A relational database is a database consisting of relation variables (which are also called *relvars*, *R-tables* or just *tables*). The definition, manipulation and integrity rules of relational databases are based on relational operations equivalent to or similar to the Relational Algebra and Calculus.
What is the difference between Views and Materialized Views in Oracle?
sql oracle view relational-database materialized-viewsIn class, we are all 'studying' databases, and everyone is using Access. Bored with this, I am trying to do …
mysql sql foreign-keys relational-databaseI've found the concept and meaning behind these methods to be a little confusing, is it possible for somebody to …
laravel orm eloquent relational-database relationshipGood Overviews Generally speaking, you're making a decision between fast read times (for example, nested set) or fast write times (…
sql database tree relational-database hierarchical-dataI have read the quote : data depends on the key [1NF], the whole key [2NF] and nothing but the key [3…
database relational-database database-normalization 3nfWhat is the real difference between one-to-many and many-to-one relationship? It is only reversed, kind of? I can't find any …
sql relational-databaseIs it that a primary key is the selected candidate key chosen for a given table?
sql relational-databaseThis example is taken from w3schools. CREATE TABLE Persons ( P_Id int NOT NULL, LastName varchar(255) NOT NULL, FirstName …
database-design relational-database primary-key ddl database-tableDisregarding performance, will I get the same result from query A and B below? How about C and D? -- …
sql join relational-databaseI have two SELECT statements in SQL Server like these: (SELECT [UserID] FROM [User]) (SELECT [TailUser], [Weight] FROM [Edge] WHERE […
sql sql-server-2008 relational-database