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.

learn more… | top users | synonyms

4
votes
1answer
556 views

What is Rainbow (not the CMS)

I was reading this excellent blog article regarding speeding up the badge page and in the last comment the author waffles (a.k.a Sam Saffron) mentions these tools: dapper and a bunch of custom ...
0
votes
1answer
2k views

Database Driven Web Application, C# Front-End and F# Back-End meaning

Hi I am an intern working with ASP.NET. My current task is to make a website which will incorporate some jquery viewing features. This project seems to me will be primarily dealing with reading data ...
0
votes
3answers
1k views

Is this overkill? Using MDX queries and cubes instead of SQL stored procedures

I am new to Microsoft's SQL Server Analysis Services Cubes and MDX queries. Where I work we have a daily sales table in SQL Server 2005 that already contains an aggregate of sale information per ...
2
votes
1answer
844 views

Which would be a better way to load data via ajax

I am using google maps and returning html/lat/long from my MySQL database Currently A user picks a business category e.g; "Video Production". an ajax call is sent to a CodeIgniter controller the ...
1
vote
2answers
546 views

SQL language drawbacks, The Third Manifesto

Sometime ago I read about SQL language drawbacks (the basic language specification, not vendor specific), and one of the drawbacks was that the language does not allow to create a set of tuples that ...
5
votes
5answers
595 views

Alternatives for comparing data from different databases

I have two huge tables on separate databases. One of them has the information of all the SMS that passed through the company's servers while the other one has the information of the actual billing of ...
0
votes
2answers
424 views

Will TSQL become useless because of new ORMs? [closed]

By introducing LINQ to SQL, I found myself and my .NET developer colleagues gradually moving from TSQL to C# to create queries on the database. Entity Framework made that shift almost permanent. Now ...
2
votes
5answers
4k views

SQL Strings vs. Conditional SQL Statements

Is there an advantage to piecemealing sql strings together vs conditional sql statements in SQL Server itself? I have only about 10 months of SQL experience, so I could be speaking out of pure ...
2
votes
1answer
7k views

how to compare two large sets of data using PL/SQL?

I have two different tables in two separate databases with around 1.5 million records each. (BTW: im working on oracle databases) The objective is to check if every record present in table A is ...
3
votes
1answer
662 views

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. ...
1
vote
1answer
382 views

Implementing Bulk Update feature and its trade offs

The feature to implement is to allow a user to select items and apply data update in bulk. It is very similar to JIRA's ability to bulk update a list of selected issues. In my case: I iterate over ...
5
votes
2answers
394 views

Good architecture for user information on separate databases?

I need to write an API to connect to an existing SQL database. The API will be written in ASP.Net MVC3. The slight problem is that with existing users of the system, they may have a username on ...
6
votes
5answers
3k views

Two database fields for date and time - should they be merged?

In the following question, field and table names have been changed to protect their identities. If I have two database columns: MONKEY_DATE DATETIME NULL (with data e.g. 2012-05-14 00:00:00.000) ...
4
votes
3answers
353 views

Rule of thumb for field sizes

What VARCHAR sizes should be used for first and last names, phone numbers (preferably international), email adresses, urls, dictionary words and file names? Edit: Zapped the introductory phrase to ...
3
votes
4answers
195 views

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, ...
4
votes
6answers
3k views

Confusion about proper use of * wildcard in SQL [duplicate]

Suppose I was writing an address book application where the details of each contact were stored in an SQL database. A user wants to know all the details for a person whose name is "Bob [Someone]". ...
33
votes
6answers
61k views

How do I make complex SQL queries easier to write? [closed]

I'm finding it very difficult to write complex SQL queries involving joins across many (at least 3-4) tables and involving several nested conditions. The queries I'm being asked to write are easily ...
1
vote
2answers
2k views

Designing complex query builders in java/jpa/hibernate

I need to build complex sql queries programatically, based on large filter conditions. For example, below are few sample/hypothitical filter conditions, based on which i need to fetch users Country: ...
2
votes
2answers
456 views

Where should SQL/DB Queries be encapsulated in a software system?

I frequently write small applications (either web based or otherwise) that require heavy database usage. i've attempted various ways of handling where to put the actual sql queries (sort of ad-hoc ORM ...
1
vote
2answers
1k views

SQL DB design to support user feeds (in application like facebook)

I have a social network server with a MySql DB. I want to show the users feeds like done in Facebook. Example - UserX now Friend with userY, userX did like on postX etc. Currently I have table: C1 : ...
9
votes
6answers
572 views

Software solution from the 2000's, should I attempt to patch or remake the whole thing?

I was sent out to discuss a system that a certain company is currently using and what should be done with it. The company manufactures various carton displays. This system was developed to keep track ...
4
votes
7answers
9k views

What is the best approach for database design with lots of columns?

I am writing a query based financial application. It lets the user to write complicated equations (much like WHERE part of an SQL query) and find companies matching those criteria. For the above, I ...
4
votes
4answers
3k views

Can NoSQL databases be used in e-commerce companies for order management?

Is it possible to use a non relational database be in an Order management system for an e-commerce company with a large number of orders everyday, like Amazon? Can the benefits of Non Relational ...
0
votes
4answers
238 views

Is it possible (or desirable, if not) to make an database engine organize the order of sql statements to maintain the referential integrity?

Today at work I found the following situation: We had two tables, A and B, with B having a foreign key linked to the primary key of A. On our application, we got two main situations that created ...
9
votes
7answers
3k views

What are the advantages to using SQL query builders?

Are there any advantages to using a query builder, rather than using raw SQL? E.g. $q->select('*') ->from('posts') ->innerJoin('terms', 'post_id') ->where(...) vs: SELECT * FROM ...
3
votes
7answers
221 views

Throwing an Exception if a Query Doesn't Use an Index

I'm working on a largish webapp that was developed by several other programmers and I keep running into performance issues caused by poorly written SQL queries and queries that don't use an index. ...
0
votes
1answer
172 views

Recommendation for a database to query records with attributes that are arrays or hashes?

I'm building site with a very simple data structure: documents that are nodes that reference other nodes that each have arrays of parents, children and siblings, so the structure is: Node: uuid name ...
7
votes
7answers
383 views

Logistically, how do you manage embedded SQL?

My current application is running into issues with its ORM, and we're relying on some pretty hairy SQL to express queries that the ORM can't. Are there best practices in terms of how to manage the ...
2
votes
1answer
731 views

Sanity of design for my in-memory object representations of database rows

I've been trying to revise the structural design of the C#.NET-based system I'm currently working on. The new design involves a rather light-weight object-relational mapping framework (we're trying ...
10
votes
6answers
2k views

Why is SQL known as a relation-based / functional language?

We're learning that most languages are classified as either of the two, "relation based" or "high level". I've never used SQL before, but from reading its syntax it seems more like the ...
4
votes
2answers
894 views

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 ...
12
votes
4answers
7k views

Maintaining referential integrity between a mobile client and a server

So I have a relatively simple system. A mobile client creates records in a sqlite database that I would like to have synced to a remote SQL server (that is shared with other mobile clients). So when I ...
14
votes
4answers
14k views

Best way to maintain data between local and remote sql databases

So I have, what would seem like a common question that I can't seem to find an answer to. I'm trying to find what is the "best practice" for how to architect a database that maintains data locally, ...
0
votes
2answers
438 views

How to solve a fundamental cloud data storage dispute?

I'm working for a company that has recently hired me to create a new version of their existing software, which is now over 12 years old. The new software is a complete re-write of the old and they ...
8
votes
4answers
31k views

Best practice to query data from MS SQL Server in C Sharp?

What is the best way to query data from a MS SQL Server in C Sharp? I know that it is not good practice to have an SQL query in the code. Is the best way to create a stored procedure and call it ...
6
votes
2answers
3k views

How can I design a model layer without ORM, and when should I use it?

I'm a PHP developer who started with CodeIgniter. In it, designing models was easy: it seemed like each method defined in models was the equivalent of static methods in a normal, objected-oriented ...
3
votes
3answers
3k views

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 ...
0
votes
2answers
157 views

Suggestions for search methodology requested

I am throwing this question out to the 'greater creativity' for some suggestions on search methodology that might solve this problem. I have come up with a somewhat contrived example to attempt to ...
56
votes
6answers
4k views

Why the Select is before the From in a SQL Query? [closed]

This is something that bothered me a lot at school. 5 years ago, when I learned SQL, I always wondered why we specify first the fields we want and then where we want them from. According to my idea, ...
3
votes
1answer
6k views

Automatically adding data from JSON to SQL

I'm really new to this sort of stuff; my background is in C# mainly. Could anyone point me in the right direction? I need to set a script to automatically parse some JSON into an SQL database ...
0
votes
2answers
410 views

Programming certificates [duplicate]

Possible Duplicate: Are certifications worth it? I'd be glad to hear your opinions on which programming certificates are the most widely recongnized in the industry and how useful are they ...
3
votes
2answers
390 views

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 ...
2
votes
5answers
821 views

Worst practices in developing database applications [closed]

In constrast to http://programmers.stackexchange.com/questions/123591/database-design-good-practices I wanted to ask: What are the top worst practises you encountered when having to work with other ...
3
votes
2answers
1k views

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 ...
7
votes
1answer
12k views

Entity Framework vs. Linq to SQL? [closed]

I'm a little bit confused about these two terms "Linq to SQL" and "Entity Framework". I have the general idea that both of them somehow allow you to refer to database tables as .net objects or ...
24
votes
6answers
50k views

SQL Triggers and when or when not to use them.

When I was originally learning about SQL I was always told, only use triggers if you really need to and opt to use stored procedures instead if possible. Now unfortunately at the time (a good few ...
13
votes
6answers
4k views

Interacting With Data Using Multiple Databases/Servers

All of the projects that I've had to deal with so far have only required a single database on a single server. I'm interested in learning more about how projects that need to scale move to multiple ...
0
votes
3answers
775 views

What is likely to be the bottleneck between the SQL Server, IIS and .net when receiving json as text from the DB?

I have spent the best part of a month working on the jQuery Calendar plugin. The setup is such that all the calendar entries are stored in a table inside SQL Server and im using a single "Select As" ...
6
votes
2answers
405 views

What are some useful resources for learning tuple calculus?

I've been trying to go over my tuple calculus over and over again. What's worse is that my professor and tutors are not much help during their hours. Does anyone know a good place to learn about ...
2
votes
2answers
221 views

Are there standard strategies for defining job flow and dependencies?

I'm working on a project that involves the chaining of separate jobs into a single master job, though there may be parallel paths in the chain leading up to the final output. Job and chain details ...