Using math function in HAVING : Group « Select Clause « SQL / MySQL






  1. SQL / MySQL
  2. Select Clause
  3. Group

Using math function in HAVING 

   
/*

mysql> SELECT OrderID, SUM(Quantity) AS Total
    -> FROM ArticleOrders
    -> GROUP BY OrderID
    -> HAVING Total>(SELECT AVG(Quantity) FROM ArticleOrders);
+---------+-------+
| OrderID | Total |
+---------+-------+
|     101 |     4 |
|     102 |     4 |
|     103 |     6 |
|     105 |     3 |
|     106 |     3 |
|     107 |     3 |
|     108 |     5 |
|     110 |     6 |
|     111 |     2 |
+---------+-------+
9 rows in set (0.05 sec)


*/

Drop table Articles;
Drop table Authors;
Drop table AuthorArticle;
Drop table ArticleOrders;


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);
CREATE TABLE ArticleOrders
(
   OrderID SMALLINT NOT NULL,
   ArticleID SMALLINT NOT NULL,
   Quantity SMALLINT NOT NULL,
   PRIMARY KEY (OrderID, ArticleID),
   FOREIGN KEY (ArticleID) REFERENCES Articles (ArticleID)
)
ENGINE=INNODB;


INSERT INTO ArticleOrders VALUES (101, 13331, 1), 
                                 (101, 12786, 1), 
                                 (101, 16284, 2), 
                                 (102, 19354, 1),
                                 (102, 15729, 3), 
                                 (103, 12786, 2), 
                                 (103, 19264, 1), 
                                 (103, 13331, 1),
                                 (103, 14356, 2), 
                                 (104, 19354, 1), 
                                 (105, 15729, 1), 
                                 (105, 14356, 2),
                                 (106, 16284, 2), 
                                 (106, 13331, 1), 
                                 (107, 12786, 3), 
                                 (108, 19354, 1),
                                 (108, 16284, 4), 
                                 (109, 15729, 1), 
                                 (110, 13331, 2), 
                                 (110, 12786, 2),
                                 (110, 14356, 2), 
                                 (111, 14356, 2);
  
SELECT OrderID, SUM(Quantity) AS Total
FROM ArticleOrders
GROUP BY OrderID
HAVING Total>(SELECT AVG(Quantity) FROM ArticleOrders);








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