output of two different queries as one result in oracle SQL

I have two different table on which i apply select query with some filters and aggregate functions like SUM,COUNT,SUBSTR.

I want to get these two different output in a single result.example:

Query 1:

SELECT
    a.message_type,
    a.queue_seqnum,
    b.queue_seqnum,
    SUBSTR(b.char_data,1,2) files
FROM
    ad_in_messageheader a,
    ad_in_messagedetail b 
WHERE
    a.queue_seqnum = b.queue_seqnum AND
    a.MESSAGE_TYPE IN ('ERP_COSTS_SMRY','ERP_SALES_SMRY','ERP_SPEND_SMRY') AND
    a.create_time > '17-DEC-13 07.00.00 AM'
ORDER BY
    a.queue_seqnum desc;

Query 2:

SELECT
    a.message_type,
    count(a.message_type) count
FROM
    ad_in_messageheader a 
WHERE
    a.MESSAGE_TYPE in ('ERP_COSTS','ERP_SALES','ERP_SPEND') AND
    create_time > '17-DEC-13 07.00.00 AM'
GROUP BY
    a.message_type;

I have tried UNION and UNION ALL both. But those are not working. I also tried to Select * from (query 1),(query 2), But it also did not work. Kindly suggest me some solution which will be helpful in this scenario. Thanks.