Using the REPLACE Statement to Copy Data : Copy Table « Table Index « SQL / MySQL

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Using the REPLACE Statement to Copy Data

    
mysql>
mysql>
mysql> CREATE TABLE CDs
    -> (
    ->     CDID SMALLINT NOT NULL PRIMARY KEY,
    ->     CDName VARCHAR(50) NOT NULL,
    ->     InStock SMALLINT UNSIGNED NOT NULL,
    ->     Category VARCHAR(20)
    -> );
mysql>
mysql> INSERT INTO CDs VALUES
    -> (101, 'Xml', 10, 'Rock'),
    -> (102, 'SQL', 17, 'Jazz'),
    -> (103, 'MySQL', 9, 'Classical'),
    -> (104, 'CSS', 24, NULL),
    -> (105, 'Oracle', 2, 'Blues'),
    -> (106, 'Data type', 12, 'Country'),
    -> (107, 'Flash', 5, 'New Age'),
    -> (108, 'Photoshop', 42, 'Classical'),
    -> (109, 'MacBook', 20, 'Opera'),
    -> (110, 'Notebook', 23, 'Country'),
    -> (111, 'Pascal', 18, 'Jazz'),
    -> (112, 'Ruby', 22, 'Blues'),
    -> (113, 'C', 42, 'Blues');
mysql>
mysql>
mysql> CREATE TABLE CDs2
    -> (
    -> CDID SMALLINT NOT NULL PRIMARY KEY,
    -> CDName VARCHAR(5) NOT NULL,
    -> InStock SMALLINT UNSIGNED NOT NULL
    -> )
    -> SELECT CDID, CDName, InStock
    -> FROM CDs
    -> WHERE Category='Blues' OR Category='Jazz';
mysql>
mysql>
mysql> INSERT INTO CDs2
    -> SELECT CDID, CDName, InStock FROM CDs
    -> WHERE Category='Country' OR Category='Rock';

mysql>
mysql>
mysql>
mysql> REPLACE INTO CDs2
    -> SELECT CDID, CDName, InStock
    -> FROM CDs
    -> WHERE Category='Country' OR Category='Rock';
Query OK, 3 rows affected, 2 warnings (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 2

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

mysql> drop table CDs2;
Query OK, 0 rows affected (0.00 sec)

mysql>

   
    
    
    
  

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