I occasionally run into issues where I would like to ensure that the
values across two or three columns are not duplicated. At work we use
Oracle, and I see that they add constraints when creating the columns. I
am running mysql 5.0 and was hoping someone could give me the simple
explanation of
How about this?
CREATE TABLE `test`.`test` (
`x` INTEGER UNSIGNED NOT NULL DEFAULT 0,
`y` INTEGER UNSIGNED NOT NULL DEFAULT 0,
`Z` INTEGER UNSIGNED NOT NULL DEFAULT 0,
UNIQUE `Index_1`(`x`, `y`, `Z`)
)
ENGINE = InnoDB;
Tim
-Original Message-
From: Scott Purcell [mailto:[EMAIL
--- Scott Purcell [EMAIL PROTECTED] wrote:
I occasionally run into issues where I would like to ensure that the
values across two or three columns are not duplicated. At work we use
Oracle, and I see that they add constraints when creating the
columns. I
am running mysql 5.0 and was hoping
sorry :( I clicked send too early
--- Shawn Green [EMAIL PROTECTED] wrote:
--- Scott Purcell [EMAIL PROTECTED] wrote:
I occasionally run into issues where I would like to ensure that
the
values across two or three columns are not duplicated. At work we
use
Oracle, and I see that
Several of my DISTINCT searches are frequently showing up in the slow query
log. These queries use multiple table joins. Using EXPLAIN shows that the
queries are using the appropriate keys, as far as I know. Are DISTINCT
searches using multiple joins slow?
TIA.
Stephen P. Fracek, Jr.
[EMAIL
On Apr 28, 2006, at 7:12 PM, David Lindelöf wrote:
Is there an easy way to get the last timestamped record not later
than a
given date/time?
Well, yeah, that part is easy.
select * from your_table where timestamp target_time order by
timestamp desc limit 1
Your problem seems to
Well, normally a DISTINCT has to do a type of sort and is slower than
non-DISTINCT queries. Each field of the result set is considered in the
DISTINCT logic. Can you modify the query so that it does not require the
DISTINCT? Can you post the query?
R.
-Original Message-
From: Stephen P.
On 2006-05-01 11:55 AM, Robert DiFalco [EMAIL PROTECTED] wrote:
Well, normally a DISTINCT has to do a type of sort and is slower than
non-DISTINCT queries. Each field of the result set is considered in the
DISTINCT logic. Can you modify the query so that it does not require the
DISTINCT? Can
I have the following table:
*Column Information For - production.group15034_I*/
FieldType Collation NullKey
Default Extra Privileges Comment
---
Would you need the DISTINCT if you change the query like so?
SELECT Site.Site_ID, Site, Status, Type
FROM Site
JOIN Project ON Site.Site_ID = Project.Site_ID
ORDER BY Site;
You may also want to just try your initial query without the distinct to
see if that is
I have a table like so:
ID int
val1int
val2int
I can have multiple records where id is the same. e.g:
ID val1val2
1 1 2
1 1 1
2 2 2
2 1 1
2 2 2
I need to find which id has the most records.
Thanks
Robert Gehrig
Hi,
I want to run following command thru script .
analyze table t1;
optimize table t1;
analyze table t2;
optimize table t2;
Can I do it on linux mysql ?
I also want to run script like during analysing if we notice any error
related with table then run repair table t1 l
SELECT id, count(*) AS cnt
FROM `table_name`
GROUP BY id
ORDER BY cnt DESC
[ LIMIT 1 ]
--
Gabriel PREDA
Senior Web Developer
perl ?
just quickly throwing something together - this is untested.
$done = 0;
$count = 0;
while ($done) {
$dbh-do(analyze table t1);
my $info = $dbh-{mysql_info};
if ($info =~ /some kind of error message/) {
$dbh-do(repair table t1);
my $info2 =
On 2006-05-01 1:14 PM, Robert DiFalco [EMAIL PROTECTED] wrote:
Would you need the DISTINCT if you change the query like so?
SELECT Site.Site_ID, Site, Status, Type
FROM Site
JOIN Project ON Site.Site_ID = Project.Site_ID
ORDER BY Site;
You may also want to just try your initial query
The THEORY behind both statements is fine
1. Have a primary, single column integer index, auto incrementing (probably)
for every record
2. Have a primary index that uniquely identifies your data.
The advantage of 2 is that it is (usually) obvious what the unique
characteristics of your data
I ran mysqlcheck against a replication master database and it reported a
problem with a table, which it corrected. Is the slave now out of sync?
If so, how do I correct the problem without copying the whole database
over a slow WAN link?
--Eric
--
MySQL General Mailing List
For list archives:
On 5/1/06, Robinson, Eric [EMAIL PROTECTED] wrote:
I ran mysqlcheck against a replication master database and it reported a
problem with a table, which it corrected. Is the slave now out of sync?
If so, how do I correct the problem without copying the whole database
over a slow WAN link?
--Eric
Dirk,
I would like to know where there ar duplicate accounts that do not have
duplicate addresses. I think that at this point in time that these are
included in the first query. I would like to separate these out to
report on them.
How about ...
select account,ident,address
from group15034_i
How about something like this?
SELECT Site.Site_ID, Site, Status, Type
FROM Site
WHERE EXISTS( SELECT * FROM Project)
ORDER BY Site;
I'm assuming Site_ID is unique in the Site table?
-Original Message-
From: Stephen P. Fracek, Jr. [mailto:[EMAIL PROTECTED]
Sent: Monday, May 01,
Hi,
MySQL 5.0.21, a new version of the popular Open Source Database
Management System, has been released. The Community Edition is now
available in source and binary form for a number of platforms from our
download pages at
http://dev.mysql.com/downloads/ and mirror sites.
Note that not
I ran mysqlcheck, not myisamchk or REPAIR. Is what you said still true?
-Original Message-
From: Kishore Jalleda [mailto:[EMAIL PROTECTED]
Sent: Monday, May 01, 2006 1:56 PM
To: Robinson, Eric
Cc: mysql@lists.mysql.com
Subject: Re: Fixing Databases When Replication Is Enabled?
On
Thanks that got it.
Robert Gehrig
Webmaster at www.gdbarri.com
e-mail: [EMAIL PROTECTED]
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Yes
On 5/1/06, Robinson, Eric [EMAIL PROTECTED] wrote:
I ran mysqlcheck, not myisamchk or REPAIR. Is what you said still true?
-Original Message-
From: Kishore Jalleda [mailto:[EMAIL PROTECTED]
Sent: Monday, May 01, 2006 1:56 PM
To: Robinson, Eric
Cc: mysql@lists.mysql.com
Subject: Re:
On Apr 26, 2006, at 3:54 AM, Dr. Frank Ullrich wrote:
Duzenbury, Rich wrote:
Hi all,
I've inherited an innodb database that is configured like:
innodb_file_per_table
innodb_data_file_path =
ibdata1:3000M;ibdata2:3000M;ibdata3:3000M;ibdata4:3000M:autoextend
Um, doesn't this allocate 12G that
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