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I am a student, with decent knowledge of SQL, but have had very little to do with triggers in the past. I've looked at a few sites for guidance, but comprehensive explanation on all commonly used statements seems fairly sparse.
Is there a 'definitive' site for this kind of thing? Perhaps like a w3chools for advanced SQL?
Once you know a little SQL, try to check out Joe Celko's books. Advanced SQL Programming has a short section on triggers. Since you're a student, you can probably get a copy at the library. If you think you're going to be doing deeper SQL dev work, you'll be glad to score your own personal copy of the book. You can get the relational DB engine to do a significant amount of work in a small amount of code - thinking that way will make you a much more efficient programmer. Most book stores (my local Borders always has a couple copies) will have a copy on the shelf, so browse before you buy.
Also, check out the online manuals for the database you're using as itsmatt suggests.
I've always thought that the SQL Server Books Online (installed with SQL Server) were a good source of info.
This sounds a bit like an "old shoe or glass bottle" question.
Triggers are one of those things that you should really stay away from unless you really really know what you're doing and have a very good reason for doing what you're doing. So naturally, one of the prerequisites to ever using a trigger is that you should have a thorough understanding of how they work and their implications. Thus, you can see how the idea of an "Intro to Triggers" text may sound like a very dangerous thing to some people.
So my advice, cruel as it may sound, is this: If you're the sort of person who needs an intro text on this particular topic, then you might be better served in the long run by simply avoiding Triggers for the time being.
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i received an university project where i'm asked to build and analayze database of a company. the company can be of any type and it must have several tables, for example: airline company that sales ticket (tables will be: sales, customers, flights, airports, ... etc).
i'm searching for free and open database of such company, where can i find one?
thanks a lot.
You're using one of those databases right now! Stack Overflow regularly publishes a data dump of their database, and Brent Ozar helpfully compiles it into a SQL Server database for people to practice query tuning and such. Here's a link to the most recent version I could find, but you can also search for something like "Stack Overflow Database" and I'm sure you'll be able to find other versions.
Additionally, if you want to run some queries of your own against the database without downloading the whole shebang and running SQL Server on your own machine, you can access a web-based service for querying the database directly at https://data.stackexchange.com/
Also note - if the goal of your project is to design a database, this might not be the way to go, since it's already done for you. But even if it doesn't give you something to design, it might still be helpful to study how it's set up to give you ideas for your own work.
You could fairly easily build a small database (items, orders) out of the chipotle dataset: https://github.com/TheUpshot/chipotle.
In general, companies don't offer up their data to the public (there tends to be proprietary info in them). Luckily you are more interested in the datamodel than the actual data. That said, the reality is you want something simpler than a real company's db. Real enterprise databases are unwieldly complicated - think of all the tables they will have related to things like sales tax rules for different localities.
I would start with something like what I mention above and expand it a little. Or just spend a few minutes thinking about the different things you would need to track for a business (like an airline), and just build the datamodel from that. You will get a much better experience and learn how things need to fit together.
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I've already tried EazFuscator and Dotfuscator but are bad! I was able to easily read the source and pay it, and frankly I'm tired of the people that I copy the software.
I ask you which obfuscator use, at least to protect all the software by beginners.
From the great Joel Coehoorn ... you can read more here
How can I protect my .NET assemblies from decompilation?
One thing to keep in mind is that you want to do this in a way that makes business sense. To do that, you need to define your goals. So, exactly what are your goals?
Preventing piracy? That goal is not achievable. Even native code can be decompiled or cracked; the multitude of warez available online (even products like Windows and Photoshop) is proof of that.
If you can't prevent piracy, then how about merely reducing it? This, too, is misguided. It only takes one person cracking your code for it to be available to everyone. You have to be lucky every time. The pirates only have to be lucky once.
On another note, I would recommend SmartAssembly by RedGate. Ive used this before and its great compared to others. Please note that like any obfuscator, you cannot stop someone cracking your software if they are determined to do so.
You can get more information here...
http://www.red-gate.com/products/dotnet-development/smartassembly/
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I'm currently developing the front end of a new CMS for a digital streaming company, the main problem the project has is keeping track of the technical language that has sprung up around it.
It currently involves around 60 staff in four countries, aside from a wiki (which has thus far failed to be kept up-to-date), anyone have any good tools or tips for building and maintaining a glossary for a project like this?
aside from a wiki (which has thus far failed to be kept up-to-date)
This comment makes me pretty nervous about suggesting other solutions. Wiki's can come with their own problems, but keeping it up to date is not a problem inherent in the platform. It's a cultural or organizational problem. A wiki provides a very easy way to track and update data. If, today, you cannot keep it up to date, ask yourself how you will solve this problem if you change the tool?
Changing to another platform could solve things like: The wiki isn't scalable for that amount of data; we want to make controlled edits; we need to release in multiple languages; we need to release in other formats.
For the updating problem, try something simple to start, like assigning a dedicated team member to glossary maintenance. They don't have to be the only contributor, but if you have someone who is dedicated to paying some attention to this area you will have a much better chance of keeping things up to date.
In an untended garden, it's not the fault of the soil that you have no flowers.
DITA has a glossary specialization. You can maintain a central company glossary in it. In individual company documents, you create a mini glossary topic then use a content reference to pull any terms you need into your document.
It does sound more like a version control issue though.
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I'm helping a friend learn SQL, and need more databases to help him get more practice.
We have of course AdventureWorks, Northwind, and Pubs.
Does anybody know of any other SQL databases samples that might be available to download?
I know some sites have some databases where you can practice queries on the site, but I was looking for something he can run locally.
Try downloading and importing some of the free data sets the Census bureau, US Geological Survey, National Oceanic and Atmospheric Administration, or other large data gathering agencies provide for free on the web.
Why not work with a billion record table of all the elevation points in the US? Not only do you get the practice your DB skills, you can get real world types of indexing and performance issues.
Here's one called the Chinook Database. It has scripts for SQLServer, Oracle, MySQL, SQLServer Compact.
http://chinookdatabase.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=21111
As I find more, I'll post here.
I think it is much better Idea to create a database from scratch ,Taking sample project say a simple inventory management system and then building tables finally creating then in db ,It would be much practical way to learn then to directly play with a ready made database.
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Perhaps if I make the my documentation better I could spend less time supporting developers and more time developing myself:
I develop a critical platform used by 10 other developers and 50 end users. The developers are of mixed ability ranging from domain-experts to relative beginners. Since I'm one of the people who know how the core platform works support requests from other developers usually go via me.
Our documentation is the usual sort of descriptive stuff any mature project will have: We have a large wiki containing details of all the usual operating procedures plus extensive API documentation.
Unfortunately it does not cater well for "how do I fix " type questions:
Would it be possible to make some interactive fault diagnostic documentation that puts users through a standardized fault-finding routine. The documentation would ask users a series of questions, and depending on the user's input would tell them what to do... it would be a very simple expert system, or possibly a documentation state-machine.
The idea would be to help newbies think more methodically about diagnosing faults in this complex system.
My question:
Are there any free tools intended to implement this kind of user-experience? I'd rather not hand-roll this. There must be some kind of framework for interactive help & documentation.
Has anybody implemented this kind of system before?
If you just wanted to have a flowchart/stat-machine thing where the user moves from the start point to a set of possible solutions by answering questions, then you could probably implement this as a set of wiki pages, where the possible responses to questions on one page are links to other pages.
This solution relies on being able to represent the answers to questions as links, which isn't going to work if the information is more form-like. For example, suppose one question is "What brand of graphics card do you have?" where the answer is one of 300 possible options. In this case it's going to be tiresome to create the links :)
If the developers are asking too many questions then I would suggest making them research the question themselves and come up with an answer, then double-check with you instead of encouraging them to ask you every time. It's much easier to ask somebody else than to find the answer yourself, but they're never going to learn if they don't look for themselves.
If the users are asking a lot of questions then you may need some user interface improvements. Try putting hints in the application itself at the top or bottom of the screen maybe.
For both groups of users a wiki can help.
a FAQ in your wiki
if an error happens too often, try preventing it or output a more useful error message (like "if this happens, the likely cause is that...)