Used for Retrieving Data, Query Languages

A computer language that's often used on Database Management System (DBMS) and by other artificial language for querying a database or information system, is not a programming language but a query language. A query language is important to a server-side programmer, such as PHP(: Hypertext Preprocessor) developers, because it is a way to get the information that intended for a specific user, into a database. There are classifications of query languages like other computer language, and the popular three for the Web, of them are listed below, base on their popularity:

1. SQL, pronounced not as a word on My Sequel (MySQL) but as just exact as its letter names "S-Q-L", which is short for Structured Query Language and sometimes mistakenly referred as a programming language, instead of a well known class of a database query language for accessing and manipulating relational databases that items are organized in a set of tables, in which item can have relation to another item that's into another table.

   Let Say We've Relational Database Tables:
   - Customers - Orders ID Name 01 Mark 02 Anthony ID No 01 18495 02 82796
   Sample of SQL Queries on Database:
   SELECT Customers . Name AS `Customer` , Orders . No AS `Order No.` FROM Customers INNER JOIN Orders ON Customers . ID = Orders . ID ORDER BY Customers . Name
   SQL Queries' Sample Result:
   Customer Order No. Anthony 82796 Mark 18495

   • MySQL is the most used brand of a free Relational Database Management System (RDBMS) which administering by phpMyAdmin a free web database management for RDBMS. A relational database can be called as a server for storing sensitive data items. Most relational databases are administers by database managements.
     • Generally, a relational database is administering by a database management such phpMyAdmin for MySQL, which can perform various tasks like creating, modifying or deleting a database, table, field or a row, browsing, exporting or operating a table, running SQL query or searching data and more!
2. XPath, the XML Path Language, is a declarative language which is one of the 3 parts of Extensible Stylesheet Language (XSL), used to select nodes from an XML document, and also used by XML Pointer Language (XPointer) to link hyperlinks in XML document to the specific parts of another XML document, and used by XQuery which is built on XPath expressions.