MySQL joins revisited
Archive - Originally posted on "The Horse's Mouth" - 2007-09-03 07:42:35 - Graham EllisSameer 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.