Mega Code Archive
Testing String Equality or Relative Ordering
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mysql>
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> SELECT name, name = 'lead', name != 'lead' FROM mytable;
+----------+---------------+----------------+
| name | name = 'lead' | name != 'lead' |
+----------+---------------+----------------+
| copper | 0 | 1 |
| gold | 0 | 1 |
| iron | 0 | 1 |
| lead | 1 | 0 |
| mercury | 0 | 1 |
| platinum | 0 | 1 |
| silver | 0 | 1 |
| tin | 0 | 1 |
+----------+---------------+----------------+
8 rows in set (0.00 sec)
mysql> SELECT name, name < 'lead', name > 'lead' FROM mytable;
+----------+---------------+---------------+
| name | name < 'lead' | name > 'lead' |
+----------+---------------+---------------+
| copper | 1 | 0 |
| gold | 1 | 0 |
| iron | 1 | 0 |
| lead | 0 | 0 |
| mercury | 0 | 1 |
| platinum | 0 | 1 |
| silver | 0 | 1 |
| tin | 0 | 1 |
+----------+---------------+---------------+
8 rows in set (0.00 sec)
mysql>
mysql> drop table mytable;
Query OK, 0 rows affected (0.00 sec)
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