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https://docs.google.com/document/d/1mfDaU3RW89WA3wJfRH1hGdGddWOhofMP/edit?usp=sharing&ouid=112711162618141236570&rtpof=true&sd=true This document thoroughly explains database concepts, focusing on Database Management Systems (DBMS), Structured Query Language (SQL), and PHP connectivity. Database Fundamentals:  The document defines a database as an organized collection of electronic data and a DBMS as the software that manages it .  It covers types like Relational (RDBMS) and NoSQL, core terms such as Primary Key and Foreign Key, and principles like  Normalization  to reduce redundancy . Data Integrity & Control:  Reliability is ensured by  ACID Properties  (Atomicity, Consistency, Isolation, Durability) for transactions . SQL Commands:  SQL is categorized into DDL (structure definition), DML (data manipulation), DCL (access control), and TCL (transaction management) .  It details SQL operations like Joins (INNER, LEFT,...