Adding Subqueries to Your UPDATE Statements : Update « Insert Delete Update « SQL / MySQL






  1. SQL / MySQL
  2. Insert Delete Update
  3. Update

Adding Subqueries to Your UPDATE Statements

     
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> INSERT INTO Books VALUES (21356, 'Tao: The Watercourse Way', 1975);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO AuthorBook VALUES (1013, 21356);
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> UPDATE Books
    -> SET BookTitle='The Way of Zen', Copyright=1957
    -> WHERE BookID=
    -> (
    -> SELECT ab.BookID
    -> FROM Authors AS a, AuthorBook AS ab
    -> WHERE a.AuthID=ab.AuthID AND a.AuthLN='Watts'
    -> );
Query OK, 0 rows affected (0.00 sec)

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 AuthorBook;
Query OK, 0 rows affected (0.00 sec)








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