数据汇总查询

现在我要对一个表进行数据汇总查询，如：
select ZLLBDM,count(ZLLB) num from AJJML_ZB group by ZLLBDM，
得出结果为：
"ZLLBDM" "NUM"
"10" "6"
"11" "138"
"12" "190"
"13" "70"
"14" "143"
"15" "9"
"16" "25"
"19" "14"
"20" "5"
"21" "2"
"22" "2"
"23" "5"
"29" "8"
"30" "3545"
"40" "46"
"41" "355"
"42" "266"
"43" "122"
"44" "4"
"50" "61"
"51" "552"
"52" "77"
"53" "8"
"54" "65"
"60" "348"
"70" "42"
"90" "151"怎么样根据首字母进行分类汇总统计？