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How to do an Order by Case with Union All

Posted on 2010-11-22
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Last Modified: 2012-05-10
Hello,

I am trying to do an Order by Case on a Select with a UNION ALL. I am getting the error: sql order by items must appear in the select list if the statement contains a union.

I have tried using the order by in both select statements, and have also tried parenthaszing both select statements and placing the order by at the end outside of the parenthesis, but to no avail.

Could someone please take a look at the attachment and let me know what I'm doing wrong? Thanks!
Order-by-case-with-union-all.doc
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Question by:erp1022
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3 Comments
 
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 34189079
this will do:
SELECT *
 FROM (SELECT a.account as Natural
,rtrim(a.ACTDESCR) as Descr
,(g.CRDTAMNT - g.DEBITAMT) AS Amount
,CASE
WHEN a.account like '400%' then 'G'
WHEN a.account like '42%' or a.accountlike '43%' then 'H'
WHEN a.account = '47100' then '3'
WHEN a.ACCOUNT IN ('45100', '45050') then 'P' 
END as Service

FROM GL00100 a 
INNER JOIN GL20000 g 
ON a.ACTINDX = g.ACTINDX 
INNER JOIN RM00101 c 
ON g.ORMSTRID = c.CUSTNMBR

WHERE a.ACCOUNT LIKE '4%' AND
etc.


UNION ALL

SELECT a.account as Natural
,rtrim(a.ACTDESCR) as Descr
,(g.CRDTAMNT - g.DEBITAMT) AS Amount
,CASE
WHEN a.account like '400%' then 'G'
WHEN a.account like '42%' or a.account like '43%' then 'H'
WHEN a.account = '47100' then '3'
WHEN a.ACCOUNT IN ('45100', '45050') then ‘P’ 
END as Service

FROM GL00100 a 
INNER JOIN GL30000 g 
ON a.ACTINDX = g.ACTINDX 
INNER JOIN RM00101 c 
ON g.ORMSTRID = c.CUSTNMBR

WHERE  a.ACCOUNTLIKE '4%' AND 
) sq

Order by CASE
	WHEN Natural like '400%' then 1
	WHEN Natural like '42%' or Natural like '43%' then 2
	WHEN Natural = '47100' then 3
	WHEN Natural IN ('45100', '45050') then 4
END

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Author Comment

by:erp1022
ID: 34190390
Great, that works! Could you explain what you did and why? I have a couple of other queries I need to modify and would like to understand what I was doing wrong.
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LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 34194610
no problem.

you had (abstract):
select a.field ... from table a UNION select ... ORDER BY a.field 

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the issue is that, because you have a union, the ORDER BY cannot know the 2 SELECT field names, because the second query could have completely other tables, aliases, fields ...

so, you have to ORDER BY the resulting field names, so for a.Account as Natural, Natural being the resulting field name, you have to order by that "name" .

CHeers
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