The original sql query returned nothing. 0 rows.
The second (with a left join) returned a record for every date avaiable,
but a 0 in all others fields. (0 shipments, 0 undelivered, 0 returned, 0
open, etc)
Im not sure if we can solve this with a join, since each colum does have
a different set of conditions (like where clausules)
James
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 12 August 2005 16:41
To: [EMAIL PROTECTED]
Cc: James M. Gonzalez; mysql@lists.mysql.com
Subject: Re: Complex query. (It's killing me)
Sorry - I think you need a LEFT JOIN or it won't count shipments which
are
not returned.
Alec
[EMAIL PROTECTED]
12/08/2005 16:38
To
[EMAIL PROTECTED]
cc
mysql@lists.mysql.com
Subject
Re: Complex query. (It's killing me)
Just in the spirit of refining my own skills, here is how I would tackle
the problem. It parses, but I haven't populated the tables so I don't
know
if it works:
SELECT s.dateshipped, COUNT(r.type="undelivered"), COUNT(r.type =
"customer"), COUNT(r.status="open")
FROM shipments s JOIN returns r ON s.id = r.id
GROUP BY s.dateshipped
ORDER BY s.dateshipped DESC ;
Does this do anything worthwhile?
"James M. Gonzalez" <[EMAIL PROTECTED]>
12/08/2005 16:16
To
<mysql@lists.mysql.com>
cc
Subject
Complex query. (It's killing me)
Hello list, I got a sql query that's is just beating me (5-0). Have have
read here and there, and MySQL Query Browser is just fed up with all the
tries I have made it do. It is just not working.
First, the tables (simplified version, if need more info just tell me):
[shipments]
ID int
DateShipped DATE
[returns]
ID INT
DateReturned DATE
Type ENUM('undelivered','customer')
Status ENUM('open','close')
Second, the expected result:
Shipped Undelivered Returned Open
12/8/2005 14 3 3 3
11/8/2005 13 1 1 1
10/8/2005 22 3 8 7
09/8/2005 16 9 5 6
08/8/2005 28 3 6 7
Explanation of field columns:
Shipped: rows from [shipments] that have the field 'DateShipped'
populated.
Undelivered: rows from [returns] that have Type = 'undelivered'
Returnded: rows from [returns] that have Type = 'customer'
Open: rows from [returns] that have Status = 'open'
Third, the sql query I have came out with so far is (my non-working best
solution)
SELECT
shipments.DateShipped,
SUM(CASE
WHEN shipments.DateShipped IS NOT NULL THEN 1
ELSE 0
END) AS shipped
SUM(CASE
WHEN returns.DateReturned='undelivered' THEN 1
ELSE 0
END) AS undelivered,
SUM(CASE
WHEN returns.DateReturned='customer' THEN 1
ELSE 0
END) AS returned,
SUM(CASE
WHEN returns.Status='open' THEN 1
ELSE 0
END) AS open
FROM shipments, returns
GROUP BY shipments.DateShipped
ORDER BY shipments.DateShipped DESC
LIMIT 5
That's it. Im SO stuck with this query. I would really really appreciate
any help, hints, links, or ideas about it.
James G.
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