7mysql高级查询

CREATE DATABASE books CHARSET=utf8;
USE books;
CREATE TABLE book(
id INT PRIMARY KEY AUTO_INCREMENT,
title VARCHAR(50) NOT NULL,
author VARCHAR(30) NOT NULL,
publication VARCHAR(50),
price FLOAT,
COMMENT TEXT
);
INSERT INTO book (title,author,publication,price,COMMENT) VALUES
("边城","沈从文","机械工业出版社",36,'小城故事多'),
("骆驼祥子","老舍","中国教育出版社",43,'你是祥子吗'),
("茶馆","老舍","中国文学出版社",55,'老北京'),
("呐喊","鲁迅","中国教育出版社",72.5,'最后的声音'),
("围城","钱钟书","中国文学出版社",54,'你心中的围城是什么');
INSERT INTO book (
  title,
  author,
  publication,
  price
) 
VALUES
  (
    "林家埔子",
    "矛盾",
    "机械工业出版社",
    66
  ),
  (
    "朝花夕拾",
    "鲁迅",
    "中国文学出版社",
    55
  ) ;
SELECT * FROM book;

#查找30多元的
SELECT * FROM book WHERE price>=30 AND price<40;
#查找中国教育出版社的
SELECT * FROM book WHERE publication="中国教育出版社";
#查找老舍写的，中国文学出版社的
SELECT * FROM book WHERE author = "老舍" AND publication="中国文学出版社";
#查找备注不为空的
SELECT * FROM book WHERE COMMENT IS NOT NULL;
#查找价格超过60的，只看书名和价格
SELECT title,price FROM book WHERE price>60;
#查找鲁迅写的或者矛盾写的
SELECT * FROM book WHERE author="鲁迅" OR author="茅盾";