/*
mysql> SELECT ArticleID, ArticleTitle
??? -> FROM Articles AS b
??? -> WHERE EXISTS
??? ->??? (
??? ->?????? SELECT ArticleID
??? ->?????? FROM AuthorArticle AS ab
??? ->?????? WHERE b.ArticleID=ab.ArticleID
??? ->??? )
??? -> ORDER BY ArticleTitle;
+-----------+-------------------+
| ArticleID | ArticleTitle????? |
+-----------+-------------------+
|???? 19354 | AI??????????????? |
|???? 15729 | Buy a paper?????? |
|???? 16284 | Conferences?????? |
|???? 12786 | How write a paper |
|???? 19264 | Information?????? |
|???? 17695 | Journal?????????? |
|???? 14356 | Sell a paper????? |
+-----------+-------------------+
7 rows in set (0.01 sec)
*/??????
Drop table Articles;
Drop table Authors;
Drop table AuthorArticle;MYSQL應(yīng)用

CREATE TABLE Articles (
?? ArticleID SMALLINT NOT NULL PRIMARY KEY,
?? ArticleTitle VARCHAR(60) NOT NULL,
?? Copyright YEAR NOT NULL
)
ENGINE=INNODB;MYSQL應(yīng)用

INSERT INTO Articles VALUES (12786, 'How write a paper', 1934),
??????????????????????????? (13331, 'Publish a paper', 1919),
??????????????????????????? (14356, 'Sell a paper', 1966),
??????????????????????????? (15729, 'Buy a paper', 1932),
??????????????????????????? (16284, 'Conferences', 1996),
??????????????????????????? (17695, 'Journal', 1980),
??????????????????????????? (19264, 'Information', 1992),
??????????????????????????? (19354, 'AI', 1993);MYSQL應(yīng)用

CREATE TABLE Authors (
?? AuthID SMALLINT NOT NULL PRIMARY KEY,
?? AuthorFirstName VARCHAR(20),
?? AuthorMiddleName VARCHAR(20),
?? AuthorLastName VARCHAR(20)
)
ENGINE=INNODB;MYSQL應(yīng)用

INSERT INTO Authors VALUES (1006, 'Henry', 'S.', 'Thompson'),
?????????????????????????? (1007, 'Jason', 'Carol', 'Oak'),
?????????????????????????? (1008, 'James', NULL, 'Elk'),
?????????????????????????? (1009, 'Tom', 'M', 'Ride'),
?????????????????????????? (1010, 'Jack', 'K', 'Ken'),
?????????????????????????? (1011, 'Mary', 'G.', 'Lee'),
?????????????????????????? (1012, 'Annie', NULL, 'Peng'),
?????????????????????????? (1013, 'Alan', NULL, 'Wang'),
?????????????????????????? (1014, 'Nelson', NULL, 'Yin');MYSQL應(yīng)用

CREATE TABLE AuthorArticle (
?? AuthID SMALLINT NOT NULL,
?? ArticleID SMALLINT NOT NULL,
?? PRIMARY KEY (AuthID, ArticleID),
?? FOREIGN KEY (AuthID) REFERENCES Authors (AuthID),
?? FOREIGN KEY (ArticleID) REFERENCES Articles (ArticleID)
)
ENGINE=INNODB;MYSQL應(yīng)用

INSERT INTO AuthorArticle VALUES (1006, 14356),
????????????????????????????? (1008, 15729),
????????????????????????????? (1009, 12786),
????????????????????????????? (1010, 17695),
????????????????????????????? (1011, 15729),
????????????????????????????? (1012, 19264),
????????????????????????????? (1012, 19354),
????????????????????????????? (1014, 16284);
?MYSQL應(yīng)用

SELECT ArticleID, ArticleTitle
FROM Articles AS b
WHERE EXISTS
?? (
????? SELECT ArticleID
????? FROM AuthorArticle AS ab
????? WHERE b.ArticleID=ab.ArticleID
?? )
ORDER BY ArticleTitle;