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20 Dec 2018 ... PDF ( Portable Document Format ) is one of the document file formats that is widely used today and can be opened in all Desktop PC and ... This lookup trick is easy in our demo database, which has a total of only ten courses, but this might be problematic, or even impossible, in real information systems Another problem is that the solution is rather rigid Suppose you want to repeat the e-mail promotion one year later for another new course In that case, you may need to revise the query to reflect the current set of BLD courses A much better solution to this problem is to use a subquery This way, you leave it up to the Oracle DBMS to query the COURSES table, by replacing the list of course codes between the parentheses (JAV, PLS, and XML) with a query that retrieves the desired course codes for you Listing 4-32 shows the subquery for this example Listing 4-32. ms word to pdf converter software free download for windows 10: Download the latest version of Quick Word to PDF free in English on ... free download pdf editing software for windows 7 Free PDF Editor - Download
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