MySQL笔记：数据插入

Posted 2020-10-27 arseneyao

一、插入记录

CREATE DATABASE MYDB;
USE MYDB;

CREATE TABLE IDENTITY (
  NAME  CHAR(20) PRIMARY KEY,
  BIRTH DATETIME NOT NULL,
  HOME  CHAR(20)
);

CREATE TABLE STUDENT (
  NUMBER INT PRIMARY KEY AUTO_INCREMENT,
  NAME   CHAR(20) NOT NULL,
  AGE    TINYINT  NOT NULL,
  HOME   CHAR(30)
);

INSERT INTO STUDENT VALUES (30, ‘Curry‘, 10, ‘Golden State‘); #不指定字段名
INSERT INTO STUDENT (NAME, AGE, HOME) VALUES (‘Durant‘, 11, ‘Golden State‘); #指定字段名

INSERT INTO STUDENT (NAME, AGE, HOME) VALUES
  (‘Curry‘, 30, ‘Golden State‘),
  (‘Durant‘, 29, ‘Golden State‘),
  (‘James‘, 23, ‘Cleveland‘),
  (‘Irving‘, 11, ‘Boston‘); #插入多条记录

INSERT INTO STUDENT (NAME, AGE, HOME)
  SELECT
    NAME,
    TIMEDIFF(NOW(), BIRTH),
    HOME
  FROM IDENTITY; #插入查询结果

SELECT *
FROM STUDENT;

DROP DATABASE MYDB;

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二、更新记录

INSERT INTO STUDENT VALUES (35, ‘Durant‘, 0, 29, ‘Oklahoma‘);
UPDATE STUDENT
SET HOME = ‘Golden State‘
WHERE NUMBER = 35;

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三、删除记录

DELETE FROM STUDENT
WHERE HOME = ‘Golden State‘; #清除指定条件的数据
DELETE FROM STUDENT; #清空所有数据

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