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• seperated mysql statement query in php

  - by stone

  So, I can run the following statements from within mysql itself successfully. SET @fname = 'point1'; SELECT * FROM country WHERE name=@fname;` But when I try to pass the query through php like this and run it, I get an error on the second line $query = "SET @fname = 'point1';"; $query .= "SELECT * FROM country WHERE name=@fname;";

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• Storing MySQL GUID/UUIDs

  - by thr

  This is the best way I could come up with to convert a MySQL GUID/UUID generated by UUID() to a binary(16): UNHEX(REPLACE(UUID(),'-','')) And then storing it in a BINARY(16) Are there any implications of doing it this way that I should know of?

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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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• Scanning a mysql table from the bottom

  - by ming yeow

  When i run a mysql select statement, it takes very long because i have already previously deleted a very large number of rows. Is there a way for the table to start scanning from the bottom, as opposed to from the top?

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• MySQL LINES TERMINATED BY

  - by Brian

  What are the potential choises for LINES TERMINATED BY in MySQL. I have a CSV file that I am trying to upload and neither \r\n, \n, not \r work.

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• Mysql optimization

  - by Jens

  I have this mysql table called comments which looks like this: commentID parentID type userID date comment The commentID is set as Primary key, but most of the time I fetch the data using the parentID. How should I set my indexes? Should I just add an index on parentID and let commentID be the primary key?

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• How to store data which contains quotes in MySQL

  - by Nitz

  In one of my forms I use the rich text editor from Yahoo!. Now i want to store the data from that textarea in a MySQL database. The user can enter anything in that textarea, e.g. many double or single quotes. How can I store that data? Normally we store by adding that data in one variable and then put that in sql, but the quotes cause problems.

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• have mysql select statement return fully qualified column names like table.field

  - by handsomeGun

  is there a way to have a mysql select statement return fully qualified column names like "table.field" without using AS for every single field? like so: SELECT * FROM table1 LEFT JOIN table2 on table1.f_ID = table2.ID and the result would be: "table1.ID", "table1.name", "table2.ID", "table2.name", ...

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• MySQL - Update the same column twice

  - by uzioriluzan

  Hello, I need to update a column in a mysql table. If I do it in two steps as below, is the column "col" updated twice in the disk ? update table SET col=3*col, col=col+2; or is it written only once as in : update table SET col=3*col+2; Thanks

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• Python and MySQL

  - by omfgroflmao

  Is there an easy way (without downloading any plugins) to connect to a MySQL database in Python? Also, what would be the difference from calling a PHP script to retrieve the data from the database and hand it over to Python and importing one of these third-parties plugins that requires some additional software in the server.

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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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• binlog_format = STATEMENT and CURRENT_TIMESTAMP with MySQL replication

  - by xma

  Hi, can a MySQL slave instance have different row values for the same ID when binlog_format is set to STATEMENT and we insert something like: insert into foo values(CURRENT_TIMESTAMP) As I understand it, the slave read the SQL statement and execute it thus, if the replication is lagging, could lead to differences for the same row. Right or wrong ? How can I avoid this situation ? Thank you.

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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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• Insert or update when product is present using mysql

  - by Aryan

  main_product table productid outward shopid 333 2 44//present 343 4 44//present 353 5 44//present 363 1 44//present 373 2 44//not present min_product table productid outward shopid 333 1 44 343 1 44 353 1 44 363 1 44 SELECT DISTINCT (A.productid),A.outward, B.productid,B.outward FROM main_product A INNER JOIN min_product B on B.productid=A.product_id where A.shopid='44' and B.shopid='44' my question how can i INSERT OR UPDATE in one query using mysql by checking if it is present or not if present update else insert something like this? INSERT INTO mytable (key, value) VALUES ($newkey, $newvalue) ON DUPLICATE KEY UPDATE SET value = $newvalue

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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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• 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 - 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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