Код: Выделить всё
select
GREATEST
(
`rzd_1`, `rzd_2`, `rzd_3`, `rzd_3`, `rzd_5`, `rzd_6`
)
from
(
SELECT MAX( `rzd_1` ) AS `rzd_1` , MAX( `rzd_2` ) AS `rzd_2` , MAX(
`rzd_3` ) AS `rzd_3` , MAX( `rzd_4` ) AS `rzd_4` , MAX( `rzd_5` ) AS `rzd_5` , MAX( `rzd_6` ) AS `rzd_6` FROM `razdel_table`
)
AS `maximum`
Код: Выделить всё
mysql> SELECT GREATEST(2,0);
+---------------+
| GREATEST(2,0) |
+---------------+
| 2 |
+---------------+
1 row in set (0.00 sec)
mysql>
Код: Выделить всё
mysql> DESC razdel_table;
+-------------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+--------------+------+-----+---------+-------+
| rzd_1 | int(3) | NO | MUL | 0 | |
| rzd_2 | int(3) | NO | MUL | 0 | |
| rzd_3 | int(3) | NO | MUL | 0 | |
| rzd_4 | int(3) | NO | MUL | 0 | |
| rzd_5 | int(3) | NO | MUL | 0 | |
| rzd_6 | int(3) | NO | MUL | 0 | |
| id_index_pade_rzd | int(10) | NO | PRI | 0 | |
| url_name | varchar(64) | NO | UNI | NULL | |
| vizible_name_rzd | varchar(128) | NO | | | |
+-------------------+--------------+------+-----+---------+-------+
9 rows in set (0.00 sec)
mysql>