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Re: LEFT OUTER JOIN on IDS 9.2

Posted By: Jonathan Leffler
Date: Wednesday, 11 February 2004, at 6:01 p.m.

In Response To: LEFT OUTER JOIN on IDS 9.2 (KEVIN)

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You said:
I have two queries that I expect the same results from.

I ask:
Why do you expect the same result? Informix's outer join is a totally
different critter from an ISO outer join. They are superficially simil=
ar,
and there are circumstances where they produce the same result, but the=
y
are very far from being identical. And, in particular, when you place =
a
search criterion on the outer table, Informix and ISO have different vi=
ews
on what the correct answer is. Your code includes the term c.customer=
_id
=3D '123' and c is an alias for the outer join table. Informix will pr=
eserve
all the rows in the inner table that meet the criteria regardless of
whether there are rows in the outer table that match - it sort of does =
the
outer join twice. ISO does the outer join once, and then filters the
result. Your results are consistent with that. The explanation of wha=
t
Informix does is incredibly difficult.

--
Jonathan Leffler (jleffler@us.ibm.com)
STSM, Informix Database Engineering, IBM Data Management
4100 Bohannon Drive, Menlo Park, CA 94025
Tel: +1 650-926-6921 Tie-Line: 630-6921
"I don't suffer from insanity; I enjoy every minute of it!"

|---------+---------------------------->
| | "KEVIN" |
| | <kslindholm@excit|
| | e.com> |
| | Sent by: |
| | forum.subscriber@|
| | iiug.org |
| | |
| | |
| | 02/11/2004 11:48 |
| | AM |
|---------+---------------------------->
>--------------------------------------------------------------------=
-----------------------------------------------------------------------=
--|
| =
=
|
| To: ids@iiug.org =
=
|
| cc: =
=
|
| Subject: LEFT OUTER JOIN on IDS 9.2 [2530] =
=
|
>--------------------------------------------------------------------=
-----------------------------------------------------------------------=
--|

I have two queries that I expect the same results from. They are as
follow:
--Query One
SELECT s.year_month
,s.period_status
,c.customer_id
FROM summary s,OUTER customer_activity c
WHERE s.year_month =3D c.year_month
AND s.year_month IN('200401','200402','200403')
AND c.customer_id =3D '123'
ORDER BY s.year_month DESC;

--Query Two
SELECT s.year_month
,s.period_status
,c.customer_id
FROM summary s
LEFT OUTER JOIN customer_activity c ON s.year_month =3D c.year_month
WHERE s.year_month IN ('200401','200402','200403')
AND c.customer_id =3D '123'
ORDER BY s.year_month DESC;

Results are:
--Query One Results
year_month| period_status| customer_id
200403 | N |
200402 | N | 123
200401 | R | 123

--Query Two Results
year_month| period_status| customer_id
200402 | N | 123
200401 | R | 123

Am I wrong in thinking that these queries should give me the same resul=
ts?
What is the difference?

Thanks,
Kevin

=

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<html><body>
You said: 
<tt>I have two queries that I expect the same results from.  </tt>=
 
 
I ask: 
Why do you expect the same result? Informix's outer join is a totally =
different critter from an ISO outer join. They are superficially simil=
ar, and there are circumstances where they produce the same result, but=
they are very far from being identical. And, in particular, when you =
place a search criterion on the outer table, Informix and ISO have diff=
erent views on what the correct answer is. Your code includes the ter=
m c.customer_id =3D '123' and c is an alias for the outer join table. =
Informix will preserve all the rows in the inner table that meet the cr=
iteria regardless of whether there are rows in the outer table that mat=
ch - it sort of does the outer join twice. ISO does the outer join on=
ce, and then filters the result. Your results are consistent with that=
. The explanation of what Informix does is incredibly difficult. 
 
-- 
Jonathan Leffler (jleffler@us.ibm.com) 
STSM, Informix Database Engineering, IBM Data Management 
4100 Bohannon Drive, Menlo Park, CA 94025 
Tel: +1 650-926-6921 Tie-Line: 630-6921 
"I don't suffer from insanity; I enjoy every minute of it!&q=
uot; 
 
 
<img src=3D"cid:10__=3D08BBE4A4DFEE4EDB8f9e8a93df938@us.ibm.com" width=3D=
"16" height=3D"16" alt=3D"Inactive hide details for "KEVIN" &=
lt;kslindholm@excite.com>">"KEVIN" <kslindholm@excite.c=
om> 
 
 

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lpadding=3D"0">
<tr valign=3D"top"><td width=3D"1%"><img src=3D"cid:20__=3D08BBE4A4DFEE=
4EDB8f9e8a93df938@us.ibm.com" border=3D"0" height=3D"1" width=3D"72" al=
t=3D""> 
</td><td style=3D"background-image:url(cid:30__=3D08BBE4A4DFEE4EDB8f9e8=
a93df938@us.ibm.com); background-repeat: no-repeat; " width=3D"1%"><img=
src=3D"cid:20__=3D08BBE4A4DFEE4EDB8f9e8a93df938@us.ibm.com" border=3D"=
0" height=3D"1" width=3D"225" alt=3D""> 

<ul>
<ul>
<ul>
<ul>"KEVIN" <kslindholm@excite.com>=
 
Sent by: forum.subscriber@iiug.org
02/11/2004 11:48 AM</ul>
</ul>
</ul>
</ul>
</td><td width=3D"100%"><img src=3D"cid:20__=3D08BBE4A4DFEE4EDB8f9e8a93=
df938@us.ibm.com" border=3D"0" height=3D"1" width=3D"1" alt=3D""> 
 
 To: ids@iiug.org 
 cc: 
 Subject: LEFT OUTER JOIN on I=
DS 9.2 [2530]</td></tr>
</table>
 
 
<tt>I have two queries that I expect the same results from.  They =
are as follow: 
--Query One 
SELECT s.year_month 
,s.period_status 
,c.customer_id 
FROM summary s,OUTER customer_activity c 
WHERE s.year_month =3D c.year_month 
AND s.year_month IN('200401','200402','200403') 
AND c.customer_id =3D '123' 
ORDER BY s.year_month DESC; 
 
--Query Two 
SELECT s.year_month 
,s.period_status 
,c.customer_id 
FROM summary s 
LEFT OUTER JOIN customer_activity c ON s.year_month =3D c.year_month<b=
r>
WHERE s.year_month IN ('200401','200402','200403') 
AND c.customer_id =3D '123' 
ORDER BY s.year_month DESC; 
 
Results are: 
--Query One Results 
year_month| period_status| customer_id 
200403    | N           | 
200402    | N           | 123 
200401    | R           | 123 
 
--Query Two Results 
year_month| period_status| customer_id 
200402    | N           | 123 
200401    | R           | 123 
 
Am I wrong in thinking that these queries should give me the same resul=
ts?  What is the difference? 
 
Thanks, 
Kevin 
 
</tt>

</body></html>=

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Messages In This Thread

LEFT OUTER JOIN on IDS 9.2
KEVIN -- Wednesday, 11 February 2004, at 2:48 p.m.
- Re: LEFT OUTER JOIN on IDS 9.2
  Dorn Bhechsonggram -- Wednesday, 11 February 2004, at 5:14 p.m.
- Re: LEFT OUTER JOIN on IDS 9.2
  Jonathan Leffler -- Wednesday, 11 February 2004, at 6:01 p.m.
- RE: LEFT OUTER JOIN on IDS 9.2
  June C. Hunt -- Thursday, 12 February 2004, at 4:46 a.m.

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