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CASE expressions are very powerful and flexible; however, they sometimes become rather long. That s why Oracle offers several functions that you could interpret as abbreviations (or shorthand notations) for CASE expressions, such as COALESCE and NULLIF (both of these functions are part of the ANSI/ISO SQL standard), NVL, NVL2, and DECODE. We will look at some of these functions in the next chapter. asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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NET Core Barcode is a cross-platform Portable Class Library that generates barcodes using barcode fonts. It supports Windows, macOS and Linux, and can be ... Section 4.6 introduced the IN operator. This section introduces the concept of subqueries by starting with an example of the IN operator. Suppose you want to launch a targeted e-mail campaign, because you have a brand-new course that you want to promote. The target audience for the new course is the developer community, so you want to know who attended one or more build (BLD category) courses in the past. You could execute the following query to get the desired result: select attendee from registrations where course in ('JAV','PLS','XML') This solution has at least two problems. To start with, you have looked at the COURSES table to check which courses belong to the BLD course category, apparently (evidenced by the JAV, PLS, and XML in the WHERE clause). However, the original question was not referring to any specific courses; it referred to BLD courses. 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. and require type conversions, assuming x is a floating point variable and i is an integer In the second case, they look like this: and don t require type conversions. Here are the results: asp.net ean 13 EAN - 13 Barcode Generator for ASP . NET Web Application
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