The paper proposes a method of parsing for relational algebra expressions, which is based on the use of reverse Polish notation (postfix notation). The operation algorithm of the shunting yard, ...

For example, the problem of stock price increases, because relational algebra applies the theory of unordered sets in mathematics and does not create the concept of order for SQL, turns a simple ...

Relational Algebras We start by describing the classical (or non-categorical) view of relational theories because it should look more familiar to most people. The classical story starts with universal ...

(b) select project: Write a SQL statement that is equivalent to the following relational algebra expression. EXPRESSION: πterm(σdocid=10398_txt_earn and count=1(frequency)) (c) union: Write a SQL ...

NoSQL attacked both relational databases and SQL in the same vein. The main problem this time was that the Internet had destroyed the underlying premise of the 40-year-old relational database ...

First, let us stick with simple set collections. When we write a SQL query such as the SQL compiler translates that pretty syntax into a relational-algebra expression in terms of selection, projection ...