UNION Questoion where the individual queries work fine...

Question

Trying to do this query:
SELECT
to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'MM/DD/YY HH24:MI:SS') DATIME,
"NUMBER" as DANUMBER,
PRIMARY_ASSIGNMENT_GROUP as ORIGINATOR_GROUP,
ASSIGNMENT as ASSIGNMENT_GROUP,
TECHNICAL_SERVICE,
LOGICAL_NAME
from
SMINCREQ
LEFT JOIN SMOPERATOR on SMINCREQ.OPENED_BY=SMOPERATOR.NAME
where
((to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'HH24')
between '00' and '08') or (to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'HH24') between '19' and '24'))
and open_time>'01-JUL-2011'
ORDER by open_time
UNION ALL
SELECT
to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'MM/DD/YY HH24:MI:SS') DATIME,
incident_id as DANUMBER,
PRIMARY_ASSIGNMENT_GROUP as ORIGINATOR_GROUP,
PRIMARY_ASSIGNMENT_GROUP as ASSIGNMENT_GROUP,
TECHNICAL_SERVICE,
LOGICAL_NAME
from SMINTERACTIONS
When the individual sections are run it works fine but fails on the UNION. I'm not sure why this would differ with this simple UNION

Answer 1

Maybe:
SELECT to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'MM/DD/YY HH24:MI:SS') DATIME,
       "NUMBER" as DANUMBER,  /* you said it worked as a single query */
       PRIMARY_ASSIGNMENT_GROUP as ORIGINATOR_GROUP,
       ASSIGNMENT as ASSIGNMENT_GROUP,
       TECHNICAL_SERVICE,
       LOGICAL_NAME
  from SMINCREQ
       LEFT JOIN
       SMOPERATOR
    on SMINCREQ.OPENED_BY = SMOPERATOR.NAME
where ((to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'HH24') between '00' and '08'
    or  (to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'HH24') between '19' and '24'
   and open_time > '01-JUL-2011'
ORDER by open_time
UNION ALL
SELECT to_char(CAST((FROM_TZ(CAST(open_time AS TIMESTAMP),'+00:00') AT TIME ZONE 'US/Eastern') AS DATE),'MM/DD/YY HH24:MI:SS') DATIME,
       to_char(incident_id) as DANUMBER, /* <=== if incident_id is a number */
       PRIMARY_ASSIGNMENT_GROUP as ORIGINATOR_GROUP,
       PRIMARY_ASSIGNMENT_GROUP as ASSIGNMENT_GROUP,
       TECHNICAL_SERVICE,
       LOGICAL_NAME
  from SMINTERACTIONS Regards
Etbin