CREATE DATABASE db_test;

USE db_test;

CREATE TABLE USER(

    uid INT PRIMARY KEY AUTO_INCREMENT,

    username VARCHAR(30) NOT NULL,

    PASSWORD VARCHAR(30) NOT NULL,

    uname VARCHAR(10) NOT NULL,

    phone VARCHAR(11) UNIQUE 

)

/*

資料庫增加

*/

INSERT INTO USER(uid,username,PASSWORD,uname,phone)

    VALUES(NULL,"馬文飛","123456","馬文飛","16637809505");
 

INSERT INTO USER(uid,username,PASSWORD,uname,phone)

    VALUES(NULL,"翟華兵","123456","翟華兵","16637809506");

/*

資料庫更改

*/

UPDATE USER SET phone = "16637801234" WHERE uid = 2;

/*

資料庫刪除

*/

DELETE FROM USER;

DELETE FROM USER WHERE uname = "馬文飛"; 

#將這張表刪除，再建立一個新表，是新的主鍵索引

TRUNCATE TABLE USER;

/*

檢視資料庫

*/

SELECT uname,phone FROM USER;
 

SELECT uname,phone FROM USER WHERE uid = "1";

SELECT MAX(uid) FROM USER;

SELECT MIN(uid) FROM USER;

SELECT SUM(uid) FROM USER;

SELECT AVG(uid) FROM USER;

SELECT COUNT(uid) FROM USER;

#按照uid降序排列

SELECT * FROM USER ORDER BY uid DESC;

SELECT * FROM USER ORDER BY uid ;