JOIN two tables with conditions and order : Join Order : Join SQL / MySQL


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JOIN two tables with conditions and order



/*

mysql> SELECT ArticleTitle, Copyright, ab.AuthID
    -> FROM Articles AS b JOIN AuthorArticle AS ab
    ->    ON b.ArticleID=ab.ArticleID
    -> WHERE Copyright<1980
    -> ORDER BY ArticleTitle;
+-------------------+-----------+--------+
| ArticleTitle      | Copyright | AuthID |
+-------------------+-----------+--------+
| Buy a paper       |      1932 |   1008 |
| Buy a paper       |      1932 |   1011 |
| How write a paper |      1934 |   1009 |
| Sell a paper      |      1966 |   1006 |
+-------------------+-----------+--------+
4 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(60NOT 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 (AuthIDREFERENCES Authors (AuthID),
   FOREIGN KEY (ArticleIDREFERENCES Articles (ArticleID)
)
ENGINE=INNODB;


INSERT INTO AuthorArticle VALUES (100614356)
                              (100815729)
                              (100912786)
                              (101017695),
                              (101115729)
                              (101219264)
                              (101219354)
                              (101416284);
  
SELECT ArticleTitle, Copyright, ab.AuthID
FROM Articles AS b JOIN AuthorArticle AS ab
   ON b.ArticleID=ab.ArticleID
WHERE Copyright<1980
ORDER BY ArticleTitle;



           
       



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