Creating Unions That Join : Union « Select Clause « SQL / MySQL

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

Creating Unions That Join

   
mysql>
mysql> CREATE TABLE Books
    -> (
    ->     BookID SMALLINT NOT NULL PRIMARY KEY,
    ->     BookTitle VARCHAR(60) NOT NULL,
    ->     Copyright YEAR NOT NULL
    -> )
    -> ENGINE=INNODB;
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO Books VALUES
    -> (12786, 'Notebook', 1934),
    -> (13331, 'C++', 1919),
    -> (14356, 'Opera', 1966),
    -> (15729, 'Sql Server', 1932),
    -> (16284, 'C', 1996),
    -> (17695, 'Pascal', 1980),
    -> (19264, 'Postcards', 1992),
    -> (19354, 'Oracle', 1993);
Query OK, 8 rows affected (0.00 sec)
Records: 8  Duplicates: 0  Warnings: 0

mysql>
mysql>
mysql> CREATE TABLE Authors
    -> (
    ->     AuthID SMALLINT NOT NULL PRIMARY KEY,
    ->     AuthFN VARCHAR(20),
    ->     AuthMN VARCHAR(20),
    ->     AuthLN VARCHAR(20)
    -> )
    -> ENGINE=INNODB;
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO Authors VALUES
    -> (1006, 'Hunter', 'S.', 'Thompson'),
    -> (1007, 'Joyce', 'Carol', 'Oates'),
    -> (1008, 'Black', NULL, 'Elk'),
    -> (1009, 'Rainer', 'Maria', 'Rilke'),
    -> (1010, 'John', 'Kennedy', 'Toole'),
    -> (1011, 'John', 'G.', 'Neihardt'),
    -> (1012, 'Annie', NULL, 'Proulx'),
    -> (1013, 'Alan', NULL, 'Watts'),
    -> (1014, 'Nelson', NULL, 'Algren');
Query OK, 9 rows affected (0.00 sec)
Records: 9  Duplicates: 0  Warnings: 0

mysql>
mysql>
mysql> CREATE TABLE AuthorBook
    -> (
    ->     BookID SMALLINT NOT NULL,
    ->     AuthID SMALLINT NOT NULL,
    ->     PRIMARY KEY (AuthID, BookID)
    -> )
    -> ENGINE=INNODB;
Query OK, 0 rows affected (0.01 sec)

mysql>
mysql> INSERT INTO AuthorBook VALUES
    -> (1006, 14356),
    -> (1008, 15729),
    -> (1009, 12786),
    -> (1010, 17695),
    -> (1011, 15729),
    -> (1012, 19264),
    -> (1012, 19354),
    -> (1014, 16284);
Query OK, 8 rows affected (0.00 sec)
Records: 8  Duplicates: 0  Warnings: 0

mysql>
mysql>
mysql>
mysql> CREATE TABLE Authors2
    -> (
    ->     AuthID SMALLINT NOT NULL PRIMARY KEY,
    ->     AuthFN VARCHAR(20),
    ->     AuthMN VARCHAR(20),
    ->     AuthLN VARCHAR(20)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql>
mysql> INSERT INTO Authors2 VALUES
    -> (1006, 'Mark', NULL, 'Twain'),
    -> (2205, 'E.', 'M.', 'Forster'),
    -> (2206, 'Gabriel', 'Garcia', 'Marquez'),
    -> (2207, 'Raymond', NULL, 'Carver'),
    -> (2208, 'Mary', NULL, 'Shelley'),
    -> (2209, 'Albert', NULL, 'Camus');
Query OK, 6 rows affected (0.00 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql>
mysql> SELECT AuthFN, AuthMN, AuthLN FROM Authors
    -> UNION
    -> SELECT AuthFN, AuthMN, AuthLN FROM Authors2;
+---------+---------+----------+
| AuthFN  | AuthMN  | AuthLN   |
+---------+---------+----------+
| Hunter  | S.      | Thompson |
| Joyce   | Carol   | Oates    |
| Black   | NULL    | Elk      |
| Rainer  | Maria   | Rilke    |
| John    | Kennedy | Toole    |
| John    | G.      | Neihardt |
| Annie   | NULL    | Proulx   |
| Alan    | NULL    | Watts    |
| Nelson  | NULL    | Algren   |
| Mark    | NULL    | Twain    |
| E.      | M.      | Forster  |
| Gabriel | Garcia  | Marquez  |
| Raymond | NULL    | Carver   |
| Mary    | NULL    | Shelley  |
| Albert  | NULL    | Camus    |
+---------+---------+----------+
15 rows in set (0.00 sec)

mysql>
mysql>
mysql> drop table Books;
Query OK, 0 rows affected (0.00 sec)

mysql> drop table Authors;
Query OK, 0 rows affected (0.00 sec)

mysql> drop table Authors2;
Query OK, 0 rows affected (0.00 sec)

mysql> drop table AuthorBook;
Query OK, 0 rows affected (0.00 sec)

mysql>

   
    
    
  

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