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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
MySQL joins revisited

Sameer writes:

"Nobody can clear JOINS as this manual has done. It is SUPERB.. Thanks. It helped me a lot to understand. I will appreciate if you can make much clear to the INNER AND SELF JOINS."

in his review of a previous "Horse's Mouth" posting I made [here], which gets hundreds of hits every day, mainly search engine arrivals, and a sprinkling of "wow - that page was great" responses with no - as yet - contrary negatives. It's fantastic to get such feedback from time to time and it's all the more special when I think about just how many web pages I visit, and how very rarely I write to the page provider to compliment him.

We provide MySQL training. So, naturally, I should be able to explain things like the different join types very well, shouldn't I? Yes and no - the printed explanation as you see in books and on websites is often different to the more interactive demonstration which we do in class ... that can be even more effective!




Sameer goes on to ask for more information on other subjects such as self joins. With around 8000 pages on our site, there are plenty of answers here but we haven't yet got an indexing and search system that's as effective as we would like. So, Sameer, can I point you to:
• Our forum archive for an answer on SELF JOIN
• A previous blog entry for our MySQL IAQ (infrequently answered questions) page.
(written 2007-09-03)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
S157 - More MySQL commands
  [158] MySQL - LEFT JOIN and RIGHT JOIN, INNER JOIN and OUTER JOIN - (2004-12-20)
  [159] MySQL - Optimising Selects - (2004-12-21)
  [279] Getting a list of unique values from a MySQL column - (2005-04-14)
  [449] Matching in MySQL - (2005-09-24)
  [494] MySQL - a score of things to remember - (2005-11-12)
  [502] SELECT in MySQL - choosing the rows you want - (2005-11-22)
  [513] MySQL - JOIN or WHERE to link tables correctly? - (2005-12-01)
  [515] MySQL - an FAQ - (2005-12-03)
  [517] An occasional chance, and reducing data to manageable levels - (2005-12-04)
  [567] Combining similar rows from a MySQL database select - (2006-01-17)
  [572] Giving the researcher power over database analysis - (2006-01-22)
  [581] Saving a MySQL query results to your local disc for Excel - (2006-01-29)
  [591] Key facts - SQL and MySQL - (2006-02-04)
  [673] Helicopter views and tartans - (2006-04-06)
  [1213] MySQL - the order of clauses and the order of actions - (2007-06-01)
  [1235] Outputting numbers as words - MySQL with Perl or PHP - (2007-06-17)
  [1574] Joining MySQL tables revisited - finding nonmatching records, etc - (2008-03-15)
  [1735] Finding words and work boundaries (MySQL, Perl, PHP) - (2008-08-03)
  [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23)
  [2110] MySQL - looking for records in one table that do NOT correspond to records in another table - (2009-03-31)
  [2259] Grouping rows for a summary report - MySQL and PHP - (2009-06-27)
  [2448] MySQL - efficiency and other topics - (2009-10-10)
  [2643] Relating tables with joins in MySQL - (2010-02-21)
  [2644] Counting rows in joined MySQL tables - (2010-02-22)
  [2645] Optimising and caching your MySQL enquiries - (2010-02-22)
  [2647] Removing duplicates from a MySQL table - (2010-02-22)
  [3061] Databases - why data is split into separate tables, and how to join them - (2010-11-20)
  [3270] SQL - Data v Metadata, and the various stages of data selection - (2011-04-29)
  [4481] Extracting data from backups to restore selected rows from MySQL tables - (2015-05-01)


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While waiting for Melksham Post Office
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Melksham Hotel - Five Star Kitchen!
Some other Articles
Expanding a grid - Tcl/Tk
Stable sorting - Tcl, Perl and others
Kasteel Elsloo - Michelin rated hotel.
Melksham Hotel - Five Star Kitchen!
MySQL joins revisited
While waiting for Melksham Post Office
Subway Restaurant in Melksham, Wiltshire
Oliver says ....
Tktable - Laying out data in a matrix - Tcl/Tk
GUI design - Sketch it out first! (Java / Swing example)
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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