SQL数据库常用命令

数据库操作：

创建库：create database 数据库名

删除库：drop database 数据库名

选择库：use 数据库名 Database changed

关闭安全模式：set sql_safe_updates = 0;

表操作：

创建表：CREATE TABLE table_name (column_name column_type);

删除表：DROP TABLE table_name;

查询表数据：SELECT*FROM table_name;查看整个表数据

SELECT comlun_name comlun_name from table_name;查看表指定模块数据

插入：insert into

语法：INSERT INTO table_name

VALUES (value1,value2,value3,...);

INSERT INTO table_name (column1,column2,column3,...)
VALUES (value1,value2,value3,...);

INSERT INTO table_name ( field1, field2,...fieldN )

VALUES

( value1, value2,...valueN );

INSERT INTO table_name (field1, field2,...fieldN) VALUES (valueA1,valueA2,...valueAN),(valueB1,valueB2,...valueBN),(valueC1,valueC2,...valueCN)......;

AUTO_INCREMENT(自动增加) 属性

INSERT INTO Websites (name, url, alexa, country) VALUES ('百度','https://www.baidu.com/','4','CN');

删除delete

语法：DELETE FROM table_name
WHERE some_column=some_value;

DELETE FROM Websites WHERE name='Facebook' AND country='USA';

更新：update

语法：UPDATE table_name
SET column1=value1,column2=value2,...
WHERE some_column=some_value;

UPDATE Websites SET alexa='5000', country='USA' WHERE name='菜鸟教程';

查询：where

语法：SELECT column_name,column_name
FROM table_name
WHERE column_name operator value;

SELECT * FROM Websites WHERE country='CN';

巴特西

SQL数据库常用命令

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