Questions tagged [sql]

Structured Query Language (SQL) is a language for managing data in relational database management systems. This tag is for general SQL programming questions; it is not for Microsoft SQL Server (for this, use the sql-server tag), nor does it refer to specific dialects of SQL on its own.

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3answers
236 views

How to maintain user relationship when user un-follows 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 ...
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4answers
2k views

Why do relational databases only accept SQL queries?

As far as I know, most relational databases do not offer any driver-level API for queries, except a query function which takes an SQL string as an argument. I'm thinking how easier it would be if one ...
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2answers
518 views

Why OTServs have an item cloning problem if the server crashes? [closed]

OTServs are open source MMORPGs with a huge community. Mostly all of them have a serious problem: if the server crashes, people can clone items. This is a dirty trick that can be executed because the ...
200
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13answers
148k views

Why use a database instead of just saving your data to disk?

Instead of a database I just serialize my data to JSON, saving and loading it to disk when necessary. All the data management is made on the program itself, which is faster AND easier than using SQL ...
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2answers
199 views

Is NoSQL a good fit for a graphing app, and how can I compare different NoSql Servers?

I am traditionally a MsSQL or MySQL developer - I have been prototyping a new application that involves storing data from many targets. I have seen that the app appears to get slow after scaling to ...
1
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1answer
819 views

Database data structures for RESTful api

I am creating a RESTful API. I am struggling to decide on the best way to design my database tables around my resources. Initially, I though a table per resource would be a good way to go, but I'm ...
2
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1answer
2k views

Internationalization through SQL Database and performance issues

I'm using .Net technologies and because ASP.Net "instant translation" is not really easy to do with ResX, since it has to be compiled after every change, there are a few hacks available (http://www....
5
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2answers
4k views

Why is NoSQL better for this scenario?

Hypothetical scenario: Let's say we are downloading JSON from Facebook with details of a user's friend's checkins, posts, etc... These come in as one document per friend per activity, so with 8 ...
6
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2answers
2k views

Formatting SQL Based on an AST

I am working on my .NET open source project for generating SQL... Initially, I wrote the project so it spit out exactly one SQL format... ugly. I started using this project in the real world and ...
8
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4answers
872 views

Good idea to move logic out of SQL statements?

I'll preface this question by saying that I am very new to professional software dev. I work on a team that takes data in from other groups in my company and turns this data into reports usable by ...
6
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2answers
203 views

How would I make a suggestion for a change to the SQL standard

If I wanted to make a suggestion to a change to how the UPDATE statement works in SQL, how would I go about it? Is there a website for the next standard? I googled, but just kept getting the ...
4
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1answer
698 views

Algorithm to denormalize database

I have built a QlikView script generator (QVS), that can be used to generate large script files for data imports from SQL Server to QlikView. QlikView does not like 'fully' normalised database ...
2
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1answer
1k views

Is Clojure a 3GL or a 4GL?

A bit of background (in case I'm mistaken)... I think I understand that (it's an oversimplification): manually entering codes into memory (or on a punchcard) is "first generation language" using ...
2
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1answer
384 views

Is Neo4j graph database sufficient to itself for all query types? [closed]

Neo4j eases relationship traversals => especially useful for a social network for instance. But are there any scenarios when it's advised to associate an additional relational database (or other ...
13
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4answers
20k views

Database History Table / Tracking Table

Currently I want to structure a tracking/history table like this: PrimaryKey - ID OtherTableId - fk fieldName - name of the field its tracking OldValue NewValue UserName CreateDateTime So basically ...
14
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6answers
3k views

Do You Still Need Indexing After Database Normalization

After you have done a good normalization, do you still need to index the table? How is this going to affect the performance? Will it even affect the performance in some way after a good normalization? ...
0
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1answer
518 views

For PL/SQL, do large companies prefer ANSI SQL joins or old Oracle joins? [closed]

I am interviewing for a PL/SQL position with a large corporation. I will have to write a multiple choice exam. I am wondering whether the exam will likely use old-style joins (joining happens in the '...
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1answer
2k views

Static Tables vs Dynamic Entity Attributes Storage Configurations

I am trying to figure out a better way to decide table storage configurations whether it will use static configurations using tables or dynamic configurations using EAV (entity-attribute-value) When ...
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4answers
2k views

Should database queries be abstracted out of the page itself?

When writing page generation in PHP, I often find myself writing a set of files littered with database queries. For example, I might have a query to fetch some data about a post directly from the ...
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4answers
729 views

Storing Dynamic SQL in text files vs inline code

Our Architecture team is proposing a framework that would see our SQL queries moved from coded strings within our applications, into a file based system where we would invoke them with function calls. ...
25
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5answers
3k views

Multiple database accesses or one massive access?

What is a better approach when it comes to performance and optimal resource utilization: accessing a database multiple times through AJAX to only get the exact information needed when it is needed, or ...
0
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1answer
1k views

TFS SQL Deployment Data Script

We are using TFS and SQL Server 2005 (looking to upgrade to SQL Server 2012 if that makes a difference). We store our database schema in a Visual Studio Database project (VS 2010). When code is ...
6
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3answers
3k views

SQL RDBMS : one query or multiple calls

After looking around the internet, I decided to create DAOs that returned objects (POJOs) to the calling business logic function/method. For example: a Customer object with a Address reference would ...
0
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1answer
755 views

Concurrency checking with Last Change Time

I have an app with the following three tables Email (emailNumber, Address) Recipients (reportNumber, emailNumber, lastChangeTime, status) Report (reportNumber, reportName) I have a C# application ...
38
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3answers
37k views

self referencing tables, good or bad? [closed]

Representing geographical locations within an application, the design of the underlying data model suggests two clear options (or maybe more?). One table with a self referencing parent_id column uk - ...
0
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1answer
602 views

Address search from large text file

Basically I want to develop a Address lookup(part of my project) using C# (and I can use SQL if necessary). I have a very large text file which have all the UK address and postcodes. Addresses needs ...
4
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2answers
1k views

Best practice to represent SQL in program source code

Where SQL statements are executed from a program, what is the best practice to store the statement text? Most often it is in a read only string, in the source file it is executed in. I think a ...
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5answers
5k views

Is it Considered Good SQL practice to use GUID to link multiple tables to same Id field?

I want to link several tables to a many-to-many(m2m) table. One table would be called location and this table would always be on one side of the m2m table. But I will have a list of several tables ...
1
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1answer
578 views

Structure of a correctly implemented JTable with TableModel and Listeners?

I am pretty new to Java and its JTables and this is where I am struggling at the moment. I need to create a GUI which shows me results of a sql query like SELECT * FROM tblPeople WHERE name='Doe'. My ...
-1
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1answer
2k views

How to use PostgreSQL on AWS - Ubuntu 11.10 [closed]

I'm extremely new to cloud-computing, Linux, and PostgreSQL, so if this is a stupid question, I apologize. I've managed to create an m1.large instance running Ubuntu 11.10, connect via Putty SSH, and ...
-1
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1answer
1k views

keeping connection open all time in sql

I have developed a Windows application in c# in which multiple users can add some numbers and their name and can view the data entered. The problem that I have is that the sever is on my laptop and ...
0
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4answers
422 views

Is comparing an OO compiler to a SQL compiler/optimizer valid?

I'm now doing a lot of SQL development at my new job where as before I was doing Object Oriented desktop app stuff. I keep running across very large scripts (thousands of lines) and wanting to ...
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3answers
11k views

Storing Attendance Data in database

So i have to store daily attendance of employees of my organisation from my application . The part where I need some help is, the efficient way to store attendance data. After some research and brain ...
207
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14answers
101k views

“Never do in code what you can get the SQL server to do well for you” - Is this a recipe for a bad design?

It's an idea I've heard repeated in a handful of places. Some more or less acknowledging that once trying to solve a problem purely in SQL exceeds a certain level of complexity you should indeed be ...
2
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1answer
1k views

Established coding standards for pl/pgsql code

I need to standardize coding practices for project that compromises, among others, of pl/pgsql database, that has some amount of nontrivial code. I look for: Code formatting guidelines, especially ...
5
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3answers
2k views

Should we have a database independent SQL like query language in Django?

Note : I know we have Django ORM already that keeps things database independent and converts to the database specific SQL queries. Once things starts getting complicated it is preferred to write raw ...
5
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4answers
981 views

Designing a Database Application with OOP

I often develop SQL database applications using Linq, and my methodology is to build model classes to represent each table, and each table that needs inserting or updating gets a Save() method (which ...
3
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2answers
658 views

Forced to write Stored Procedures

Can you think of some reasons that the management force the developers to write and call Stored Procedures instead of inline SQL statements directly? Even a very simple CRUD statement, writing a ...
2
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3answers
707 views

How To Start Programming [closed]

I have taken a programming course 2 years ago but I haven't worked in programming since then. I recently found a programmer job, but there is no programming team so for me to gain valuable experience ...
7
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4answers
3k views

C# database communication technique

A few days ago, I read an answer stating that writing queries within your c# code are long gone. I'm not sure what the specific person meant with the comment but, it got me thinking. At the company ...
0
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2answers
392 views

Visual C++, CMap object save to blob column

I have a MFC CMap object, each object stores 160K~ entries of long data. I need to store it on Oracle SQL. We decided to save it as a blob. Since we do not want to make additional table, we also ...
3
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1answer
2k views

Calling MSSQL stored procedure from Zend Controller ? Any other approaches?

MSSQL and DB, Zend as PHP Framework, I am using this way to call SP with I/P Parameters and to get O/p Parameters. It seems I am writing SQL code in PHP. Any other good approaches? $str1 = "...
1
vote
1answer
2k views

How can I implement a database TableView like thing in C++?

How can I implement a TableView like thing in C++? I want to emulating a tiny relation database like thing in C++. I have data tables, and I want to transform it somehow, so I need a TableView like ...
6
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5answers
14k views

Externalising SQL Queries in Java

What are the advantages and disadvantages of externalising SQL queries in Java (or similar general-purpose object-oriented programming language. Externalizing means storing all SQL in a separate non-...
4
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2answers
512 views

Proper Data Structure for Commentable Comments

Been struggling with this on an architectural level. I have an object which can be commented on, let's call it a Post. Every post has a unique ID. Now I want to comment on that Post, and I can use ...
14
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4answers
4k views

TDD with SQL and data manipulation functions

While I'm a professional programmer, I've never been formally trained in software engineering. As I'm frequently visiting here and SO, I've noticed a trend for writing unit tests whenever possible and,...
4
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3answers
1k views

Appropriate use of SQL CLR

We have some back end processes that runs* on our sql server (SQL Server), they involve processing claims. This requires both data manipulation (biz logic) and data read/write to tables. The biz ...
1
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2answers
1k views

Registration: Email hash and verifying only one account per email

I'm using a registration function that hashes the email in PBKDF2 with a random and unique Salt each time. The hashes email and his salt are saved in the DB. No problem with that. The problem is that ...
2
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1answer
2k views

Best way to remove list items from an existing record

Ok more of a conceptual question here: Say I have an existing record of type Meeting. When I go to edit the meeting I have a listbox with all current meeting participants, and one with all employees. ...
45
votes
4answers
47k views

Why is SQL's BETWEEN inclusive rather than half-open?

Semi-open (or Half-Open, Half-Closed, Half-Bounded) intervals ([a,b), where xbelongs to the interval iff a <= x < b) are pretty common on programming, as they have many convenient properties. ...