php mysql sort result by value of field using position of substring -

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i have field name "codehead" values 

"53/066/10"  "54/066/05"  "56/066/09"  "52/069/15"  "53/069/02" "67/069/02" "00/020/80" "00/020/98"

i want results in following order

"00/020/80" "00/020/98" "53/066/05" "53/066/10" "54/066/09" "52/069/15"  "53/069/02" "67/069/02"

i have tried query 

$data= mysql_query("select codehead,sign, sum(amt) amt pm month='$pmmonth' , rc='r' group substr(codehead,4,3) asc,substr(codehead,7,2) asc,  sign ")

but not complete result.

this expression: 

substr(codehead,7,2)

is returning forward slash , digit. looks wanted start @ position 8.

but won't satisfy order shown, fifth row has 09, , come before 10 on preceding row. desired result shown makes result ordered on left(codehead,2)

 group codehead, `sign`  order substr(codehead,4,3)  asc         , left(codehead,2)      asc         , substr(codehead,8,2)  asc

note: in future release of mysql, non-standard mysql extension of group by imply order by may removed.

i'm suspicious of group by on substrings. that's valid sql that, question how want handle codehead values match on substrings, different in other place... given you're returning codehead in select list.

the normative pattern group by expressions in select list.


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