Relational Algebra - Example
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Algebra is using variables such as x to solve a problem. One example is x+3=8 in which x equals 5.
Because equations are part of Science to explain the diversity of it. Example: H2o and other formulas....
There is no such thing as an 'Access' Relational Database.A Relational Database Management System is one that has been built to deliver the requirements set out by Edgar Codd in 1970 such that the functions provided by the software conform to relational algebra. This means that the validity actions of the database management system over the data contained in it can be modeled and proved on a mathematical basis.Oracle, DB2, SQL Server, MySQL, etc. all implement most of the requirements of Codd's paper.It is worth noting that the relational model is the ONLYone where the affects of putting data in it can be proven.
It means that for certain operations, you can change the order, such that a (operation) b = b (operation) a. For example, for addition: a + b = b + a, and for some types of multiplication, ab = ba.