mysql基本语法

2023-12-14 19:32:33

MySQL是一个流行的关系型数据库管理系统,以下是一些基本的MySQL语法:

创建数据库:

CREATE DATABASE database_name;


选择数据库:

USE database_name;


创建表:

CREATE TABLE table_name (
? ? column1 datatype,
? ? column2 datatype,
? ? ...
);


插入数据:

INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...);



查询数据:

SELECT column1, column2, ... FROM table_name WHERE condition;


更新数据:

UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;


删除数据:

DELETE FROM table_name WHERE condition;


选择所有数据:

SELECT * FROM table_name;

条件筛选:

SELECT column1, column2, ... FROM table_name WHERE condition1 AND/OR condition2;


排序:

SELECT column1, column2, ... FROM table_name ORDER BY column1 ASC/DESC;


聚合函数(求和、平均值等):

SELECT COUNT(column1), AVG(column2), SUM(column3) FROM table_name WHERE condition;


分组:

SELECT column1, COUNT(column2) FROM table_name GROUP BY column1;


连接表:

SELECT column1, column2, ... FROM table1 INNER JOIN table2 ON table1.column = table2.column;


删除表:

DROP TABLE table_name;


删除数据库:

DROP DATABASE database_name;

文章来源:https://blog.csdn.net/LforikQ/article/details/134911111
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