Re: What's wrong with this query?
On 10 Jul 2003 at 13:20, Chris Boget wrote:
SELECT certificate.cert_num, master_info.uid
FROM certificate
JOIN master_info ON ( certificate.uid = master_info.uid )
LEFT JOIN endorsements ON ( certificate.cert_num =
endorsements.cert_num ) WHERE certificate.active = 1 AND
certificate.referred = 0 AND certificate.status IN ('O', 'C') AND
endorsements.endorse_mode='cancel' ORDER BY master_info.company,
certificate.bound, certificate.cert_num;
ERROR 1064: You have an error in your SQL syntax near 'ON (
certificate.uid = master_info.uid ) LEFT JOIN endorsements ON (
certificate' at line 1
Plain JOIN doesn't take a join condition (ON). You presumably mean
INNER JOIN. See the documentation:
http://www.mysql.com/doc/en/JOIN.html
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RE: What's wrong with this query?
what would be causing the error:
SELECT certificate.cert_num, master_info.uid
FROM certificate
JOIN master_info ON ( certificate.uid = master_info.uid )
LEFT JOIN endorsements ON ( certificate.cert_num =
endorsements.cert_num )
WHERE certificate.active = 1
AND certificate.referred = 0
AND certificate.status IN ('O', 'C')
AND endorsements.endorse_mode='cancel'
ORDER BY master_info.company, certificate.bound, certificate.cert_num;
ERROR 1064: You have an error in your SQL syntax near 'ON (
certificate.uid =
master_info.uid ) LEFT JOIN endorsements ON ( certificate' at line 1
I don't think the [CROSS] JOIN gets a join condition. Check the manual on
JOIN syntax
http://www.mysql.com/doc/en/JOIN.html
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Re: What's wrong with this query?
Why isn't the key being used in the c (certificate) table?
SELECT DISTINCT a.uid, a.company, a.firstname, a.lastname
FROM master_info a, logins lsl, logins lc, certificate c WHERE
a.uid = lsl.uid AND lc.parent = lsl.uid AND lc.uid = c.uid AND
c.void 1 AND c.status IN
('CP', 'MC', 'AIC', 'RP', 'VQ', 'NQ', 'LQ', 'RQ', 'NG', 'EP', 'AA',
'AD' ) AND lsl.active = 1 AND lsl.void = 0 ORDER BY company, uid
How do you think the key should be used? You have a key on status,
but you're asking for a wide range of status values. Presumably
MySQL thinks (probably correctly) that using the index to find a
range of status values from 'AA' to 'VQ' is no faster than doing a
full table scan.
I could be missing something, but if so it would help if you could
explain how you expect the key to be used.
Well, I would expect it to use the key on the status column. But
barring that (as you suggest, MySQL might think that using the
key on status would be no faster), I would at least expect it to be
using the key for the 'uid' field and possible the (uid,void,status)
key as well. Even just using the key on the uid field could very
well speed the query up as it would be pulling the records matching
the 'status' column from a diminished field of possible records.
Or do I have it all wrong?
Chris
mysql,query,blah
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Re: What's wrong with this query?
On 19 Jun 2003 at 16:18, Chris Boget wrote:
Why isn't the key being used in the c (certificate) table?
SELECT DISTINCT a.uid, a.company, a.firstname, a.lastname
FROM master_info a, logins lsl, logins lc, certificate c WHERE
a.uid = lsl.uid AND lc.parent = lsl.uid AND lc.uid = c.uid AND
c.void 1 AND c.status IN
('CP', 'MC', 'AIC', 'RP', 'VQ', 'NQ', 'LQ', 'RQ', 'NG', 'EP', 'AA',
'AD' ) AND lsl.active = 1 AND lsl.void = 0 ORDER BY company, uid
How do you think the key should be used? You have a key on status,
but you're asking for a wide range of status values. Presumably
MySQL thinks (probably correctly) that using the index to find a
range of status values from 'AA' to 'VQ' is no faster than doing a
full table scan.
I could be missing something, but if so it would help if you could
explain how you expect the key to be used.
--
Keith C. Ivey [EMAIL PROTECTED]
Tobacco Documents Online
http://tobaccodocuments.org
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