- Welcome to Reddit,
- Database Design for Dating Site
- Online Dating site algorithm, data-structures, and database : webdev
- Building a Dating Site With Neo4j: Part 7
So we see many problems here, not the least of which are frantic, screaming managers and sleepless DBAs. And this reinforces another famous saying: We also see how the effects of a bad design can spill over into the other departments in a company, raising costs and blood pressures and creating many fragile and unnecessary business processes to accommodate the bad design. Surely there must be a better way. Now, let's see what happens if we break down, repent, and just accept the fact that these promotions live and die by dates.
We would include 2 dates in the PromotedProducts table signifying the Start and End dates of the Promotion.
The first thing we then notice is that these 2 new columns must be included in the Primary Key, since there can now be several promotions for the same product. Here is the new database schema:.
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All we did was add the 2 dates in the PromotedProducts table, but the real magic is what the application does with this data: It would look in the PromotedProducts table using the effective dates to determine if the promotions are active and should be displayed. Using this design, let's look at the weaknesses of the previous design and see what's happened to them:.
This simple example illustrates how beneficial it is to consider including Effective Dates into your database schema.
I have seen both of these scenarios at work and the difference is too vast to be ignored. You go from a frantic, stressful environment focused on how to make the systems work to a relaxed, confident environment focused on how to better run the business. And all because you let the software handle all the work. And isn't that what software is supposed to do in the first place? So that is the good news. In the next article of the series I will present the impact and pitfalls of the Effectively Dated design above and how to overcome them.
We will build on the simple data model that we started with here and see what issues surface as you take Effective Dating further and further.follow link
Database Design for Dating Site
In the final step of Database Design, Joe Celko gives a simple but effective explanation of the norm Daily SQL Articles by email:. Stay up to date: Daily newsletters with brand new articles, scripts, editorials and a Question of the Day help you keep on top of SQL Server. Improve your SQL Server knowledge daily with more articles by email. Thank this author by sharing: The Concept Although we don't always express this in our database schemas, most data is temporal; it actually only lives over a period of time.
Below is a simple diagram of this schema: The Problem So what's the problem here? Let's illustrate how this design painfully falls apart: Wrong, by several counts: Once you accept that you have to run a batch job, things start to go downhill from there: What if management wants to start a promotion at midnight? You'd better be up and watching in case that batch job fails. If the batch job does fail, you're dealing with downtime or bad pricing, both of which result in a direct cost to the business.
Because you are deleting the promotion as soon as it's over, you don't have the capability to analyze how many orders the promotion generated, or do any other kind of analysis. Someone will probably get the idea that they should store this information off in an Excel spreadsheet somewhere so they can report it to management. You have now created an unnecessary business process and a questionable source of data to base management decisions on. Every time you do a promotion you have to set up a new batch job in order to insert the data. So there is manual intervention involved with every promotion setup, which means that every promotion turns into a development project, with development and testing phases.
It's a simple project, but a project nonetheless. This results in the following sorry list of circumstances: After a few failures, management will be frustrated and start asking the question "why can't we get this right? The business will undoubtedly be slowed down in its ability to do promotions and could be outrun by the competition in this regard. Forget about the possibility of doing many promotions at once The Solution Now, let's see what happens if we break down, repent, and just accept the fact that these promotions live and die by dates.
Online Dating site algorithm, data-structures, and database : webdev
Here is the new database schema: Using this design, let's look at the weaknesses of the previous design and see what's happened to them: No batch job needs to be run. The system is date-aware and automatically displays the right price at the right time. So, no downtime is possible from a Development standpoint, and no staying up at night: The Development Department doesn't even have to be involved.
My question is wheter you believe I can learn this code or pay for the code and implement it into a site or if the whole site needs to be built at the same time. Sorry, I'm a newbie so I hope this doesn't sound too bad.
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- Effective Dating Series Part I - The Problem!
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I look forward to your replies! Chayll , Dec 20, Rukbat , Dec 20, I just need to sit down and learn it. I'm trying to learn it because of the money thing and I figure there prob.
Building a Dating Site With Neo4j: Part 7
I guess I'll give it another try and see how well I do this time. Took me about 4 weeks. Script is written in Nette framework so in pure PHP it could take twice as much time.