Dear Friends,
I am having a few problems using a select query which joins two views
containing aggregate functions (see query 1 below). Entering this query in
MS Access through ODBC (linking the tables in) I get the correct result of:
uidtotalansweredcorrecttotaltimeweekno
22152275
22352245
Using Psql I get the result:
uid | totalanswered | correct | totaltime | weekno
-+---+-+---+
221 |10 | 10 |54 | 5
223 |10 | 10 |48 | 5
(2 rows)
I have read similar posts where people have had problems with views
containing aggregate functions so I realise that there remains work to be
done on this aspect, but my question is:
Does anyone know how I can get this query to work? Can I make the query be
interpreted in the same way as ODBC?
Is the problem the same as
http://www.postgresql.org/mhonarc/pgsql-sql/2000-11/msg00175.html which Tim
Lane explained the problem "the rewriter effectively
expands them in-line" (Tim Lane)?
Any help or tips would be greatly appreciated.
David Morgan.
drop table Users;
create table Users
(
UID int4 PRIMARY KEY,
Name text,
Address text,
TelNo text,
EmailAddress text,
FavClub text,
DOB date,
Password text,
Language text
);
drop table QuAnswered;
CREATE TABLE "quanswered" (
"uid" int4 DEFAULT 0 NOT NULL,
"qid" int4 DEFAULT 0 NOT NULL,
"aid" int4 DEFAULT 0,
"tstamp" timestamp DEFAULT "timestamp"('now'::text),
"ttaken" float4,
PRIMARY KEY ("uid", "qid")
);
drop table Questions;
CREATE TABLE "questions" (
"qid" int4 DEFAULT 0 NOT NULL,
"aid" int4 DEFAULT 0,
"queng" text,
"quwel" text,
"weekno" int2 DEFAULT 0,
PRIMARY KEY ("qid")
);
INSERT INTO "users" VALUES (221,'james stagg','23 manai
way\015\012cardiff','029
20315273','[EMAIL PROTECTED]','cardiff','1974-04-15',NULL,'english');
INSERT INTO "users" VALUES (223,'jim','mill
lane','sdkfj','asdgl','rhymmny','199
5-10-01',NULL,'english');
INSERT INTO "questions" VALUES (201,936,'Against which country did Neil
Jenkins
win his first Welsh cap?','201. Yn erbyn pa wlad yr enillodd Neil Jenkins ei
gap
cyntaf dros Gymru?',5);
INSERT INTO "questions" VALUES (202,366,'Who beat Fiji in the Quarter Finals
of
the 1987 World Cup?','202. Yn erbyn pa wlad y collodd Ffiji yn Rownd Wyth
Olaf C
wpan y Byd 1987?',5);
INSERT INTO "questions" VALUES (203,26,'From which club did Pat Lam join
Northam
pton?','203. I ba glwb yr oedd Pat Lam yn chwarae cyn iddo ymuno gyda
Northampto
n?',5);
INSERT INTO "questions" VALUES (204,821,'In which country was Japan`s scrum
half
Graeme Bachop born?','204. Ym mha wlad y ganwyd mewnwr Siapan, Graeme
Bachop',5
);
INSERT INTO "questions" VALUES (205,369,'Who is Scotland`s most capped
outside h
alf?','205. Enwch y chwaraewr sydd wedi ymddangos yn safle`r maswr i`r Alban
y n
ifer fwyaf o weithiau? ',5);
INSERT INTO "quanswered" VALUES (221,201,936,'2001-03-07 10:43:09+00',6);
INSERT INTO "quanswered" VALUES (221,202,366,'2001-03-07 10:43:20+00',8);
INSERT INTO "quanswered" VALUES (221,203,785,'2001-03-07 10:47:15+00',6);
INSERT INTO "quanswered" VALUES (221,204,589,'2001-03-07 10:47:21+00',2);
INSERT INTO "quanswered" VALUES (221,205,257,'2001-03-07 10:47:29+00',5);
INSERT INTO "quanswered" VALUES (223,201,375,'2001-03-07 10:48:14+00',7);
INSERT INTO "quanswered" VALUES (223,202,544,'2001-03-07 10:48:22+00',4);
INSERT INTO "quanswered" VALUES (223,203,26,'2001-03-07 10:48:30+00',6);
INSERT INTO "quanswered" VALUES (223,204,972,'2001-03-07 10:49:42+00',3);
INSERT INTO "quanswered" VALUES (223,205,369,'2001-03-07 10:49:55+00',4);
DROP VIEW all_ans;
CREATE VIEW all_ans as
SELECT qa.uid, sum(qa.ttaken) as TotalTime, count(qa.aid) as TotalAnswered,
qu.
weekno
FROM quanswered qa, questions qu
WHERE qa.qid=qu.qid
GROUP BY qa.uid, qu.weekno;
DROP VIEW cor_ans;
CREATE VIEW cor_ans AS
SELECT qa.uid, count(qa.uid) AS correct, qu.weekno
FROM questions qu, quanswered qa
WHERE ((qu.aid = qa.aid)
AND (qu.qid = qa.qid))
GROUP BY qa.uid, qu.WeekNo;
Query 1
---
SELECT all_ans.uid, all_ans.totalanswered, cor_ans.correct,
all_ans.totaltime, all_ans.weekno
FROM all_ans, cor_ans
WHERE all_ans.weekno= cor_ans.weekno
AND all_ans.uid=cor_ans.uid;
---(end of broadcast)---
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