Question

我有两个名为authors和titles的表。我想列出已经写过儿童书籍和历史书籍的出版商的名字。

以下是两个表结构：

CREATE TABLE authors
  (
  au_id    CHAR(3)     NOT NULL,
  au_fname VARCHAR(15) NOT NULL,
  au_lname VARCHAR(15) NOT NULL,
  phone    VARCHAR(12)         ,
  address  VARCHAR(20)         ,
  city     VARCHAR(15)         ,
  state    CHAR(2)             ,
  zip      CHAR(5)             ,
  CONSTRAINT pk_authors PRIMARY KEY (au_id)
  )ENGINE = InnoDB;

INSERT INTO authors VALUES('A01','Sarah','Buchman','718-496-7223','75 West 205 St','Bronx','NY','10468');
INSERT INTO authors VALUES('A02','Wendy','Heydemark','303-986-7020','2922 Baseline Rd','Boulder','CO','80303');
INSERT INTO authors VALUES('A03','Hallie','Hull','415-549-4278','3800 Waldo Ave, #14F','San Francisco','CA','94123');
INSERT INTO authors VALUES('A04','Klee','Hull','415-549-4278','3800 Waldo Ave, #14F','San Francisco','CA','94123');
INSERT INTO authors VALUES('A05','Christian','Kells','212-771-4680','114 Horatio St','New York','NY','10014');
INSERT INTO authors VALUES('A06','','Kellsey','650-836-7128','390 Serra Mall','Palo Alto','CA','94305');
INSERT INTO authors VALUES('A07','Paddy','O''Furniture','941-925-0752','1442 Main St','Sarasota','FL','34236');

CREATE TABLE titles
  (
  title_id   CHAR(3)      NOT NULL,
  title_name VARCHAR(40)  NOT NULL,
  type       VARCHAR(10)          ,
  pub_id     CHAR(3)      NOT NULL,
  pages      INTEGER              ,
  price      DECIMAL(5,2)         ,
  sales      INTEGER              ,
  pubdate    DATE                 ,
  contract   SMALLINT     NOT NULL,
  CONSTRAINT pk_titles PRIMARY KEY (title_id)
  )ENGINE = InnoDB;

INSERT INTO titles VALUES('T01','1977!','history','P01',107,21.99,566,DATE '2000-08-01',1);
INSERT INTO titles VALUES('T02','200 Years of German Humor','history','P03',14,19.95,9566,DATE '1998-04-01',1);
INSERT INTO titles VALUES('T03','Ask Your System Administrator','computer','P02',1226,39.95,25667,DATE '2000-09-01',1);
INSERT INTO titles VALUES('T04','But I Did It Unconsciously','psychology','P04',510,12.99,13001,DATE '1999-05-31',1);
INSERT INTO titles VALUES('T05','Exchange of Platitudes','psychology','P04',201,6.95,201440,DATE '2001-01-01',1);
INSERT INTO titles VALUES('T06','How About Never?','biography','P01',473,19.95,11320,DATE '2000-07-31',1);
INSERT INTO titles VALUES('T07','I Blame My Mother','biography','P03',333,23.95,1500200,DATE '1999-10-01',1);
INSERT INTO titles VALUES('T08','Just Wait Until After School','children','P04',86,10.00,4095,DATE '2001-06-01',1);
INSERT INTO titles VALUES('T09','Kiss My Boo-Boo','children','P04',22,13.95,5000,DATE '2002-05-31',1);
INSERT INTO titles VALUES('T10','Not Without My Faberge Egg','biography','P01',NULL,NULL,NULL,NULL,0);
INSERT INTO titles VALUES('T11','Perhaps It''s a Glandular Problem','psychology','P04',826,7.99,94123,DATE '2000-11-30',1);
INSERT INTO titles VALUES('T12','Spontaneous, Not Annoying','biography','P01',507,12.99,100001,DATE '2000-08-31',1);
INSERT INTO titles VALUES('T13','What Are The Civilian Applications?','history','P03',802,29.99,10467,DATE '1999-05-31',1);

如何将两张桌子连在一起以获取必要的信息？

我不想使用内连接。

我试过，但这会返回一个空结果。

SELECT au_fname, au_lname
FROM authors
WHERE au_id IN
(SELECT pub_id
FROM titles
WHERE type='children'
OR type='history');

SQL - 在不使用INNER JOIN的情况下连接两个表

0 个答案: