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using order by with union all - oracly query

Posted on 2016-10-06
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Last Modified: 2016-10-25
Using the query below, I'm trying to set the order of the grade_level column.  If I put order by grade_level in the query I want to set the order in, it says the query isn't ended properly.  If I put it at the very bottom, is says the field is invalid.  I'm stuck on this one, any help is appreciated.  thanks!


UNION ALL
SELECT 'Totals (schools above only)' as School,null,null,null,null,null,null,null,null,null,null,null,null,null,null FROM dual
UNION ALL
SELECT 
null,grade_level,null,null,null,null,null,null,null,null,
COUNT(CASE WHEN S_CT_STU_DEMOGRAPHICS_X.GIFTEDTALENTED = '09' THEN 1 end) ALP,
COUNT(CASE WHEN S_CT_STU_SPED_X.SPECIALEDUCATION = 'Y' THEN 1 end) SPED,
COUNT(CASE WHEN ETHNICITY <> '04' THEN 1 end) Minority,
COUNT(CASE WHEN S_CT_STU_LANGUAGE_X.ELLINDICATOR = 'Y' THEN 1 end) ESOL,
COUNT(student_number) cnt
FROM students
LEFT JOIN PS.S_CT_STU_SPED_X S_CT_STU_SPED_X ON STUDENTS.DCID = S_CT_STU_SPED_X.STUDENTSDCID
LEFT JOIN PS.S_CT_STU_LANGUAGE_X S_CT_STU_LANGUAGE_X ON STUDENTS.DCID = S_CT_STU_LANGUAGE_X.STUDENTSDCID
LEFT JOIN PS.S_CT_STU_DEMOGRAPHICS_X S_CT_STU_DEMOGRAPHICS_X ON STUDENTS.DCID = S_CT_STU_DEMOGRAPHICS_X.STUDENTSDCID
WHERE enroll_status = 0 AND schoolid IN (3, 4, 8, 9, 10, 13, 14, 15, 22) AND lower(last_name) != 'doe'
GROUP BY grade_level
UNION ALL
SELECT 
'totals' as totals,null,null,null,null,null,null,null,null,null,
COUNT(CASE WHEN S_CT_STU_DEMOGRAPHICS_X.GIFTEDTALENTED = '09' THEN 1 end) ALP,
COUNT(CASE WHEN S_CT_STU_SPED_X.SPECIALEDUCATION = 'Y' THEN 1 end) SPED,
COUNT(CASE WHEN ETHNICITY <> '04' THEN 1 end) Minority,
COUNT(CASE WHEN S_CT_STU_LANGUAGE_X.ELLINDICATOR = 'Y' THEN 1 end) ESOL,
COUNT(student_number) cnt
FROM students
LEFT JOIN PS.S_CT_STU_SPED_X S_CT_STU_SPED_X ON STUDENTS.DCID = S_CT_STU_SPED_X.STUDENTSDCID
LEFT JOIN PS.S_CT_STU_LANGUAGE_X S_CT_STU_LANGUAGE_X ON STUDENTS.DCID = S_CT_STU_LANGUAGE_X.STUDENTSDCID
LEFT JOIN PS.S_CT_STU_DEMOGRAPHICS_X S_CT_STU_DEMOGRAPHICS_X ON STUDENTS.DCID = S_CT_STU_DEMOGRAPHICS_X.STUDENTSDCID
WHERE enroll_status = 0 AND schoolid IN (3, 4, 8, 9, 10, 13, 14, 15, 22) AND lower(last_name) != 'doe'
UNION ALL
SELECT 
'total percentages' as percentage,null,null,null,null,null,null,null,null,null,
ROUND(COUNT(CASE WHEN S_CT_STU_DEMOGRAPHICS_X.GIFTEDTALENTED = '09' THEN 1 end)/ count(*) * 100) ALP,
ROUND(COUNT(CASE WHEN S_CT_STU_SPED_X.SPECIALEDUCATION = 'Y' THEN 1 end)/ count(*) * 100) SPED,
ROUND(COUNT(CASE WHEN ETHNICITY <> '04' THEN 1 end)/ count(*) * 100) Minority,
ROUND(COUNT(CASE WHEN S_CT_STU_LANGUAGE_X.ELLINDICATOR = 'Y' THEN 1 end)/ count(*) * 100) ESOL,
null
FROM students
LEFT JOIN PS.S_CT_STU_SPED_X S_CT_STU_SPED_X ON STUDENTS.DCID = S_CT_STU_SPED_X.STUDENTSDCID
LEFT JOIN PS.S_CT_STU_LANGUAGE_X S_CT_STU_LANGUAGE_X ON STUDENTS.DCID = S_CT_STU_LANGUAGE_X.STUDENTSDCID
LEFT JOIN PS.S_CT_STU_DEMOGRAPHICS_X S_CT_STU_DEMOGRAPHICS_X ON STUDENTS.DCID = S_CT_STU_DEMOGRAPHICS_X.STUDENTSDCID
WHERE enroll_status = 0 AND schoolid IN (3, 4, 8, 9, 10, 13, 14, 15, 22) AND lower(last_name) != 'doe'

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Question by:Basssque
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slightwv (䄆 Netminder) earned 500 total points (awarded by participants)
ID: 41832266
You can only have one order by on a unioned query.

Try simplified tests to see this.

This will reproduce the same error you described:
select 'hello' col from dual order by 1
union all
select 'world' from dual
/

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Think about it this way:  The union says to treat all select statements as one query.  The order by is for the entire result set.

Add only one order by ad the end of all the unions:
select 'hello' col from dual
union all
select 'world' from dual
order by 1
/

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That orders the results of both queries not just the second one.
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