SQL
Structured Query Lanaguage
MYSQL
Database System sama as [MSSQL,Oracle]
it is poplaur database connecting with PHP .
(DEPRECATED) The mysql functions are procedural and use manual escaping.
Mysql has extension to connect to db.
MySQLi
is a replacement for the mysql functions, with object-oriented and procedural versions. It has support for prepared statements.
PDO (PHP Data Objects)
is a general database abstraction layer with support for MySQL among many other databases. It provides prepared statements, and significant flexibility in how data is returned.
RBDMS
Relation Database Managment System
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