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MySQL - an FAQ

We're becoming a serious MySQL resource, with many technical articles, examples, forum posts and blog entries answering those difficult-to-resolve issues you may have come across. You might like to bookmark (or link to) this page.

Eleven recent articles on MySQL ...

Flashbulb moments - facts that clarify the "what" and "how" of MySQL

Copying databases and tables

Saving a result set locally for use in a spreadsheet

Setting up and running master and slave servers (replication)

Finding Orphan (unconnected) records in a database

How to translate a requirement to a table design

Complex select example - UNION, HAVING, GROUP etc

Exact, like and fuzzy matching of criteria

A PHP tool for ad-hoc MySQL queries

Joining a table to itself

Summing or averaging a column for each unique value in another column

and some old favourites:

What to do when you have a running system and realise that the design needs an overhaul

The difference between a JOIN and a LEFT JOIN

Uploading, storing and retrieving images in a BLOG

Writing joins of more than two tables

How to design and implement a many-to-many mapping

When to break the rules of normalisation

The vital difference between "Empty" and "Don't Know"

Optimising Selects

Using old client programs (4.0 and prior) on new servers (4.1 and later)

Other MySQL nuggets
(written 2005-12-03, updated 2006-06-09)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
H113 - Using MySQL Databases in PHP Pages
  [4483] Moving from mysql to mysqli - simple worked example - (2015-05-03)
  [4378] What FGW passengers want to talk about / and PHP programming to find out - (2015-01-01)
  [3455] MySQL, MySQLi, PDO or something else - how best to talk to databases from PHP - (2011-09-24)
  [3035] How to display information from a database within a web page - (2010-11-07)
  [2628] An example of an injection attack using Javascript - (2010-02-08)
  [2561] The future of MySQL - (2010-01-03)
  [2447] MySQL stored procedures / their use on the web from PHP - (2009-10-10)
  [2432] Using print_r in PHP to explore mysql database requests - (2009-10-01)
  [2320] Helping new arrivals find out about source code examples - (2009-08-03)
  [2259] Grouping rows for a summary report - MySQL and PHP - (2009-06-27)
  [2071] Setting up a MySQL database from PHP - (2009-03-08)
  [1983] Keeping PHP code in database and running it - (2009-01-09)
  [1561] Uploading to a MySQL database through PHP - examples and common questions - (2008-03-02)
  [1010] Dates, times, clickable diarys in PHP - (2006-12-28)
  [947] What is an SQL injection attack? - (2006-11-27)
  [937] Display an image from a MySQL database in a web page via PHP - (2006-11-22)
  [915] Paging through hundreds of entries - (2006-11-05)
  [723] Viewing images held in a MySQL database via PHP - (2006-05-17)
  [666] Database design - get it right from first principles - (2006-04-02)
  [647] Checking for MySQL errors - (2006-03-15)
  [581] Saving a MySQL query results to your local disc for Excel - (2006-01-29)
  [572] Giving the researcher power over database analysis - (2006-01-22)
  [104] mysql_connect or mysql_pconnect in PHP? - (2004-10-30)

J811 - Java - JDBC - Relational Database Access
  [3046] Java Beans, tag libraries and JSPs - what and why. - (2010-11-13)
  [2861] MySQL and Java - connectivity past, present, and future thoughts - (2010-07-09)
  [2154] Bean Classes in Java and Java Database Connections - (2009-05-02)

P308 - Using SQL Databases from Perl
  [3099] Perl - database access - DBD, DBI and DBIx modules - (2010-12-22)
  [2381] Checking the database connection manually - (2009-08-28)
  [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23)
  [1885] Hiding a MySQL database behind a web page - (2008-11-15)
  [1224] Object Relation Mapping (ORM) - (2007-06-09)
  [975] Answering ALL the delegate's Perl questions - (2006-12-09)
  [644] Using a MySQL database from Perl - (2006-03-13)

S151 - Introduction to SQL and MySQL
  [3928] Storing your intermediate data - what format should you you choose? - (2012-11-20)
  [3269] Files or Databases? MySQL, SQLite, or Oracle? - (2011-04-28)
  [2786] Factory methods and SqLite in use in a Python teaching example - (2010-05-29)
  [2567] Extra MySQL course dates (2 day course, UK) - (2010-01-08)
  [2134] Oracle take over Sun who had taken over MySQL - (2009-04-21)
  [924] The LAMP Cookbook - Linux, Apache, MySQL, PHP / Perl - (2006-11-13)
  [918] Databases needn't be frightening, hard or expensive - (2006-11-08)
  [691] Testing you Perl / PHP / MySQL / Tcl knowledge - (2006-04-19)
  [591] Key facts - SQL and MySQL - (2006-02-04)
  [444] Database or Progamming - which to learn first? - (2005-09-13)
  [382] Central London Courses - Perl, PHP, Python, Tcl, MySQL - (2005-07-18)
  [175] Worthwhile - (2005-01-11)
  [85] Present and future MySQL - (2004-10-12)
  [84] MySQL - nuggets - (2004-10-11)

S152 - SQL Primer as Used in MySQL
  [4007] Which database should I use? MySQL v SQLite - (2013-02-16)
  [3061] Databases - why data is split into separate tables, and how to join them - (2010-11-20)
  [3060] INSERT, DELETE, REPLACE and UPDATE - changing the content of SQL tables - (2010-11-19)
  [2240] How do I query a database (MySQL)? - (2009-06-15)
  [502] SELECT in MySQL - choosing the rows you want - (2005-11-22)
  [494] MySQL - a score of things to remember - (2005-11-12)
  [270] NULL in MySQL - (2005-04-06)
  [158] MySQL - LEFT JOIN and RIGHT JOIN, INNER JOIN and OUTER JOIN - (2004-12-20)

S153 - Sourcing, Running and Configuring MySQL
  [4487] Starting MySQL. ERROR! The server quit without updating PID file - how we fixed it. - (2015-05-06)
  [4406] Fixing damaged MySQL tables - Error 1712 and Error 2013 - (2015-01-25)
  [4390] Checking MySQL database backups have worked (not failed) - (2015-01-10)
  [2458] Cant connect to local MySQL server through socket /tmp/mysql.sock - (2009-10-17)
  [2445] Securing MySQL on a production server - (2009-10-09)
  [2444] Potted MySQL installation - (2009-10-09)
  [2426] Which version of MySQL am I running? - (2009-09-26)
  [2209] Monitoring and Tuning your MySQL installation - (2009-05-31)
  [2085] MySQL - licensing issues, even with using the name - (2009-03-16)
  [1935] Summary of MySQL installation on a Linux system - (2008-12-11)
  [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24)
  [1731] Apache httpd, MySQL, PHP - installation procedure - (2008-08-01)
  [1689] Some sideways thoughts on the news - (2008-06-27)
  [1131] MySQL - Password security (authentication protocol) - (2007-04-02)
  [1123] mysqldump and mysqlrestore - (2007-03-30)
  [1095] Apache httpd , browser, MySQL and MySQL client downloads - (2007-02-28)
  [907] Browser -> httpd -> Tomcat -> MySQL. Restarting. - (2006-10-28)
  [535] MySQL permissions and privileges - (2005-12-20)
  [489] Which MySQL server am I using? - (2005-11-07)
  [334] Symbolic links and hard links - (2005-06-02)
  [192] Current MySQL and PHP paths and upgrades - (2005-01-28)

S154 - MySQL - Designing an SQL Database System
  [4426] FileMaker Day to Unix Time conversion - (2015-02-15)
  [3494] Databases - when to treat the rules as guidelines - (2011-10-23)
  [3361] Blowing our own trumpet - MySQL resources - (2011-07-18)
  [3270] SQL - Data v Metadata, and the various stages of data selection - (2011-04-29)
  [2749] Delegate Question - defining MySQL table relationships as you create the tables - (2010-05-02)
  [2204] Images in a database? How big is a database? (MySQL) - (2009-05-28)
  [2053] What a difference a MySQL Index made - (2009-02-25)
  [1575] Database design for a shopping application (MySQL) - (2008-03-15)
  [1423] MySQL - table design and initial testing example - (2007-11-06)
  [945] Code quality counts - (2006-11-26)
  [375] Oops - I got my initial database design wrong - (2005-07-12)
  [361] Binary Large Objects or bars - (2005-06-27)
  [59] MySQL - Pivot tables - (2004-09-22)

S157 - More MySQL commands
  [4481] Extracting data from backups to restore selected rows from MySQL tables - (2015-05-01)
  [2647] Removing duplicates from a MySQL table - (2010-02-22)
  [2645] Optimising and caching your MySQL enquiries - (2010-02-22)
  [2644] Counting rows in joined MySQL tables - (2010-02-22)
  [2643] Relating tables with joins in MySQL - (2010-02-21)
  [2448] MySQL - efficiency and other topics - (2009-10-10)
  [2110] MySQL - looking for records in one table that do NOT correspond to records in another table - (2009-03-31)
  [1735] Finding words and work boundaries (MySQL, Perl, PHP) - (2008-08-03)
  [1574] Joining MySQL tables revisited - finding nonmatching records, etc - (2008-03-15)
  [1331] MySQL joins revisited - (2007-09-03)
  [1235] Outputting numbers as words - MySQL with Perl or PHP - (2007-06-17)
  [1213] MySQL - the order of clauses and the order of actions - (2007-06-01)
  [673] Helicopter views and tartans - (2006-04-06)
  [567] Combining similar rows from a MySQL database select - (2006-01-17)
  [517] An occasional chance, and reducing data to manageable levels - (2005-12-04)
  [513] MySQL - JOIN or WHERE to link tables correctly? - (2005-12-01)
  [449] Matching in MySQL - (2005-09-24)
  [279] Getting a list of unique values from a MySQL column - (2005-04-14)
  [159] MySQL - Optimising Selects - (2004-12-21)

S159 - MySQL 5 and PHP 5
  [2172] PHP4 v PHP5 - Object Model Difference - (2009-05-11)
  [1766] Diagrams to show you how - Tomcat, Java, PHP - (2008-08-22)
  [1754] Upgrade from PHP 4 to PHP 5 - the TRY issue - (2008-08-15)
  [1455] Connecting to MySQL 5 from PHP on Mac OSX Leopard - (2007-12-03)
  [1417] What software version do we teach? - (2007-10-31)


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