Answer:
The expression is :
π[cd) + π(g,h) ],[π(e,f)+π(a,b)])
We will use foreign key and primary key
XML (eXtensible Markup Language) is a meta-language that defines a language (of your creation, within XML specs). The language that you create has to follow your specifications.
The storage that is used to store data in the computer's memory that can be used by a program later when executing instructions is variables.
<h3>What is variables?</h3>
Variables can be defined as the way or process in which data or information are store in a computer memory.
Data or information that may likely change or be altered are often stores in a computer memory storage called variables and this store data can be retrieve later for use by a program when executing instruction on the computer system.
Inconclusion the storage that is used to store data in the computer's memory that can be used by a program later when executing instructions is variables.
Learn more about variables here:brainly.com/question/23931018
A way to store a sequence of letters, numbers or symbols.
This is the most accurate statement, though not entirely true.
Hope this helps.
