This repository contains my personal SQL notes, organized topic-wise. Each topic is stored in a separate file so you can read or contribute notes for individual SQL areas (for example, DDL, DML, Joins ...

1970 − Dr. Edgar F. "Ted" Codd of IBM is known as the father of relational databases. He described a relational model for databases. 1974 − Structured Query Language appeared. 1978 − IBM worked to ...