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• MySQL 5 left join unknown column

  - by NP

  I had the below query working in mysql 4.1, but does not in 5.0: SELECT * FROM email e, event_email ee LEFT JOIN member m on m.email=e.email WHERE ee.email_id = e.email_id The error: 1054 (Unknown column 'e.email' in 'on clause')

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• Updated Timestamp field in MySQL through PHP

  - by Vincent

  All, I have a database table in mysql with a field that is of "TIMESTAMP" type. I need help writing the SQL query to update the field with the current timestamp. UPDATE tb_Test set dt_modified = ????? Thanks,

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• MySQL: how to index an "OR" clause

  - by JoséMi

  I'm executing the following query SELECT COUNT(*) FROM table WHERE field1='value' AND (field2 = 1000 OR field3 = 2000) There is one index over field1 and another composited over field2&field3. I see MySQL always selects the field1 index and then makes a join using the other two fields which is quite bad because it needs to join 146.000 rows. Suggestions on how to improve this? Thanks

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• mysql join table - selecting the newest row

  - by cmancre

  Hi, I have the following two MySQL tables TABLE NAMES NAME_ID NAME 1 name1 2 name2 3 name3 TABLE STATUS STATUS_ID NAME_ID TIMESTAMP 1 1 2010-12-20 12:00 2 2 2010-12-20 10:00 3 3 2010-12-20 10:30 4 3 2010-12-20 14:00 I would like to select all info from table NAMES and add most recent correspondent TIMESTAMP column from table STATUS RESULT NAME_ID NAME TIMESTAMP 1 name1 2010-12-20 12:00 2 name2 2010-12-20 10:00 3 name3 2010-12-20 14:00 Am stuck on this one. How do I left join only on the newer timestamp?

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• Connecting VB.NET to a MySQL Database

  - by Bubby4j

  I have a VB.NET application and I need it to be able to display rows from a MySQL database. How would I do this?

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• Efficiently store last X items in an MySQL Database

  - by Saif Bechan

  I want to store the last 3 items in an MySQL database in an efficient way. So when the 4th item is stored the first should be deleted. The way I do this not is first run a query getting the items. Than check what I should do then insert/delete. There has to be a better way to do this. Any suggestions?

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• Easy mysql question regarding primary keys and an insert

  - by MPX

  In mysql, how do I get the primary key used for an insert operation, when it is autoincrementing. Basically, i want the new autoincremented value to be returned when the statement completes. Thanks!

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• Mysql - NOW() function calling

  - by Ockonal

  Hello, I'm using php for making queries for mysql. Here is one: UPDATE `subscribers` SET `curDate` = NOW() WHERE `e_mail` = "$resEmail" curDate - DateTime type. The problem is that after this query curDate of given email is 0000-00-00 00:00:00 What's wrong?

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• Checking if mysql user exists

  - by sergiogx

  How can I check if a user exists? Im doing an installer for a mysql database, and I need to check if a user exits, if not create user, if yes delete user and create it again. this so i can execute the script without worries. thanks.

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• How to put MySQL code into source control?

  - by Jader Dias

  I know I can copy all my MySQL code manually to files and then put those files into source control. But is there any way to do this automatically?

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• Convert a mysql date (datetime) into a better date format using php

  - by dave e

  I some php code which gets info from a mysql database. The problem is that the date is coming out in the format : 2010-02-03 22:21:26 Does anyone know a simple solution to make the date more user friendly format. e.g 2nd march 2010 at 22:21. Thanks

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• How do I prevent sql injection with php and mysql

  - by herrturtur

  I have a form into which the visitor can enter data, and I want to store this data in a mysql database via the $_POST variable. What do I need to prevent sql injection?

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• What Mysql query will return this result?

  - by Lost_in_code

  I have two tables A,B which are related to each other (simplified): A: +-------+---------+ | id | type | +-------+---------+ | 1 | apple | | 2 | orange | | 3 | banana | +-------+---------+ B: +-------+---------+-----------+ | id | a_id | rank | +-------+---------+-----------+ | 1 | 1 | 0.0 | | 2 | 1 | 7.7 | | 3 | 2 | 3.3 | | 4 | 2 | 8.8 | | 5 | 2 | 1.1 | | 6 | 3 | 3.3 | | 7 | 3 | 5.5 | | 8 | 1 | 9.5 | +-------+---------+-----------+ What mysql query will return the following result? Result +-------+---------+-----------+ | id | type | rank | +-------+---------+-----------+ | 1 | apple | 9.5 | | 2 | orange | 1.1 | | 3 | banana | 5.5 | +-------+---------+-----------+

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• How to simulate "MYSQL has gone away" error?

  - by Lost_in_code

  I'm running lots of cron job and once in a while there is a MYSQL has gone away error. I've now written some code to handle the error, but how do I simulate the error on my localhost so that the code can be tested thoroughly?

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• Mysql query for within a specific date

  - by Ajith

  I need to retrieve data from within a specific date range.Anybody can help me to create a query to getting the information within date range 12-12-2009 to 12-15-2009 from a mysql table.(including 12 and 15)

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• Best way to fetch last 4 rows from a result set using mysql

  - by PHP-Prabhu

  Can any one please let me know, that, i need to fetch last 4 rows from a result-set using mysql. The result-set returns totally 6 records. but, i need the records to be fetch from last4...i.e, Record-3 Record-4 Record-5 Record-6

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• PHP & MySQL question user submitted data?

  - by comma

  I was wondering how can I allow users to enter HTML and CSS to the there profiles safely using PHP and MySQL like they do on MySpace.

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• MySQL Order by ASC almost 20 times slower than DESC [closed]

  - by Salman Akram

  Possible Duplicate: MySQL ORDER BY DESC is fast but ASC is very slow Order by DESC is super fast and Order by ASC takes almost 20 times more time. How could it be caused and how could it be solved?

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• Accessing Mysql with JQuery without using php

  - by user326175

  Hi, I'm very new to JQuery, but I was told the one of the cool things about it is you can query a mysql database right from an html page(or in my case a smarty template)with out needing php. I have not found any examples of this so I am asking if someone has one? Thanks

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• migrate a portion of a mysql table to SQLite

  - by daniel

  I have a mysql table set up like so: user_id | document 44 [blob] 44 [blob] 44 [blob] 46 [blob] I'd like to export all of user_id 44's data to an SQLite3 file. Best way to go about this without writing a script that reads the data and dumps it into a SQLite file?

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• Primary key in MySQL: INT(n) or UUID as varchar(36)

  - by SODA

  Does it make sense to use UUID as primary key in MySQL? What would be pros and cons of using UUID instead of regular INT, beside trouble of hand querying?

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• MySQL: SUM in WHERE clause

  - by checcco

  Hi guys, I've got this table CREATE TABLE `subevents` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(150) DEFAULT NULL, `content` text, `class` tinyint(4) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=MyISAM Each row can have a different value in the 'class' field. I'd like to select any number of rows, ordered randomly, as long as the sum of the values in the 'class' field is equal to 100. How could I accomplish it directly in the MySQL query without doing it later in PHP? Thanks everybody!

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• store Current Date & time in MySql Using ASP.net

  - by Khilen

  I want to store the current date & time which can be get by System.DateTime.Now in asp.net but while storing in Mysql it gives Error of Invalid Time.

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• Getting rows which include a value with MySQL

  - by sundowatch

  I have a MySQL query which gets including some vars like that: messages TABLE receiver cols user1 rows : 1,3,5 user2 rows : 2,3 user3 rows : 1,4 I want to get rows which includes '3' value. So I will get 'user1' and 'user2'. I tried that but naturally it doesn't work. mysql_query("SELECT * FROM messages WHERE receiver='3'"); How can I do this?

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• Mysql Trigger to select and delete

  - by Karthick

  Hi, Is this possible, can a trigger in mysql can do a select first and then based on its result do a delete?, both on the same table. Am struggling to get it right. There are duplicate entries in a table, i need to have a trigger which selects and then deletes. Any ideas or thoughts will be really helpful.

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