要操作表首先需要选定数据库,因为表是存在于数据库内的;表的基本操作包括:创建表、显示表、查看表基本结构、查看表详细结构以及删除表等等,需要了解的朋友可以参考下
要操作表首先需要选定数据库,因为表是存在于数据库内的选择数据库
mysql> use school;
Database changed
选择好数据库之后,我们就可以在此数据库之中创建表了
创建表
mysql> create table student(
-> id int,
-> name varchar(20),
-> sex boolean
-> );
Query OK, 0 rows affected (0.11 sec)
create table用于创建表,后面接表名称
括号内写的是字段名称和类型,逗号隔开,需要说明的是varchar是可变长度的字符串
这里的5行也可以写成一行,之所以这么写是为了清晰度
显示表
代码如下:
mysql> show tables;
+------------------+
| Tables_in_school |
+------------------+
| student |
+------------------+
row in set (0.00 sec)
show tables可以显示当前数据库中的所有表
查看表基本结构
代码如下:
mysql> describe student;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id | int(11) | YES | | NULL | |
| name | varchar(20) | YES | | NULL | |
| sex | tinyint(1) | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
rows in set (0.00 sec)
这里显示了字段、数据类型、是否为空、主外键、默认值和额外信息
describe还可以简写成desc
其实大部分sql语句都能简写为四个字符的形式
需要注意的是:刚刚写的sex为boolean类型,会自动转换为tinyint类型
查看表详细结构
代码如下:
mysql> show create table student\G
*************************** 1. row ***************************
Table: student
Create Table: CREATE TABLE `student` (
`id` int(11) DEFAULT NULL,
`name` varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
row in set (0.00 sec)
show create table能显示创建表时的详细信息
末尾后的\G是为了显示更美观
tips:在显示比较长的信息时,\G结尾尤其有效
删除表
mysql> drop table student;
Query OK, 0 rows affected (0.02 sec)
删除表的操作和删除数据库的操作差不多
都是使用drop命令,删除完成后便可使用show tables查看余下表

This article explores optimizing MySQL memory usage in Docker. It discusses monitoring techniques (Docker stats, Performance Schema, external tools) and configuration strategies. These include Docker memory limits, swapping, and cgroups, alongside

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

This article addresses MySQL's "unable to open shared library" error. The issue stems from MySQL's inability to locate necessary shared libraries (.so/.dll files). Solutions involve verifying library installation via the system's package m

This article compares installing MySQL on Linux directly versus using Podman containers, with/without phpMyAdmin. It details installation steps for each method, emphasizing Podman's advantages in isolation, portability, and reproducibility, but also

This article provides a comprehensive overview of SQLite, a self-contained, serverless relational database. It details SQLite's advantages (simplicity, portability, ease of use) and disadvantages (concurrency limitations, scalability challenges). C

This guide demonstrates installing and managing multiple MySQL versions on macOS using Homebrew. It emphasizes using Homebrew to isolate installations, preventing conflicts. The article details installation, starting/stopping services, and best pra

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

WebStorm Mac version
Useful JavaScript development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SublimeText3 Chinese version
Chinese version, very easy to use

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

Dreamweaver Mac version
Visual web development tools
