Let\'s say that my models are User and Project. Each user can be assigned to many projects and each project can have many users assigned. This is a typical many to many relationship and could be store
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I\'m developing a room booking application in the browser using JQuery-Mobile. Initially I had modelled my bookings as records with a timestamp and field with duration.
I am writing a simulation which requires a backing database to store the results. The simulation writes a huge amount of data. For obvious performance reasons, I chose to try out a NoSQL database, spe
For example, you may have a report that joins on many tables, but in some software, they\'ll let you generate reports and customize the fields.
1NF requires fields to be atomic; that is, it should represent only a single value. He says because he doesn\'t expect for the data to be searchable, or开发者_如何学JAVA readable then it is not in vi
I have multiple arrays with about 100 possible values, ie: a[0] = (a, b, c, d) a[1] = (a, e) a[2] = (d, f, g)
my problem is that i have to make table which will have foreign keys, and one of three foreign keys have to be NOT NULL and rest have to be NULL.
The kind of information I want to store in this type is, for example: \"330.30 eur/ton\" or \"25.15 usd/kg\".
Country: countryID, countryName Region: regionID, countryID (FK), regionName City: cityID, regionID (FK), cityName
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