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Re: correct order by for logical output
Posted by: Paul McArdle
Date: July 13, 2005 03:12AM

some experimentation.
mysql> select * from words
-> ;
+----+------+
| id | name |
+----+------+
| 1 | 1 |
| 2 | 1a |
| 3 | 2b |
| 4 | 2a |
| 5 | 2 |
| 6 | 1.1 |
| 7 | 1.1a |
| 8 | 1.2b |
| 9 | 1.2a |
| 10 | 1.2 |
+----+------+
10 rows in set (0.03 sec)

mysql> select * from words order by name;
+----+------+
| id | name |
+----+------+
| 1 | 1 |
| 6 | 1.1 |
| 7 | 1.1a |
| 10 | 1.2 |
| 9 | 1.2a |
| 8 | 1.2b |
| 2 | 1a |
| 5 | 2 |
| 4 | 2a |
| 3 | 2b |
+----+------+
10 rows in set (0.02 sec)

mysql> select * from words order by left(name,2);
+----+------+
| id | name |
+----+------+
| 1 | 1 |
| 6 | 1.1 |
| 7 | 1.1a |
| 8 | 1.2b |
| 9 | 1.2a |
| 10 | 1.2 |
| 2 | 1a |
| 5 | 2 |
| 4 | 2a |
| 3 | 2b |
+----+------+
10 rows in set (0.02 sec)

mysql> select * from words order by left(name,3);
+----+------+
| id | name |
+----+------+
| 1 | 1 |
| 6 | 1.1 |
| 7 | 1.1a |
| 8 | 1.2b |
| 9 | 1.2a |
| 10 | 1.2 |
| 2 | 1a |
| 5 | 2 |
| 4 | 2a |
| 3 | 2b |
+----+------+
10 rows in set (0.02 sec)

mysql> select * from words order by left(name,4);
+----+------+
| id | name |
+----+------+
| 1 | 1 |
| 6 | 1.1 |
| 7 | 1.1a |
| 10 | 1.2 |
| 9 | 1.2a |
| 8 | 1.2b |
| 2 | 1a |
| 5 | 2 |
| 4 | 2a |
| 3 | 2b |
+----+------+
10 rows in set (0.03 sec)

mysql> select * from words order by left(name,0);
+----+------+
| id | name |
+----+------+
| 1 | 1 |
| 2 | 1a |
| 3 | 2b |
| 4 | 2a |
| 5 | 2 |
| 6 | 1.1 |
| 7 | 1.1a |
| 8 | 1.2b |
| 9 | 1.2a |
| 10 | 1.2 |
+----+------+
10 rows in set (0.02 sec)

mysql> select * from words order by name;
+----+------+
| id | name |
+----+------+
| 1 | 1 |
| 6 | 1.1 |
| 7 | 1.1a |
| 10 | 1.2 |
| 9 | 1.2a |
| 8 | 1.2b |
| 2 | 1a |
| 5 | 2 |
| 4 | 2a |
| 3 | 2b |
+----+------+
10 rows in set (0.10 sec)

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Re: correct order by for logical output
July 13, 2005 03:12AM


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