporary table to the ...
0
votes
1answer
62 views

what should i use running cron or getting by query

I have a table which has the amount,entrydate and amtperday field , which is to decrease daily. so what is better running the cron job daily to decrease amount. or or at the time of fetching data ...
19
votes
6answers
4k views

Front end first or Back end first. Of the two which is a Good system design pratice?

I have a client right now requiring me to develop a school enrollment system. Now this is the first time im having this kind of challenge. Most of the past software that i created are not that ...
5
votes
5answers
394 views

What are the standard practices for database access in .net?

I have seen weird database access practices in .net. I have seen stored procedures for every database tasks. I have seen every database property name is preceded by it's table name. I have seen fully ...
4
votes
4answers
973 views

Unit testing data access objects

I have recently started using test-driven development and unit testing, and it has paid off immensely in the areas where I have aplied it. One area that it has been helpful in is database access. When ...
9
votes
4answers
527 views

Stored procedure Naming conventions?

One of our senior developers has stated that we should be using a naming convention for stored procedures with an "objectVerb" style of naming such as ("MemberGetById") instead of a "verbObject" type ...
10
votes
5answers
290 views

Can it be a good idea to create a new table for each client of a webapp?

This is semi-hypothetical, and as I've no experience in dealing with massive database tables, I have no idea if this is horrible for some reason. On to the situation: Imagine a web based application ...