Suppose we have a database called studentdb, a table called class101 in the database with 3 columns ( id, name, gpa) and 4 rows as illustrated below.
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However, most of the database vendors have their own directs, e.g., PL/SQL (Oracle), Transact-SQL (Microsoft, SAP), PL/pgSQL (PostgreSQL). SQL, one of the earlier programming language, was subsequently developed by Donald D. Codd of IBM proposed the Relational Database Model in 1970. SQL defines a set of commands, such as SELECT, INSERT, UPDATE, DELETE, CREATE TABLE, DROP TABLE, and etc.Įdgar F.
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A table has rows (or records) and columns (or fields). This article is applicable to MySQL 8.0, which is the successor of MySQL 5.7, where 5 was dropped?! Introduction to Relational Database and SQL Relational DatabasesĪ relational database organizes data in tables.