What is ANSI SQL, Oracle SQL and MySQL?

ANSI SQL, Oracle SQL, and MySQL are terms related to relational database management systems (RDBMS) and the structured query language (SQL) used to interact with these databases. Let's break down each term:

1. ANSI SQL (American National Standards Institute SQL):

• Definition: ANSI SQL refers to the standardized SQL language as defined by the American National Standards Institute (ANSI). It is a standardization of SQL, which is a domain-specific language used for managing and manipulating relational databases.

• Purpose: The ANSI SQL standard defines the syntax and semantics of SQL queries, statements, and transactions. It aims to ensure consistency and interoperability across different database management systems.

• Features: ANSI SQL includes common SQL features such as SELECT, INSERT, UPDATE, DELETE statements, as well as data definition and manipulation operations like CREATE TABLE, ALTER TABLE, and JOIN operations.

2. Oracle SQL:

• Definition: Oracle SQL refers to the implementation of SQL that is specific to Oracle Database, a popular relational database management system developed by Oracle Corporation.

• Purpose: Oracle SQL is designed to work specifically with the Oracle Database. It includes extensions and features that are specific to Oracle, such as PL/SQL (Procedural Language/SQL), which is Oracle's procedural language extension for SQL.

• Features: Oracle SQL includes standard SQL functionality along with additional features unique to Oracle Database. It supports advanced features like partitioned tables, hierarchical queries, and the Oracle-specific extensions for PL/SQL programming.

3. MySQL:

• Definition: MySQL is an open-source relational database management system. It has its own implementation of SQL, often referred to as MySQL SQL or MySQL Query Language.

• Purpose: MySQL SQL is designed to work specifically with MySQL databases. MySQL is widely used in web development and other applications where an open-source RDBMS is preferred.

• Features: MySQL SQL includes standard SQL features and also supports MySQL-specific extensions and functionalities. It is known for its ease of use, scalability, and compatibility with various programming languages.

Summary:

• Common Ground: All three, ANSI SQL, Oracle SQL, and MySQL, share a common foundation in the SQL language for interacting with relational databases.

• Standards vs. Implementations: ANSI SQL represents the standardization of the SQL language, ensuring consistency across different database systems. Oracle SQL and MySQL SQL are implementations specific to Oracle Database and MySQL, respectively, each with its own extensions and features.

• Interoperability: While ANSI SQL aims at promoting interoperability, database-specific implementations like Oracle SQL and MySQL SQL may have unique features that are not standardized.

Understanding ANSI SQL is crucial for writing portable and standards-compliant SQL code that can be used across various database systems. However, when working with specific databases like Oracle or MySQL, you may also need to be aware of their unique features and syntax.