SQL/MySQL/Join/Join Order

JOIN two tables with conditions and order

   <source lang="sql">

/* 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(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, 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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