Simple table join : Simple JOIN « Join « SQL / MySQL

1. SQL / MySQL
2. Join
3. Simple JOIN

Simple table join

  
/*
mysql> CREATE TABLE Articles (
    ->    ArticleID SMALLINT NOT NULL PRIMARY KEY,
    ->    ArticleTitle VARCHAR(60) NOT NULL,
    ->    Copyright YEAR NOT NULL
    -> )
    -> ENGINE=INNODB;
Query OK, 0 rows affected (0.13 sec)

mysql> 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);
Query OK, 8 rows affected (0.08 sec)
Records: 8  Duplicates: 0  Warnings: 0

mysql> CREATE TABLE Authors (
    ->    AuthID SMALLINT NOT NULL PRIMARY KEY,
    ->    AuthorFirstName VARCHAR(20),
    ->    AuthorMiddleName VARCHAR(20),
    ->    AuthorLastName VARCHAR(20)
    -> )
    -> ENGINE=INNODB;
Query OK, 0 rows affected (0.16 sec)

mysql> 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');
Query OK, 9 rows affected (0.03 sec)
Records: 9  Duplicates: 0  Warnings: 0

mysql> 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;
Query OK, 0 rows affected (0.23 sec)

mysql> INSERT INTO AuthorArticle VALUES (1006, 14356),
    ->                               (1008, 15729),
    ->                               (1009, 12786),
    ->                               (1010, 17695),
    ->                               (1011, 15729),       (1012, 19264),
    ->                               (1012, 19354),
    ->                               (1014, 16284);
Query OK, 8 rows affected (0.07 sec)
Records: 8  Duplicates: 0  Warnings: 0

mysql> SELECT ArticleTitle, Copyright, AuthID
    -> FROM Articles AS b, AuthorArticle AS ab
    -> WHERE b.ArticleID=ab.ArticleID
    -> ORDER BY ArticleTitle;
+-------------------+-----------+--------+
| ArticleTitle      | Copyright | AuthID |
+-------------------+-----------+--------+
| AI                |      1993 |   1012 |
| Buy a paper       |      1932 |   1008 |
| Buy a paper       |      1932 |   1011 |
| Conferences       |      1996 |   1014 |
| How write a paper |      1934 |   1009 |
| Information       |      1992 |   1012 |
| Journal           |      1980 |   1010 |
| Sell a paper      |      1966 |   1006 |
+-------------------+-----------+--------+
8 rows in set (0.02 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 ArticleTitle, Copyright, AuthID
FROM Articles AS b, AuthorArticle AS ab
WHERE b.ArticleID=ab.ArticleID
ORDER BY ArticleTitle;

           
         
    
  

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