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In this article, we will learn about schemaand databaseand the basic difference between them. schemaand databaseare two of the most important terms in Database Management Systems (DBMS).

Every organization, school, college and other institution has its own 数据库. They use it to manage their data and retrieve it in an organized manner.

Before creation 数据库, it must be designed and finalized schema, containing all its 实体,, 属性and relationships.

Here entities, represents the table and attributesrepresents the column name. The relationship between entities/tables can be 一对一, 一对多to 多对多reduce redundancy.

Once schemayou finalize it, it's a good idea to create one database. This is because databaseit's always being updated, but schemathere's no good reason not to update it more often. Otherwise, data across the organization will be disrupted.

SCHEMADATABASEThe difference between

What isSCHEMA

schemaIt is a logical representation that describes the entire 数据库structure definition or description. schemaIt cannot be changed often; that is why you have to be very careful while designing it.

If it changes frequently, it will disrupt the company 数据库's data in. How? See the following screenshot.

In the screenshot above, we have taken schemaa small section of the University . In the above schema, you can see what entities are included, what properties they can have, and how they will relate to each other.

You may have noticed schemathat is presented in diagram form; it is called 模式图. schemaIt does not show databaseall aspects of , such as databaseinstances of .

What is数据库

A collection of organized and interrelated data is called 数据库a . databaseIt is an application that stores data. It has various applications including MySQL, Microsoft SQL, Oracleetc.

Each 数据库one is different as each company/organization has its structure, data types and constraints. 数据库It is updated regularly to get the latest data about the companies.

数据库It can be maintained both manually and digitally. In this age of data ubiquity, digital 数据库is preferred and used. 数据库The size of depends on the data and needs of the organization.

SCHEMAandDATABASE

• databaseschemaThe basic difference between and is that databaseoperates periodically while schemachanges infrequently.
• schemaIt is not 数据库a structural definition, 数据库but a collection of organized and interrelated data.
• databaseThere are schemarecords of and tables, but schemaincludes tables, attribute names, attribute types, constraints, etc.
• DDL (Data Definition Language) statements are used to generate and modify schema, whereas DML (Data Manipulation Language) is used for 数据库data manipulation in .
• schemaDoes not use memory for storage, but databasedoes use .

MySQL SCHEMAandDATABASE

In MySQL, databaseand schemacan be used interchangeably. When writing SQL queries in MySQL, you can use SCHEMAinstead of DATABASEand vice versa.

See the following examples; both queries will create one 数据库.

CREATE DATABASE database_name_one;
CREATE SCHEMA database_name_two;

Oracle schemaanddatabase

According to enterprise-level database solutions such as Oracle, schemais a collection of tables, databaseis schemaa collection of . See the figure below.

in conclusion

In this article, we learned about schemaand databaseand tried to understand with an example. We also studied their main differences in schemaand .database

The article also emphasizes schemathat and databaseare the same in MySQL but different in Oracle.