What is the difference between javascript and SQL

Difference: JavaScript is a multi-paradigm dynamic scripting language based on prototype programming. It is often used to add a variety of dynamic functions to web pages to provide users with smoother and more beautiful browsing effects. SQL is a database query and programming language used to access data and query, update and manage relational database systems.

The operating environment of this tutorial: windows7 system, javascript1.8.5&&mysql8 version, Dell G3 computer.

What is javascript?

JavaScript ("JS" for short) is a lightweight, interpreted or just-in-time compiled programming language with function priority. Although it is famous as a scripting language for developing Web pages, it is also used in many non-browser environments. JavaScript is a dynamic scripting language based on prototype programming, multi-paradigm, and supports object-oriented, imperative and declarative (such as functional programming) style.

JavaScript is a high-level scripting language that belongs to the Internet. It has been widely used in Web application development. It is often used to add various dynamic functions to web pages and provide users with smoother and more beautiful browsing effects. Usually JavaScript scripts realize their functions by embedding them in HTML.

Main functions

1. Embed dynamic text in HTML pages.

2. Respond to browser events.

3. Read and write HTML elements.

4. Validate data before it is submitted to the server.

5. Detect the visitor’s browser information. Control cookies, including creation and modification.

6. Server-side programming based on Node.js technology.

What is SQL?

Structured Query Language (SQL), referred to as SQL, is a special-purpose programming language. It is a database query and programming language used to access data and query, update and Manage relational database systems.

SQL can be functionally divided into three parts: data definition, data manipulation and data control.

1. SQL data definition function: Able to define the three-level schema structure of the database, namely external schema, global schema and internal schema structure. In SQL, the external schema is also called View, the global schema is referred to as Schema, and the internal schema is automatically implemented by the system based on the database schema, generally without user intervention.

2. SQL data manipulation functions: including data insertion, deletion and modification of basic tables and views, especially strong data query functions.

3. SQL data control function: mainly controls user access rights to ensure system security.

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