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  • Counting multiple entries in a MySQL database?

    - by Aaron
    Hi all, I'm trying to count multiple entries in a MySQL database, I know how to use COUNT(), but the exact syntax I want to get the results I need eludes me. The problem: Table structure: ID, CODE, AUTHOR, COUNTRY, TIMESTAMP. Code, Author and Country overlap many times in the table. I am trying to discover if there is one simple query that can be ran to return (using WHERE clause on COUNTRY) the author field, the code field, and then a final field that counts the number of times the CODE was present in the query result. So, theoretically I could end up with an array like: array('author', 'code', 'codeAppearsNTimes'); Authors also have varying codes associated with them, so I don't want the results merged. I suppose the end result would be: 'This author is associated with this code this many times'. Is this possible with MySQL? Thanks in advance.

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  • Mysql through PHP gives a "Can't create/write to file" error

    - by Peter
    The full error is: Message: Mysqli statement execute error : Can't create/write to file '/var/www/zendApp/backup/mysql/1268733580_name.sql' (Errcode: 13) I have tried several things already with the /var/www/ZendApp/backup/mysql directory $chmod 777 mysql $chmod 1777 mysql $chown root:root mysql $chown mysql:mysql mysql But nothing helps. What am I doing wrong here? Do I have to tell mysql somewhere that I can write to that directory?

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  • MYSQL: Error: Cannot add or update a child row: a foreign key constraint fails

    - by DalivDali
    Hi all, Using MySQL on Windows OS, and am getting an error upon attempting to create a foreign key between two tables: CREATE TABLE tf_traffic_stats ( domain_name char(100) NOT NULL, session_count int(11) NULL, search_count int(11) NULL, click_count int(11) NULL, revenue float NULL, rpm float NULL, cpc float NULL, traffic_date date NOT NULL DEFAULT '0000-00-00', PRIMARY KEY(domain_name,traffic_date)) and CREATE TABLE td_domain_name ( domain_id int(10) UNSIGNED AUTO_INCREMENT NOT NULL, domain_name char(100) NOT NULL, update_date date NOT NULL, PRIMARY KEY(domain_id)) The following statement gives me the error present in the subject line (cannot add or update a child row: a foreign key constraint fails): ALTER TABLE td_domain_name ADD CONSTRAINT FK_domain_name FOREIGN KEY(domain_name) REFERENCES tf_traffic_stats(domain_name) ON DELETE RESTRICT ON UPDATE RESTRICT Can someone point me in the right direction of what may be causing the error. I also have a foreign key referencing td_domain_name.domain_id, but I don't think this should be interfering... Appreciate it!

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  • MYSQL - Help with a more complicated Query

    - by Joe
    I have two tables: tbl_lists and tbl_houses Inside tbl_lists I have a field called HousesList - it contains the ID's for several houses in the following format: 1# 2# 4# 51# 3# I need to be able to select the mysql fields from tbl_houses WHERE ID = any of those ID's in the list. More specifically, I need to SELECT SUM(tbl_houses.HouseValue) WHERE tbl_houses.ID IN tbl_lists.HousesList -- and I want to do this select to return the SUM for several rows in tbl_lists. Anyone can help? I'm thinking of how I can do this in a SINGLE query since I don't want to do any mysql "loops" (within PHP).

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  • Error in MySQL Workbench Forward Engineer Stored Procedures

    - by colithium
    I am using MySQL Workbench (5.1.18 OSS rev 4456) to forward engineer a SQL CREATE script. For every stored procedure, the automatic process outputs something like: DELIMITER // USE DB_Name// DB_Name// DROP procedure IF EXISTS `DB_Name`.`SP_Name` // USE DB_Name// DB_Name// CREATE PROCEDURE `DB_Name`.`SP_Name` (id INT) BEGIN SELECT * FROM Table_Name WHERE Id = id; END// The two lines that are simply the database name followed by the delimiter are errors and are reported as such when running the script. As long as they are ignored, it looks like everything gets created just fine. But why would it add those lines? I am creating the database in the WAMP environment which uses MySQL 5.1.36

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  • How does mysql define DISTINCT()

    - by goran
    AFAIK SQL defines two uses of DISTINCT keywords - SELECT DISTINCT field... and SELECT COUNT(DISTINCT field) ... However in one of web applications that I administer I've noticed performance issues on queries like SELECT DISTINCT(field1), field2, field3 ... DISTINCT() on a single column makes no sense and I am almost sure it is interpreted as SELECT DISTINCT field1, field2, field3 ... but how can I prove this? I've searched mysql site for a reference on this particular syntax but could not find any. Does anyone have a link to definition of DISTINCT() in mysql or knows about other authoritative source on this? Best

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  • Error in MySQL Workbench Forward Engineered Stored Procedures

    - by colithium
    I am using MySQL Workbench (5.1.18 OSS rev 4456) to forward engineer a SQL CREATE script. For every stored procedure, the automatic process outputs something like: DELIMITER // USE DB_Name// DB_Name// DROP procedure IF EXISTS `DB_Name`.`SP_Name` // USE DB_Name// DB_Name// CREATE PROCEDURE `DB_Name`.`SP_Name` (id INT) BEGIN SELECT * FROM Table_Name WHERE Id = id; END// The two lines that are simply the database name followed by the delimiter are errors and are reported as such when running the script. As long as they are ignored, it looks like everything gets created just fine. But why would it add those lines? I am creating the database in the WAMP environment which uses MySQL 5.1.36

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  • Mysql: ROLLBACK for multiple queries

    - by Raj
    Hi I have more than three MySql queiries in a PHP script triggered by scheduled task. If a query catch an error, script throw an exception and rollback that Mysql query. It works fine. However if first query works fine, but not 2nd query, throw an exception, it rollback 2nd one but not 1st query. I am using begin_trans(), commit and rollback() for individual queries because Sometimes i need to rollback one query, sometimes all queries. Is there any way to rollback one query or all queries? Thanks in advance UPDATE: I got it working, there was no problem with in begin_trans(), commit and rollback(), the database connection config was different for one query from other queries, crazy code without any comments!!!

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  • How to get top 3 frequencies in MySQL?

    - by Amenhotep
    Hello, In MySQL I have a table called "meanings" with three columns: "person" (int), "word" (byte, 16 possible values) "meaning" (byte, 26 possible values). A person assigns one or more meanings to each word: person word meaning ------------------- 1 1 4 1 2 19 1 2 7 <-- second meaning for word 2 1 3 5 ... 1 16 2 Then another person, and so on. There will be thousands of persons. I need to find for each of the 16 words the top three meanings (with their frequencies). Something like: word 1: meaning 5 (35% of people), meaning 19 (22% of people), meaning 2 (13% of people) word 2: meaning 8 (57%), meaning 1 (18%), meaning 22 (7%) ... Is it possible to solve this with a single MySQL query? (If this problem is a classic one and has been answered elsewhere, I would appreciate if you could give me a link to the solution.) Thank you very much, ve

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  • MySQL floating point comparison issues

    - by Sharief
    I ran into an issue by introducing floating point columns in the MySQL database schema that the comparisons on floating point values don't return the correct results always. 1 - 50.12 2 - 34.57 3 - 12.75 4 - ...(rest all less than 12.00) SELECT COUNT(*) FROM `users` WHERE `points` > "12.75" This returns me "3". I have read that the comparisons of floating point values in MySQL is a bad idea and decimal type is the better option. Do I have any hope of moving ahead with the float type and get the comparisons to work correctly?

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  • Which MySQL Fork/Version to Pick??

    - by Drew
    As most of you know, Sun acquired MySQL (and later Oracle acquired Sun), and during these acquisitions, there were a lot of FUD in MySQL community which resulted in creation of various forks. Today we have MySQL from MySQL, Percona (XtraDB) MySQL, OurDelta MySQL, MariaDB, Drizzle to name a few. Which brings us to the source of the problem. We are in the process of upgrading our databases (hardware/software) and I would like to know which one of the forks should I go with. Each has their own set of pros/cons. We are currently using MySQL 5.0.x from MySQL/Linux on an 8-core machine. Our new hardware is a monster with 32 cores and 32GB of memory connecting to a fast NetApp Storage via FC. I would like to stick with MySQL from MySQL but I have heard horror stories on how badly MySQL 5.1 performs on many cores. I have also heard that MySQL 5.4 performs better on multi-core machines but that's still not production ready. In addition, I have also heard a lot of good things about Percona builds. This is what I know so far: MySQL 5.1 from MySQL: Reliable choice, but doesn't scale well on a big machine Percona: Scales well, good backing company. I don't have much experience with it MariaDB: Don't know much about it besides that it was founded by Original MySQL developers (including Monty) OurDelta: Don't know much Drizzle: Mostly optimized for cloud computing I would like to know what's the general notion about this problem. Which build/version should I go with? How are you guys picking your builds/versions? Thanks!

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  • MySQL Trigger with dynamic table name

    - by Thomas
    I've look around a bit and can't quite find an answer to my problem: I want a trigger to execute after an insert on a table and to take that data that is being inserted and do two things Create a new table from the client id and partner id Insert the 'data' that just was inserted into the new table I am fairly new to the Stored procedures and triggers so I came up with this but am having difficulty debugging it: delimiter $$ CREATE TRIGGER trg_creas_insert BEFORE INSERT ON tracking.creas for each row BEGIN DECLARE @tableName varchar(40); DECLARE @createStmnt mediumtext; SET @tableName = concat('crea_','_', NEW.idClient_crea,'_',NEW.idPartenaire_crea); SET @createStmnt = concat('CREATE TABLE IF NOT EXISTS', @tableName, '( `data_crea` mediumtext NOT NULL ) ENGINE=MyISAM AUTO_INCREMENT=29483330 DEFAULT CHARSET=utf8 PACK_KEYS=0'); PREPARE stmt FROM @createStmnt; EXECUTE stmt; INSERT INTO @tableName (data_crea) values (NEW.data_crea); END$$ delimiter ; Thoughts?

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  • Retrieving data from MySQL in one SQL statement

    - by james.ingham
    Hi all, If I'm getting my data from Mysql like so: $result = $dbConnector->Query("SELECT * FROM branches, businesses WHERE branches.BusinessId = businesses.Id ORDER BY businesses.Name"); $resultNum = $dbConnector->GetNumRows($result); if($resultNum > 0) { for($i=0; $i < $resultNum; $i++) { $row = $dbConnector->FetchArray($result); // $row['businesses.Name']; // $row['branches.Name']; echo $row['Name']; } } Does anyone know how to print the field Name in businesses and how to print the name from branches? My only other alternative is to rename the fields or to call Mysql with two seperate queries. Thanks in advance

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  • Creating a foreign key in MySQL produces error:

    - by SnOrfus
    I'm trying to create a foreign key on a table in MySQL and I'm getting a strange error that there seems to be little info about in any of my searches. I'm creating the key with this (emitted from mysql workbench 5.2): ALTER TABLE `db`.`appointment` ADD CONSTRAINT `FK_appointment_CancellationID` FOREIGN KEY (`CancellationID` ) REFERENCES `db`.`appointment_cancellation` (`ID` ) ON DELETE NO ACTION ON UPDATE NO ACTION , ADD INDEX `FK_appointment_CancellationID` (`CancellationID` ASC) ; at which point I get the error: ERROR 1452: Cannot add or update a child row: a foreign key constraint fails (alarmtekcore., CONSTRAINT FK_lead_appointment_CancellationID FOREIGN KEY (CancellationID) REFERENCES lead_appointment_cancellation (`) I've checked here but there's no data in the table.

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  • reset root password in mysql without access to mysql table

    - by Rik89
    I am having an issue on OS X 10.7.5 as I used to use MAMP but for .htaccess issues I am now using my own compiled local server from a long time ago, the problem is i forgot the root password for mysql. I have tried updating the password through terminal using mysql -u root, but I get this error message - ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) Thanks Ric

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  • MySQL IDE recommendation?

    - by Maxim Veksler
    Hello, I've been wondering what you guys are using to write,debug,test your SQL queries there days? The requirements are quite simple: Auto-complete Syntax Highlighting SQL Hisotry Good UI There are some tools which are common for this task, each with his own problems. To name a few Mysql Query Browser MySQL Workbench (GA?, Beta?) Eclipse Database development perspective Oracle SQL Developer with Connector/J I won't go into why none of them is perfect, trust me they all have their problems. So, what are you guys using?

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  • Running mysql 5.5 on centos 5.9

    - by gerrytan
    I installed mysql using yum install mysql-server on centos 5.9 and realized it's version 5.0. I need version 5.5 so then I did yum install mysql55-server however I couldn't find a way to start server version 5.5 instead of 5.0. service mysqld start will start 5.0 server and removing mysql 5.0 doesn't help either because service mysqld start fail to find mysqld service Update 1 Nov 2013: I noticed mysql55 package was being installed to /opt/rh/mysql55/root/usr/bin, so I appended that into the start of my PATH env var but service mysqld start still runs 5.0 server. If I tried running the server using mysqld_safe located on above mysql55 path but it says [root@***** bin]# mysqld_safe Use "scl enable mysql55 'service ...'" invocation Not quite sure what it means. I checked the running mysql version by connecting to it using mysql command line client. [root@***** bin]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 2 Server version: 5.0.95 Source distribution

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  • MySQL tmpdir on /dev/shm with SELinux

    - by smorfnip
    On RHEL5, I have a small MySQL database that has to write temp files. To speed up this process, I would like to move the temporary directory to /dev/shm by putting the following line into my.cnf: tmpdir=/dev/shm/mysqltmp I can create /dev/shm/mysqltmp just fine and do chown mysql:mysql /dev/shm/mysqltmp chcon --reference /tmp/ /dev/shm/mysqltmp I've tried to make SELinux happy by applying the same settings that are in effect for /tmp/ (and /var/tmp/), which is presumably where MySQL is writing its tmp files if tmpdir is undefined. The problem is that SELinux complains about MySQL having access to that directory. I get the following in /var/log/messages: SELinux is preventing mysqld (mysqld_t) "getattr" to /dev/shm (tmpfs_t). SELinux is a hard mistress. Details: Source Context root:system_r:mysqld_t Target Context system_u:object_r:tmpfs_t Target Objects /dev/shm [ dir ] Source mysqld Source Path /usr/libexec/mysqld Port <Unknown> Host db.example.com Source RPM Packages mysql-server-5.0.77-3.el5 Target RPM Packages Policy RPM selinux-policy-2.4.6-255.el5_4.1 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall_file Host Name db.example.com Platform Linux db.example.com 2.6.18-164.2.1.el5 #1 SMP Mon Sep 21 04:37:42 EDT 2009 x86_64 x86_64 Alert Count 46 First Seen Wed Nov 4 14:23:48 2009 Last Seen Thu Nov 5 09:46:00 2009 Local ID e746d880-18f6-43c1-b522-a8c0508a1775 ls -lZ /dev/shm shows drwxrwxr-x mysql mysql system_u:object_r:tmp_t mysqltmp and permissions for /dev/shm itself are drwxrwxrwt root root system_u:object_r:tmpfs_t shm I've also tried chcon -R -t mysqld_t /dev/shm/mysqltmp and setting the group on /dev/shm to mysql with no better results. Shouldn't it be enough to tell SELinux, hey, this is a temp directory just like MySQL was using before? Short of turning off SELinux, how do I make this work? Do I need to edit SELinux policy files?

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  • how to enable remote access to a MySQL server on an AZURE virtual machine

    - by Rees
    I have an AZURE virtual machine with a MySQL server installed on it running ubuntu 13.04. I am trying to remote connect to the MySQL server however get the simple error "Can't connect to MySQL server on {IP}" I have already done the follow: * commented out the bind-address within the /etc/mysql/my.cnf * commented out skip-external-locking within the same my.cnf * "ufw allow mysql" * "iptables -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT" * setup an AZURE endpoint for mysql * "sudo netstat -lpn | grep 3306" does indeed show mysql LISTENING * "GRANT ALL ON *.* TO remote@'%' IDENTIFIED BY 'password'; * "GRANT ALL ON *.* TO remote@'localhost' IDENTIFIED BY 'password'; * "/etc/init.d/mysql restart" * I can connect via SSH tunneling, but not without it * I have spun up an identical ubuntu 13.04 server on rackspace and SUCCESSFULLY connected using the same procedures outlined here. NONE of the above works on my azure server however. I thought the creation of an endpoint would work, but no luck. Any help please? Is there something I'm missing entirely?

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  • Why the huge difference between etch and lenny MySQL

    - by rmarimon
    I've been working on a program for the last year. The development environment is working with a database in MySQL running on debian etch version mysql Ver 14.12 Distrib 5.0.32, for pc-linux-gnu (i486) using readline 5.2. The production environment is working on debian lenny with version mysql Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2. I was just timing some database access and what takes in the development environment 150 seconds, takes 300 in the production environment. I checked the /etc/mysql/my.cnf files on both systems and the only differences are # development bind-address = 10.168.1.82 log_bin = /var/log/mysql/mysql-bin.log # production bind-address = 127.0.0.1 myisam-recover = BACKUP #log_bin = /var/log/mysql/mysql-bin.log I dump a database from the production and load it into the development and with the same server everything takes half the time !!! What should I check?

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  • Show table gives - ERROR 2002 (HY000): Can't connect to local MySQL server through socket

    - by arn
    I am having the InnodB tables and show tables gives following error ? mysql (mydb) > show tables; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 1 Current database: mydb ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock1' (111) ERROR: Can't connect to the server

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  • Install php-fpm + php-mysql + MariaDB on Centos from repos

    - by Alexander
    I try to take CentOS 6.4 x64 and install nginx w/ php-fpm on it (and that's easy part, no problem at all), then add php-mysql package and MariaDB as a mysql drop-in replacement. And here I face the hang... I've added epel, nginx and remi repos, add priority=10 line to its .repo files, and now as I install MariaDB-server the dependency also brings me MariaDB's "common" package. Then, as I try to install php-mysql, I see file /usr/share/mysql/french/errmsg.sys from install of MariaDB-server-5.5.27-1.x86_64 conflicts with file from package mysql-libs-5.5.28-1.el6.remi.x86_64 warnings. If I deinstall MariaDB server, I'm able to install mysql-libs and php-mysql, but it won't allow me to install MariaDB later. Is there any way to escape that (infinite) loop? I believe the solution is simple but still can't see it. Please help to install php-fpm + php-mysql and MariaDB as DB server!

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