This article mainly introduces you to the basic knowledge of mysql database.

Recommended reference tutorial: "mysql tutorial"

Database

1, Definition

Database can be simply explained as: An efficient medium for storing and processing data (mainly divided into two types: disk and memory) .

2. Classification

According to different database storage media, it can be divided into two categories: relational database (SQL) and non-relational database (NoSQL, Not Only SQL) .

3. Example

Relational database:

• Large-scale: Oracle, DB2, etc.;

• Medium: SQL Server, MySQL, etc.;

• Small: Access, etc.

Non-relational databases:

• Memcached, MongoDB and Redis, etc.

4. Difference

Relational database:

• Safe, it saves data to disk and is basically unsafe Data loss may occur;

• is a waste of space because it stores data in the form of a two-dimensional table.

Non-relational database:

• The efficiency of storing data is relatively high;

• is not special Safe, sudden power outage can cause data loss.

Database

1. Definition

Database can be simply explained as: An efficient medium for storing and processing data (mainly divided into For disk and memory) .

2. Classification

According to different database storage media, it can be divided into two categories: relational database (SQL) and non-relational database (NoSQL, Not Only SQL) .

3. Example

Relational database:

• Large-scale: Oracle, DB2, etc.;

• Medium: SQL Server, MySQL, etc.;

• Small: Access, etc.

Non-relational databases:

• Memcached, MongoDB and Redis, etc.

4. Difference

Relational database:

• Safe, it saves data to disk and is basically unsafe Data loss may occur;

• is a waste of space because it stores data in the form of a two-dimensional table.

Non-relational database:

• The efficiency of storing data is relatively high;

• is not special Safe, sudden power outage can cause data loss.

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