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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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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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 ...
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How to represent a collection with capacity in a database?

Concerning normalization of a one to many relationship, I am not sure how to represent a collection with a specified capacity in a database. I can think of two ways to represent an entity A with a ...
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Software development - The industry & general trends / Bad practices [duplicate]

I am a Web Developer and part of a small team working on an abundance of projects. This is my first "actual" real company after graduating with a degree in computer Science and I have about 2 years ...
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3answers
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What is selection and what is projection

I am working on Android with the query() method of the ContentResolver class and it accepts 6 parameters, (uri,projection,selection,selectionArgs,sortOrder,cancellationSignal) for selection and ...
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Entity Framework with no direct table access

There are some similar questions I've found here, but none of them fully answer the question I'm asking. Similar questions: here and here In my company, I develop C# .NET applications and our Server ...
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2answers
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Best practice in application design / SQL authentication

I am currently involved in the implementation/design of an existing application for a large scale customer. The application has a similar model as e.g. vCenter Server whereby a number of components ...
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Logic design question for SQL query

Was wondering if you could help me on a SQL problem I’m having. I have a set of records of events where each event has a start time and end time. No event has the same start time, and the end time ...
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Why should I add CHECK CONSTRAINT?

Following is a table creating script created by Entity Framework using the model shown in https://codereview.stackexchange.com/questions/14077/is-it-proper-tpt-inheritance. In this script, there are ...
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Is a traditional client app which connects directly to a database a good idea?

After using Django's excellent admin interface, I was pondering creating a similar system which wasn't as tied to an ORM. Now, while considering this, I thought that overcoming webapps limitations (...
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Deep SQL relationships to a C# object model

I have a database with deep table to table relationships for example Clients (one to many) -> ClientData (one to many) -> ClientJob (one to many) -> ClientProcess (one to many) -> ...
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Bill of materials database design in EF codefirst?

I'm having trouble generating a proper database design for bill of materials in EF Code-first I just need a general structure then ill add additional fields So i need to have a Product that is ...
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1answer
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How to perform a 2 way sync from many client applications to central server?

I have many client applications that sync up to a central server. I am using C#, MS SQL server, Win Forms, ASP.NET MVC + API. I need to learn/figure out how to perform a 2 way sync for data changes ...
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How would one build a relational database on a key-value store, a-la Berkeley DB's SQL interface?

I've been checking out Berkeley DB and was impressed to find that it supported a SQL interface that is "nearly identical" to SQLite. http://docs.oracle.com/cd/E17076_02/html/bdb-sql/dbsqlbasics.html#...
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two approaches to database modeling - which one to use when

recently I have noticed a new approach to data modeling vs what I have used so far. This seems to be a way to address modeling of an entity that has a very large set of fields and quite often many of ...
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2answers
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When and how much should we validate input when working with (C)AP storage?

Herein, we consider a server-client architecture. Suppose we keep the details flexible, but there's more than one layer of servers supporting our hypothetical service. The general question is "When ...
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1answer
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Need help with system migration plan

I need to rewrite old ASP.NET web forms VB application to new ASP.net mvc in c#. Problem is that most of the old application logic for data inserting retrieval is written in stored procedures, which ...
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1answer
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Trigger on primary key instead of identity

I have the following problem- About ~60 tables on SQL that some have foreign key to each other,primary key as identity had to change to something else with logic. It was replaced by triggers that ...
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1answer
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Status Bar Timetracking Design

I'm currently developing an application in ASP.NET using SQL as the backend database. In my header, I have a status bar that displays the current status of the user and a timer that shows how long ...
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4answers
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Choosing value in SQL query vs (Java) code

I need to choose one of three values of an integer using the value of a column on a nullable column of a table. There are at least two approaches: 1) use SQL to do all the work: test null values, and ...
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OOP (php) for beginners - some unclarities

I started reading some tutorials about OOP, because I want to learn the basics. I have a question about it. I understand how you can have a object "Car" and give it a color like this $oCar->setColor("...
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1answer
697 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 ...
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1answer
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Preferred approach to a matching process

I am currently in the process of putting together a matching algorithm. The matching process is as follows: Query data is used to perform a "lookup" on a set of reference data in order to determine ...
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1answer
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Dependency analysis from C# code through to database tables/columns [closed]

I'm looking for a tool to do system wide dependency analysis in C# code and SQL Server databases. It's looking like the only tool available that does this might be CAST (CAST software), which is ...
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8answers
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How to make ability to order records in DB?

I need to make ability to reorder records, storing in DB (I use MS SQL, but seems it's no matter). I see possible 2 solutions: Add Order column. Then if we want to reorder 2 records, we need to ...
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3answers
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Is it better to use a switch statement or database to look through 5,000 to 10,000 instances?

I have some JSON data in this format (5,000 instances for now): {"id":"123456","icon":"icon.png","caseName":"name of case"} I am allowing the user to search for the name of the case and then return ...
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3answers
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DB Queries in code or use Stored Procedures

Some of my colleagues tells me that using stored procedures in the database adds to much business logic in the database, and that you should keep the data separate from logic. Other colleagues tells ...
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4answers
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Why can't clients query the DB directly using SQL?

Given that a lot of modern web applications just consume JSON data from the sever, what is the point in having a REST api at all instead of just using SQL's query language? Nowadays people are ...
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Should I be learning Linq, Direct SQL Commands (in .net), EF or other? [closed]

Basically, I have a very good knowledge of plain old SQL coming from Classic ASP programming. Over the past couple of months, I have been learning C# and today was my first full day at MVC 3 (Razor) ...
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4answers
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Other things to learn for becoming a Database Admin/Developer?

Obviously i'll have to make some sort of choice at what DB i choose to go with (MS-SQL/MYSQL/etc) but this question isn't about that. The question mainly is what other languages/tools would be ...
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Should I use foreign keys in my database if I use laravel?

I'm creating a website with Laravel for the first time. I checked relationships documentation today and it seems that Laravel just uses simple SQL queries. class User extends Eloquent { public ...
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2answers
772 views

Referencing countries via Foreign Key Constraint

To make things simple to explain: I've got two tables: Table1 and Countries. The Countries table contains a nice flag and some information, such as DisplayName, the ISO3166 ALPHA3 code and the phone ...
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1answer
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Is indexing foreign keys a good practice?

Looking at DB tables created by a different developer I have noticed that whenever a table had a forein_key_id field/column, it was always an INDEX/KEY. I am not sure if it was manually created, or ...
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5answers
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Violating SQL principles

I have to write a decent size database, 1GB more or less. I have only taken an introductory semester regarding SQL databases. During the course we learned that the relational model under SQL has no ...
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3answers
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T-SQL stored procs orders of magnitude faster than LINQ

According to answers I've seen on stackoverflow, stored procedures (and to a lesser extent db functions) tend to perform better vs. LINQ + ORM frameworks (e.g. Entity Framework). I want to determine ...
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2answers
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How to infer the result of a query?

To understand what a query does, I have always thought the following is the procedure on evaluating a query: Form the table as specified in the FROM clause. Pick the rows from that table as specified ...
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3answers
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What kind of user info is ok to be stored as plain text in SQL Database?

I'm practicing around building e-commerce asp.net applications that allows for users to register to the site and their user credentials are stored in a MySQL database. In my sample project the ...
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5answers
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Need thoughts on a course curriculum for an entry-level programmer [closed]

Would love to know your thoughts on a curriculum that will be developed for people that want to get started in the programming field. The goal of the course is to help it's students to ensure that ...
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1answer
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How to handle rating? [closed]

I want to implement like/dislike system, but I don't know how to achieve best performance. I have to tables: blog posts and comments that need rating. Should I store all data in one rating table? Or ...
3
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3answers
525 views

Is there a 'standard' SQL that can replace all the various custom versions?

I have been writing SQL for over 10 years now. I am extremely proficient at it and have experience working in SQL Server, Oracle, MySQL, PostgreSQL, etc. While there are multiple standards out there, ...
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2answers
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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 ...
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4answers
953 views

Keeping a ratio column that's the division between two other columns

I'm about to build a SQL table where I want to store currency orders. That means that I need to store how much I paid for a certain quantity, and the ratio between both quantities. So for example: +--...
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1answer
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What is the best way to store a formula in a database for a table driven formula? [closed]

So I am changing my code over to a table driven formula system to make it sustainable in the long term. So basically I have 5 foreign keys that will get me to a single formula to use. However I'm ...
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1answer
902 views

Is a series of OR or a single IN SQL statement better?

I'm using MS SQL 2008 R2. I have been using a series of OR and have an issue where my app periodically give the following error: Exception message: Timeout expired. The timeout period elapsed prior ...
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1answer
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When deciding a Primary Key, can I use Date part of a DateTime field

I'm designing a payroll system I have designed a database with several tables and this question is related to following tables EMPLOYEE (Employee_ID [pk], Name,... etc) LOCATION (Location_ID [pk], ...
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2answers
183 views

Is using -1 as a special Id a good idea in SQL?

I'm trying to determine if using '-1' in an Identity column has any drawbacks, or if there is a better way to do what I want. In my database I have User table and a Group table. All users must belong ...
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3answers
771 views

Best Practice regarding table schema

We are discussing in team regarding best practices. For eg. there are three tables Users Groups Teams A user will create a request to join a Team or Group or to follow a Private User. A request ...
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1answer
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How is one or more aggregate function implemented in most SQL engines?

In the book Database Fundamentals, Silberschatz. It is explained that aggregate functions can be calculated on the march. This make sense. What it means is that for calculating the maximun, average ...
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1answer
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Creating a online database creator

I've been thinking of creating an online database creator (think DabbleDB, Zoho Creator, Intuit Quickbase, etc.). I've been thinking of a couple solutions: Have 4 database tables: Tables, Rows, ...
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4answers
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What's the utility of encouraging users to learn SQL and possibly the ability to execute it?

Facing a situation where I can't possibly get all the features that are requested into each version of the LOB I support, I've evolved a number SQL query templates that users have and send to me, ...