Oracle, APEX, Java, J2EE

If you need to understand SQL Joins then following is the good article. http://www.oracle-base.com/articles/9i/ANSIISOSQLSupport.php

It is quite possible you could work with Oracle databases for many years and never come across the ALL , ANY and SOME comparison conditions in SQL because there are alternatives to them that are used more regularly. You can find more info on following links: PL/SQL Challenge Oracle-Base Article Oracle Documentation I hope this will be quite useful to many developers. Thanks to PL/SQL Challenge. Regards, Sohil Bhavsar

Hi friends, How to calculate difference between columns of current and previous/next row? Let's say, you want to monitor how often products are sold from your store. i.e.  You want difference between current and previous SELL_DATE then you can write query as follows: SELECT TO_CHAR(SELL_DATE, 'DD-MON-YYYY HH24:MI:SS'), TO_CHAR(LAG(SELL_DATE) OVER (ORDER BY SELL_DATE), 'DD-MON-YYYY HH24:MI:SS') AS SELL_DATE_PREV, (SELL_DATE - LAG(SELL_DATE) OVER (ORDER BY SELL_DATE)) * 24 * 60 * 60 AS DIFF_IN_SECONDS FROM PRODUCT_SALES ORDER BY SELL_DATE DESC; More Info: Oracle - Base : Lag Lead Analytic Functions Regards, Sohil Bhavsar

Oracle Application Express 4.0 with ExtJS Oracle Application Express 4.0 with ExtJS is quite interesting book. I feel it will be very helpful to the APEX community. Because, there are very limited resources available for integration of ExtJS and Oracle APEX and the way the book is written it is very easy to understand the concepts of ExtJS. APEX team has already integrated jQuery in Oracle APEX 4.0 onwards, so before reading the book I had a mindset that jQuery is better then ExtJS but now I feel for Rich User Experience ExtJs is quite good option and APEX Developmt Team should focus towards that. Congratulations Mark Lancaster for publishing this book.