|
/*
mysql> Select * from Authors;
+--------+-----------------+------------------+----------------+
| AuthID | AuthorFirstName | AuthorMiddleName | AuthorLastName |
+--------+-----------------+------------------+----------------+
| 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 | Watts |
| 1013 | Alan | NULL | Wang |
| 1014 | Nelson | NULL | Yin |
+--------+-----------------+------------------+----------------+
9 rows in set (0.01 sec)
mysql> DELETE ab, b
-> FROM Authors AS a INNER JOIN AuthorArticle AS ab ON a.AuthID=ab.AuthID
-> INNER JOIN Articles AS b ON ab.ArticleID=b.ArticleID
-> WHERE AuthorLastName='Tom';
Query OK, 0 rows affected (0.01 sec)
mysql> Select * from Authors;
+--------+-----------------+------------------+----------------+
| AuthID | AuthorFirstName | AuthorMiddleName | AuthorLastName |
+--------+-----------------+------------------+----------------+
| 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 | Watts |
| 1013 | Alan | NULL | Wang |
| 1014 | Nelson | NULL | Yin |
+--------+-----------------+------------------+----------------+
9 rows in set (0.00 sec)
*/
Drop table Articles;
Drop table Authors;
Drop table AuthorArticle;
CREATE TABLE Articles (
ArticleID SMALLINT NOT NULL PRIMARY KEY,
ArticleTitle VARCHAR(60) NOT NULL,
Copyright YEAR NOT NULL
)
ENGINE=INNODB;
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);
CREATE TABLE Authors (
AuthID SMALLINT NOT NULL PRIMARY KEY,
AuthorFirstName VARCHAR(20),
AuthorMiddleName VARCHAR(20),
AuthorLastName VARCHAR(20)
)
ENGINE=INNODB;
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');
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;
INSERT INTO AuthorArticle VALUES (1006, 14356),
(1008, 15729),
(1009, 12786),
(1010, 17695),
(1011, 15729),
(1012, 19264),
(1012, 19354),
(1014, 16284);
Select * from Authors;
DELETE ab, b
FROM Authors AS a INNER JOIN AuthorArticle AS ab ON a.AuthID=ab.AuthID
INNER JOIN Articles AS b ON ab.ArticleID=b.ArticleID
WHERE AuthorLastName='Tom';
Select * from Authors;
|