MySQL Innodb indexing confusion

A very basic database design question: I'm creating a very large table with the following columns: Employee_Name(VARCHAR), Employee_ID(INT), Employee_Birthday(INT). I wish to create a single column b-tree index for Employee_ID, as many of my queries

Draw multiple sets of php JSON import to Highcharts

because I'm pretty new to JS, I can't understand how to implement multiple data series into my code Here is my php page that I use as data grabber: getTrendData-TIMEREQUESTED-hms.php <?php //Define possible Argument request $format = $_GET['format'];

MySQL: return the first line of the join

I have 2 tables "quizzes" & "users", I need to return list of first user took each quiz, with quiz_id: tables structure "quizzes" structure: id name 1 England 2 france 3 Japan 4 USA 5 UAE 6 Sweden 7 Italy 8 Brazil 9 South

How can I cancel a transaction on an error in MySQL?

update my_table set limit_id = 2 where id='176846'; start transaction; update my_table set limit_id = 1 where id='176846'; update my_table set limit_id = 4 where id='176846'; -- <- this one fails commit; select limit_id from my_table where id='176846

Php and mysql syntax issues using update instructions

i am trying to figure out the syntax problem in my query the block of code goes like this: $updatequery = "update patient_dim set dentist_id = $dentist_id where". "patient_id = $patient_id"; $queryResult = mysql_query($updatequery,$con

The timestamp of MySQL records has changed

I changed my server time using this command cp /usr/share/zoneinfo/US/central etc/localtime Ever since I changed the server time. All my MySQL records have changed the timestamp fields 6 hours ahead. I tried changing the time back and the records won

What kind of JOIN to use? mysql

I have a query where all products sold are being selected. What I want to do is reverse the query and get all product not sold within a period of time. This is the query for all the products sold within a period of time. SELECT product.product_id, pr

SQL gets ROW_NUMBER and COUNT on every SELECT query

I´m building a grid mechanism where I need to retrieve data from Database the total or records found, retrieving just a range of these records with a row_number in it. I´m using SqlServer for testing, but I need to support that on Oracle and MySql as

The inscription script.php does not work

I have a registration script that doesn't work. It used to work but then suddenly it stopped working. I dont know what I've done or what happend. I have tried for like an hour now to find out where the problem is, but I can't seem to find it. What ha

get data from the table where a field is maximal in a query

i want to get data from my database where one field is max, at this moment i do this in 2 queries. the thing is i dont want to overload the server so i am looking for a way to make it in 1 query. any suggestions? as you can see i am looking for entry

QtSql vs MySQLdb vs SQLAlchemy

I'm developing a PyQt program that will soon switch from an xml type backend to one hosted on a local MySQL server. I've been trying to read around about each of the three options, but thought it might be best to ask ye SO gods. My current experience

MySQL Query - Add Columns & amp; rows

I currently have two tables, one is products and the other is options (colour, size, etc). If no options are specified for the product, it puts the stock against the product table Otherwise it will put the stock against the option table Tables look a

MSSQL - & gt; MySQL or PostgreSQL database replication

I find myself in a situation that someone else must have got stuck in at some point. Our company runs an in house MSSQL based database, our website then sits on an external server and currently runs MySQL. The problem comes that both databases need t

How to use master / slave mysql in game setting

My application is getting a lot of database calls hence I need to start using a distributed master/slave mysql database but I'm having problems configuring play framework! so my first question is that if it is actually possible to configure hibernate

Generic LIKE with multiple fields and spaces in MYSQL

I'm having some trouble searching for any similar match in two fields. For example I have a table with the values: CAR MAKE CAR MODEL Ford Mustang (Shelby) Toyota Corolla Seat Leon etc etc. I want to be able to get the result "Ford, Mustang (Shelby)&

Total sum of two requests

I have two basic queries which I need to sum the totals of: Select hours, sum(hours) FROM table WHERE name='xxx' and Description='Worked' Select hours2, sum(hours2) FROM table WHERE name='xxx' and Description2='Worked' I've tried UNION and it will ge

php: Mysql Database Design and Workflow, need more creativity!

i was wondering if any one can help me with my php-mysql design my current app. (is a more or less survey app) it let users store questions about targeting specific features in other products also saved in other table in database ! for example , a us

php + mysql_num_rows

is there a more efficient way of doing the following? $total_a = mysql_query("SELECT `id` FROM `table` WHERE `this` = 'that'"); $total_b = mysql_num_rows($total_a); if(!$total_b) { echo 'no results'; } else { $a = mysql_query("SELECT `id`,

mod rewrite, title slugs and htaccess

I have been taken in to provide some SEO guidance on a website which has been running since 2005. My problem is I want to use clean URLs. The code that handles the URL is hidden away in some class file. And with over a few thousand lines of code its

MySQL count included in the jSon object

I made a php/ajax/mysql/json script for my site, to show all the tags. If I GET the page id it will show me all the tags of that page. But! In my main page i'd like to show all tags, from all pages WITH a counter. For example if I tagged 4 pages with

Mysql query with group by and order by

I have a table like this: .--------------------------------. | Name | XX | Date | .--------------------------------. | N1 | 5 | 2009-05-01 | | N1 | 10 | 2008-01-08 | | N2 | 8 | 2009-02-02 | .________________________________. My result should be this: