Detailed introduction to storage requirements

Python comes with a lightweight relational database SQLite. This database uses SQL language. As a back-end database, SQLite can be used with Python to build websites or create tools that require data storage. SQLite is also widely used in other fields, such as HTML5 and mobile terminals. sqlite3 in the Python standard library provides an interface to this database. I will create a simple relational database to store book categories and prices for a bookstore. The database contains two tables: category is used to record classification, and book is used to record information about a certain book. A book belongs to a certain category, so book has a foreign key that points to the primary key id of the catogory table. Create the database I first create the database and the tables in the database. After using connect() to connect to the database, I can execute SQL commands by positioning the pointer cursor: # By Vamei import sqlite3 # test.db 

1. Detailed explanation of Python database sqlite3 application method

##Introduction: Python comes with a lightweight relational database SQLite. This database uses SQL language. As a back-end database, SQLite can be used with Python to build websites or create tools that require data storage. SQLite is also widely used in other fields, such as HTML5 and mobile terminals. sqlite3 in the Python standard library provides an interface to this database. I will create a simple relational database for

2. MySQL Basics Tutorial 4 - Storage Requirements of Data Types and How to Choose the Correct Type

Introduction: 1. Column type storage requirements lists the storage requirements for each column type supported by MySQL according to category. The maximum size of a row in a MyISAM table is 65,534 bytes. Each BLOB and TEXT column accounts for only 5 to 9 bytes. If the MyISAM table package...

3. MySQL data type storage requirements and how to choose the correct type

Introduction: The maximum size of a row in a MyISAM table is 65,534 bytes. Each BLOB and TEXT column accounts for only 5 to 9 bytes of it. If the MyISAM table includes variable-length column types, the record format is also variable-length. When creating a table, MySQL can change a column from a variable-length type to a fixed-length type or vice versa, under certain conditions.

4. Python Standard Library 14 Database (sqlite3)

Introduction: Python comes with a lightweight relational database SQLite. This database uses SQL language. As a back-end database, SQLite can be used with Python to build websites or create tools that require data storage. SQLite is also widely used in other fields, such as HTML5 and mobile terminals. sqlite3 in the Python standard library provides an interface to this database.

5. More detailed description of MySQL field types

Introduction: MySQL supports a large number of column types, it can Are divided into 3 categories: numeric types, date and time types, and string (character) types. This section first gives an overview of the available types and summarizes the storage requirements of each column type, and then provides a more detailed description of the nature of the types in each class. The overview is intentionally simplified, more detailed instructions should be considered regarding specific column types

6. Take full advantage of DB2 9.7's deduplication device support

Introduction: Data deduplication can significantly improve the database environment by minimizing storage requirements, accelerating backup and recovery, and reducing network traffic. However, until the release of DB2 v9.7 FixPack 3, if you need to optimize a DB2 backup image for a deduplication device, you must set multiple BACKUP DATABASE command options appropriately. Otherwise, the backup target will be restored.

7. Redis Research (1)—Introduction

Introduction: Redis is an open source, high-performance key pair database. It provides a variety of key data types to adapt to storage needs in different scenarios, and uses many high-level interfaces to make it capable of different roles such as caching and queuing systems. 1.1 History and development In 2008, Salvatore Sanfilippo, the founder of Merzia, an Italian startup company, in order to avoid MySQL

8. mysql data types and usage

Introduction: Welcome to the Linux Community Forum, interact with 2 million technical staff> Enter MySQL to support multiple column types: numeric type, date/time type and string (character) type. This chapter begins with an overview of these column types, then describes the various column types in more detail, along with a summary of the column type storage requirements. The overview is simple. About specific column types

9. MySQL field type description_MySQL

Introduction: MySQL supports a large number of column types , which can be divided into 3 categories: numeric types, date and time types, and string (character) types. This section first gives an overview of the available types and summarizes the storage requirements of each column type, and then provides a more detailed description of the nature of the types in each class. The overview is intentionally simplified, and a more detailed description should take into account additional information about specific column types

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