Understanding of database architecture

One 、 Three modes of database
  Internal mode , External mode , Pattern

The internal schema is equivalent to a series of things stored in the database , Like bytes , Talk about how data is stored in the database , It can also be called storage mode ;

External mode refers to the addition, deletion, modification and query of data structure and data in the database by a single user , It can also be called operation mode ;

A schema is an overall logical description of a database , It is a collection of transactions that all users can see in the database , It can also be called conceptual pattern .

-- I hope you can give full play to your opinions , I feel there is something wrong with my understanding

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Take the answer ：

Your understanding is ok , Internal mode general database has been implemented , In most cases, deep understanding is not required , Unless you want to develop a new database yourself , External mode is commonly used by users , Create a library , Create table , Data addition, deletion, modification and query .

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