Mysql, complex ORDER BY - mysql

Question

Two columns town and priority.
I need to sort table, so that towns with priority=1 would be first and not sorted by name ASC, while the rest gets sorted by name ASC.
How would i do that?
Thanks ;)
Update
SELECT *
FROM map_towns
ORDER BY priority DESC, town
Like this, but so that priority were from 1 to 12+ instead of 12 to 1.
Like that:
town priority
b_town1 1
a_town2 2
d_town3 3
c_town4 4
a_town5 NULL
b_town6 NULL
c_town7 NULL
d_town8 NULL
etc...

Answer 1

By default, MySQL sorts nulls first
I created a small test case (rows inserted non-sorted on purpose).
create table map_towns(
town varchar(30) not null
,priority int null
);
insert into map_towns(town, priority) values('d_town3', 3);
insert into map_towns(town, priority) values('a_town2', 2);
insert into map_towns(town, priority) values('c_town4', 4);
insert into map_towns(town, priority) values('b_town1', 1);
insert into map_towns(town, priority) values('b_town6', NULL);
insert into map_towns(town, priority) values('d_town8', NULL);
insert into map_towns(town, priority) values('a_town5', NULL);
insert into map_towns(town, priority) values('c_town7', NULL);
The following query should do what you ask for.
select town
,priority
,isnull(priority)
from map_towns
order by isnull(priority), priority, town;
+---------+----------+------------------+
| town | priority | isnull(priority) |
+---------+----------+------------------+
| b_town1 | 1 | 0 |
| a_town2 | 2 | 0 |
| d_town3 | 3 | 0 |
| c_town4 | 4 | 0 |
| a_town5 | NULL | 1 |
| b_town6 | NULL | 1 |
| c_town7 | NULL | 1 |
| d_town8 | NULL | 1 |
+---------+----------+------------------+
Here is a link on ISNULL documentation

Answer 2

My idea:
SELECT * FROM Towns
ORDER BY IF(priority = 1, 0, 1) ASC,
town ASC;

Answer 3

Well just simply make it so that the Priority by default is 0, and then each Town you have you can sort them based on a number. I would normally do something like DisplayOrder which in terms could be your Priority.
something like this.
SELECT * FROM Towns
ORDER BY priority ASC,
name ASC;
So if you have something like
id, name, priority
-----------------------
1, Smithtown, 0
2, Rocktown, 2
3, Georgetown, 1
4, Rockton, 2
The ordering then would be
1, Smithtown, 0
3, Georgetown, 1
4, Rockton, 2
2, Rocktown, 2

Answer 4

SELECT *
FROM map_towns
ORDER BY
priority IS NULL, priority, town