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12. How could you redesign the EMPLOYEES table to avoid the problem that the COMM column contains null values meaning not applicable Answer: By dropping that column from the EMPLOYEES table and by creating a separate SALESREPS table, with the following rows: EMPNO COMM -------- -------7499 300 7521 500 7654 1400 7844 0 In this table, the EMPNO column is not only the primary key, but it is also a foreign key referring to the EMPLOYEES table. 13. In Section 4.9, you saw the following statement: In SQL, NOT is not not. What is this statement trying to say Answer: In three-valued logic, the NOT operator is not the complement operator anymore: NOT TRUE is equivalent with FALSE not TRUE is equivalent with FALSE OR UNKNOWN 14. Referring to the brain-twister at the end of Section 4.9, what is the explanation of the result no rows selected in Listing 4-44 asp.net upc-a UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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6 Apr 2005 ... Demonstrates a method to draw UPC-A barcodes using C#. ... NET 2003 - 7.87 Kb. Image 1 for Drawing UPC-A Barcodes with C# ... One challenging situation in which some programmers would use a goto is the case in which you have two conditional tests and an else clause and want to execute code in one of the conditions and in the else clause. Here s an example of a case that could drive someone to goto: asp.net upc-a Barcode UPC-A - CodeProject
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NET UPC-A Generator Controls to generate GS1 UPC-A barcodes in VB. NET , C# applications. Download Free Trial Package | Developer Guide included ... Which Graphics Do I Add to Each Slide De ning Your Design Constraints Adding Graphics Using Three Ground Rules Rule 1: See It in Seconds Rule 2: Align the Aesthetics with the Audience Rule 3: Defend Your Foundation! Starting the Production Flow Assigning What You Can Getting the Graphics You Already Have Getting the Graphics You Can Easily Find Creating the Graphics You Can Applying Custom Layouts to Your Storyboard Creating Layouts Manually Applying, Reviewing, and Re ning the Layouts Adding Graphics to the Call to Action and Key Point Slides Duplicating and Positioning Key Point Slides 1 and 2 Creating the Act III Slides Preparing Slides That Don t Require Graphics Adding Graphics to the Act I Slides if ( statusOk ) { if ( dataAvailable ) { importantVariable = x; goto MID_LOOP; } } else { importantVariable = GetValue(); MID_LOOP: // lots of code ... } Answer: The following WHERE clause: 2 where evaluation not in (1,2,3,NULL) asp.net upc-a UPC-A Barcode Generator for ASP . NET Web Application
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The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the ... ASP . NET /Windows Forms/Reporting Services/Compact Framework ... This is a good example because it s logically tortuous it s nearly impossible to read as it stands, and it s hard to rewrite correctly without a goto. If you think you can easily rewrite it without gotos, ask someone to review your code! Several expert programmers have rewritten it incorrectly. You can rewrite the code in several ways. You can duplicate code, put the common code into a routine and call it from two places, or retest the conditions. In most languages, the rewrite will be a tiny bit larger and slower than the original, but it will be extremely close. Unless the code is in a really hot loop, rewrite it without thinking about efficiency. 227 228 230 230 233 237 240 240 241 241 242 243 245 256 257 259 260 261 262 The best rewrite would be to put the // lots of code part into its own routine. Then you can call the routine from the places you would otherwise have used as origins or destinations of gotos and preserve the original structure of the conditional. Here s how it looks: is logically equivalent with the following iterated AND condition: 2 3 4 5 where AND AND AND evaluation evaluation evaluation evaluation <> <> <> <> 1 2 3 NULL if ( statusOk ) { if ( dataAvailable ) { importantVariable = x; DoLotsOfCode( importantVariable ); } } else { importantVariable = GetValue(); DoLotsOfCode( importantVariable ); } Normally, writing a new routine is the best approach. Sometimes, however, it s not practical to put duplicated code into its own routine. In this case you can work around the impractical solution by restructuring the conditional so that you keep the code in the same routine rather than putting it into a new routine. Here s how it looks: Adding Graphics to the Explanation Slides Fine-Tuning and Finishing Up Adding Graphics to the Title and Closing Credits Slides Reviewing and Adding Graphics to the Notes Pages Reviewing and Finalizing the Storyboard 10 Tips for Enhancing Your Storyboard if ( ( statusOk && dataAvailable ) || !statusOk ) { if ( statusOk && dataAvailable ) { importantVariable = x; } else { importantVariable = GetValue(); } // lots of code ... }
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