Concatenation can be useful for modifying column values "in place." : CONCAT « String « SQL / MySQL

1. SQL / MySQL
2. String
3. CONCAT

Concatenation can be useful for modifying column values "in place."

       
mysql>
mysql> CREATE TABLE mytable
    -> (
    ->  name    VARCHAR(20)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql> INSERT INTO mytable (name)
    ->  VALUES
    ->          ('copper'),
    ->          ('gold'),
    ->          ('iron'),
    ->          ('lead'),
    ->          ('mercury'),
    ->          ('platinum'),
    ->          ('silver'),
    ->          ('tin')
    -> ;
Query OK, 8 rows affected (0.00 sec)
Records: 8  Duplicates: 0  Warnings: 0

mysql>
mysql> SELECT * FROM mytable;
+----------+
| name     |
+----------+
| copper   |
| gold     |
| iron     |
| lead     |
| mercury  |
| platinum |
| silver   |
| tin      |
+----------+
8 rows in set (0.00 sec)

mysql>
mysql>
mysql> UPDATE mytable SET name = CONCAT(name,'ide');
Query OK, 8 rows affected (0.00 sec)
Rows matched: 8  Changed: 8  Warnings: 0

mysql>
mysql> SELECT name FROM mytable;
+-------------+
| name        |
+-------------+
| copperide   |
| goldide     |
| ironide     |
| leadide     |
| mercuryide  |
| platinumide |
| silveride   |
| tinide      |
+-------------+
8 rows in set (0.00 sec)

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

   
    
    
    
    
    
    
  

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