php - SQL Query multiple where clause prioritize -


i have following sql query

select * train_stop code='abc' or code='xyz' or code='def' group number order departs

now since using group by take 1 row specific number. want prioritize result. means if table has code='abc' , code='xyz' , result must select abc row , not 'xyz' because abc has come first in clause. if table has xyz , def same number, xyz must come in result , not def. till experiments led me hows on random basis. helpful if guide me achieve , proper indexing strategy case. thanks.

the create statement follows- 

create statement `create table `train_stop` (   `number` varchar(1000) not null,   `stop_number` int(11) not null,   `code` varchar(1000) not null,   `station name` varchar(1000) not null,   `arrives` time not null,   `departs` time not null,   `halt` varchar(1000) not null,   `pf` varchar(1000) not null,   `day` int(11) not null,   `km` varchar(1000) not null,   `speed` varchar(1000) not null,   `elev` varchar(1000) not null,   `zone` varchar(1000) not null,   `address` varchar(1000) not null,   `active` int(11) default '1',   key `index_1` (`number`(767),`code`(767)),   key `pindex` (`number`(767),`stop_number`),   key `three_columns_idx` (`code`(767),`active`,`departs`),   key `two_columns_idx` (`code`(767),`active`),   key `two_columns_group_idx` (`number`(767),`departs`),   key `one_columns_group_idx` (`departs`) ) engine=innodb default charset=latin1`

group wrong way this. it. need change order by portion match where clause ordering whenever change codes check against.

select * (   select if(@prev = number, @rank := @rank + 1, @rank := 1 , @prev := number) rank,           train_stop.*     train_stop, (select @prev := 0, @rank := 1) q     code = 'abc'      or code = 'xyz'      or code = 'def'    order number asc, code='abc' desc, code='xyz' desc, code='abc' desc ) q rank = 1;

demo here: http://sqlfiddle.com/#!9/ccc4d/7

this query assigns rank per ordered group, , selects top ranked value out of each group. break if have station number 0


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