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  • mySQL: Joining three tables - how?

    - by Industrial
    Hi everybody, I have the following query in my application. It works well, but I need it to also contain the number of products that are associated with each manufacturer. The current query: SELECT * FROM (`manufacturers`) JOIN `languages` ON `manufacturers`.`lang` = `languages`.`id` ORDER BY `languages`.`id` asc, `id` asc My products table looks like this: id | name | manufacturerid 0 | Product1 | 0

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  • MySQL: fetching a null or an empty string

    - by Oden
    Hey, I know whats the difference between a NULL value and an empty string ("") value, but if I want to get a value by using the OR keyword, I get no result for a NULL value The table i want to query looks like this: titles_and_tags +----+----------+------+ | id | title | tag | +----+----------+------+ | 1 | title1 | NULL | | 2 | title2 | tag1 | | 3 | title3 | tag2 | +----+----------+------+ The query i use looks like this: select * from `titles_and_tags` WHERE `title` LIKE "title" AND `tag` = "tag1" OR `tag` IS NULL So i want to get here a rows (id: 1,2), BUT this results 0 rows. What have i done wrong?

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  • MySQL multiple dependent subqueries, painfully slow

    - by matt80
    I have a working query that retrieves the data that I need, but unfortunately it is painfully slow (runs over 3 minutes). I have indexes in place, but I think the problem is the multiple dependent subqueries. I've been trying to rewrite the query using joins but I can't seem to get it to work. Any help would be greatly appreciated. The tables: Basically, I have 2 tables. The first (prices) holds the prices of items in a store. Each row is the price of an item that day, and new rows are added every day with an updated price. The second table (watches_US) holds the item information (name, description, etc). CREATE TABLE `prices` ( `prices_id` int(11) NOT NULL auto_increment, `prices_locale` enum('CA','DE','FR','JP','UK','US') NOT NULL default 'US', `prices_watches_ID` char(10) NOT NULL, `prices_date` datetime NOT NULL, `prices_am` varchar(10) default NULL, `prices_new` varchar(10) default NULL, `prices_used` varchar(10) default NULL, PRIMARY KEY (`prices_id`), KEY `prices_am` (`prices_am`), KEY `prices_locale` (`prices_locale`), KEY `prices_watches_ID` (`prices_watches_ID`), KEY `prices_date` (`prices_date`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=61764 ; CREATE TABLE `watches_US` ( `watches_ID` char(10) NOT NULL, `watches_date_added` datetime NOT NULL, `watches_last_update` datetime default NULL, `watches_title` varchar(255) default NULL, `watches_small_image_height` int(11) default NULL, `watches_small_image_width` int(11) default NULL, `watches_description` text, PRIMARY KEY (`watches_ID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; The query retrieves the last 10 prices changes over a period of 30 hours, ordered by the size of the price change. So I have subqueries to get the newest price, the oldest price within 30 hours, and then to calculate the price change. Here's the query: SELECT watches_US.*, prices.*, watches_US.watches_ID as current_ID, ( SELECT prices_am FROM prices WHERE prices_watches_ID = current_ID AND prices_locale = 'US' ORDER BY prices_date DESC LIMIT 1 ) as new_price, ( SELECT prices_date FROM prices WHERE prices_watches_ID = current_ID AND prices_locale = 'US' ORDER BY prices_date DESC LIMIT 1 ) as new_price_date, ( SELECT prices_am FROM prices WHERE ( prices_watches_ID = current_ID AND prices_locale = 'US') AND ( prices_date >= DATE_SUB(new_price_date,INTERVAL 30 HOUR) ) ORDER BY prices_date ASC LIMIT 1 ) as old_price, ( SELECT ROUND(((new_price - old_price)/old_price)*100,2) ) as percent_change, ( SELECT (new_price - old_price) ) as absolute_change FROM watches_US LEFT OUTER JOIN prices ON prices.prices_watches_ID = watches_US.watches_ID WHERE ( prices_locale = 'US' ) AND ( prices_am IS NOT NULL ) AND ( prices_am != '' ) HAVING ( old_price IS NOT NULL ) AND ( old_price != 0 ) AND ( old_price != '' ) AND ( absolute_change < 0 ) AND ( prices.prices_date = new_price_date ) ORDER BY absolute_change ASC LIMIT 10 How would I rewrite this to use joins instead, or otherwise optimize this so it doesn't take over 3 minutes to get a result? Any help would be greatly appreciated! Thank you kindly.

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  • get-wmiobject sql join in powershell - trying to find physical memory vs. virtual memory of remote s

    - by Willy
    get-wmiobject -query "Select TotalPhysicalMemory from Win32_LogicalMemoryConfiguration" -computer COMPUTERNAME output.csv get-wmiobject -query "Select TotalPageFileSpace from Win32_LogicalMemoryConfiguration" -computer COMPUTERNAME output.csv I am trying to complete this script with an output as such: Computer Physical Memory Virtual Memory server1 4096mb 8000mb server2 2048mb 4000mb

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  • How can this SQL be wrong? What am I not seeing?

    - by ropstah
    Can anybody please spot my error, this should be a legal query in SQL shouldn't it?? Unknown column u.usr_auto_key in the ON clause This is the database schema: User: (usr_auto_key, name, etc...) Setting: (set_auto_key, name etc..) User_Setting: (usr_auto_key, set_auto_key, value) And this is the query... SELECT `u`.`usr_auto_key` AS `u__usr_auto_key`, `s`.`set_auto_key` AS `s__set_auto_key`, `u2`.`usr_auto_key` AS `u2__usr_auto_key`, `u2`.`set_auto_key` AS `u2__set_auto_key`, `u2`.`value` AS `u2__value` FROM `User` `u`, `Setting` `s` LEFT JOIN `User_Setting` `u2` ON `u`.`usr_auto_key` = `u2`.`usr_auto_key` WHERE (`s`.`sct_auto_key` = 1 AND `u`.`usr_auto_key` = 1 AND admin_property is null)

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  • Data from two tables without repeating data from the first?

    - by Aran
    I have two tables. Users table and Users Meta Table I am looking for a way to get all the information out of both tables with one query. But without repeating the information from Users table. This is all information relating to the users id number as well. So for example user_id = 1. Is there a way to query the database and collect all the information I from both tables without repeating the information from the first?

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  • Mysql - GROUP BY Avoid using tempoary

    - by jwzk
    The goal of this query is to get a total of unique records (by IP) per ref ID. SELECT COUNT(DISTINCT ip), GROUP_CONCAT(ref.id) FROM `sess` sess JOIN `ref` USING(row_id) WHERE sess.time BETWEEN '2010-04-21 00:00:00' AND '2010-04-21 23:59:59' GROUP BY ref.id ORDER BY sess.time DESC The query works fine, but its using a temporary table. Any ideas?

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  • NUL symbol gets inserted anywhere in the XML

    - by Racs
    I am using Oracle 11g and when I query data from database manually, it looks ok. But when I view it using Notepad++, there is a special character that gets inserted anywhere in the xml produced. Please see image below: I tried everything and deleted some parts of the xml, updated the db and query again but the invalid character just differ in location. Any idea is much appreciated, thanks! Best regards, Racs

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  • Aptitude command on fedora

    - by danielrutledge
    Hi, linux newbie here. I'm running Fedora 12 and I have a script for Ubuntu installing a bunch of packages using aptitude. I tried installing the packages using yum, but most of them aren't available. The packages aren't very new or complicated stuff, is there any way get packages through aptitude on fedora? Or am I just going to have to find the Fedora equivalent of each package manually, for example the first package installed is g++ and of course this has a fedora equivalent.

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  • Perfmon - Redirector current command 0 result

    - by Dave
    I'd like to monitor how many SMB connections there are at any given time for my 2008R2 file server, but when I add Redirector/Current Commands in perfmon, I get 0 results. This KB from Microsoft isn't exactly helpful either: http://support.microsoft.com/kb/2523382 It mearly confirms there is an issue, but doesn't provide a work around. How would I go about getting the current number of SMB connections? Thanks for your help in advance.

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  • Command line DVD to ISO ripper

    - by RandomInsano
    I have an old XBOX with XBMC installed and I want to rip my dvd collection to my home server as ISO files so that I can watch them over the network. My server is headless (no monitor), so I need the software to run on Solaris, Linux or OpenBSD without X11 running. Does such a magical tool exist? I've seen vobcopy, but does that only work on VOBs? Since XBMC supports DVD menus and everything as though it was a straight disc, I'd rather have my backup work exactly as it does without needing my DVD.

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  • iptables command

    - by neha soni
    how can i start/stop the iptables service on ubuntu?? i hav tried "service iptables stop" but it is giving "unrecognized service". why is it doing so??? is there any other method???

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  • Access denied when starting SQL Server Express from command line

    - by Brettski
    Windows 7 computer running SQL Server Express 2008 (sp1). When I try to run net start mssql$sqlexpress I receive an error: System error 5 has occurred. Access is denied The SQL service is running under "Network Service" account The service starts fine if I use the services window. Could somebody help me figure out why I am receiving this error?

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  • vagrant up command very slow on OS X Lion

    - by Andy Hume
    When I run vagrant up to provision a new VM on Lion it takes an extremely long time, during which the entire Mac is very laggy and unresponsive. The output is as follows, the key point being the "notice: Finished catalog run in 754.28 seconds" > vagrant up [default] Importing base box 'lucid64'... [default] The guest additions on this VM do not match the install version of VirtualBox! This may cause things such as forwarded ports, shared folders, and more to not work properly. If any of those things fail on this machine, please update the guest additions and repackage the box. Guest Additions Version: 4.1.0 VirtualBox Version: 4.1.6 [default] Matching MAC address for NAT networking... [default] Clearing any previously set forwarded ports... [default] Forwarding ports... [default] -- ssh: 22 => 2222 (adapter 1) [default] -- web: 80 => 4567 (adapter 1) [default] Creating shared folders metadata... [default] Running any VM customizations... [default] Booting VM... [default] Waiting for VM to boot. This can take a few minutes. [default] VM booted and ready for use! [default] Mounting shared folders... [default] -- v-root: /vagrant [default] -- v-data: /var/www [default] -- manifests: /tmp/vagrant-puppet/manifests [default] Running provisioner: Vagrant::Provisioners::Puppet... [default] Running Puppet with lucid64.pp... [default] stdin: is not a tty [default] notice: /Stage[main]/Lucid64/Exec[apt-update]/returns: executed successfully [default] [default] notice: /Stage[main]/Lucid64/Package[apache2]/ensure: ensure changed 'purged' to 'present' [default] [default] notice: /Stage[main]/Lucid64/File[/etc/motd]/ensure: defined content as '{md5}a25e31ba9b8489da9cd5751c447a1741' [default] [default] notice: Finished catalog run in 754.28 seconds [default] [default] err: /File[/var/lib/puppet/rrd]/ensure: change from absent to directory failed: Could not find group puppet [default] [default] err: Could not send report: Got 1 failure(s) while initializing: change from absent to directory failed: Could not find group puppet [default] [default] Running provisioner: Vagrant::Provisioners::Puppet... [default] Running Puppet with lucid64.pp... [default] stdin: is not a tty [default] notice: /Stage[main]/Lucid64/Exec[apt-update]/returns: executed successfully [default] [default] notice: Finished catalog run in 2.05 seconds [default] [default] err: /File[/var/lib/puppet/rrd]: Could not evaluate: Could not find group puppet [default] [default] err: Could not send report: Got 1 failure(s) while initializing: Could not evaluate: Could not find group puppet [default] [default] Running provisioner: Vagrant::Provisioners::Puppet... [default] Running Puppet with lucid64.pp... [default] stdin: is not a tty [default] notice: /Stage[main]/Lucid64/Exec[apt-update]/returns: executed successfully [default] [default] notice: Finished catalog run in 1.36 seconds [default] [default] err: /File[/var/lib/puppet/rrd]: Could not evaluate: Could not find group puppet [default] [default] err: Could not send report: Got 1 failure(s) while initializing: Could not evaluate: Could not find group puppet [default] >

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  • Disable "longhaul" kernel module with a GRUB command?

    - by Julian Schweigert
    I've got a problem with a VIA C3 (1GHz)-system: the system freezes immediately when the CPU frequency goes under 731MHz because of an incompatibility with the (not completely implemented) i686 commands and a powersave feature of the kernel. There is a workaround: deactivate the "longhaul" kernelmodule via alias longhaul off in /etc/modprobe.d/aliases. But the system freezes before I can install any Linux distribution - even Clonezilla freezes. Is there a possibility to deactivate the module with a GRUB boot parameter before the kernel is loaded?

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