Group by sql statement is not sorted.

Question

execut sql statement include group by clause in a oci program, the result is not sorted.
I don't know why..
in SqlPlus, same sql statement return sorted data.
SELECT A.SHOP_ID,A.RESALE_TYPE,
SUM(A.DEAL_AMT,0) DEAL_AMT
FROM SHOP_ACC A, CD_TAB C
WHERE A.RESALE_TYPE = C.CD(+)
AND C.GB = 'AB'
AND A.ACC_M = :s_AccMonth
AND DEAL_GB='FOD'
GROUP BY A.SHOP_ID,A.RESALE_TYPE
But, RESALE_TYPE is outer join on CD_TAB..
if remove outer join between CD_TAB and SHOP_ACC,
sql statement is return sorted result.
and if modify the column RESALE_TYPE like
RESALE_TYPE||']' or NVL(RESALE_TYPE,'AAA')
return sorted result..
please help..
thanks for your kind.

Answer 1

thank you.. for reply..
I knew that order by clause make to sort.
but, using group by clause alone in SQL statement, that return sorted results too.
I was found a fault that outer join table CD_TAB column of one is not symbloc "(+)" in SQL statement
SELECT A.SHOP_ID,A.RESALE_TYPE,
SUM(A.DEAL_AMT,0) DEAL_AMT
FROM SHOP_ACC A, CD_TAB C
WHERE A.RESALE_TYPE = C.CD(+)
AND C.GB = 'AB' <----------- AND C.GB(+) = 'AB'
AND A.ACC_M = :s_AccMonth
AND DEAL_GB='FOD'
GROUP BY A.SHOP_ID,A.RESALE_TYPE
I want to know that why in other application - such as SqlPlus or SqlGate and ..etc. - this fault was ignore.. but OCI application such as my application programs is not ignore.. and is not sorted..
thank you..