4: Lesson Review Answers in .NET framework

Maker PDF 417 in .NET framework 4: Lesson Review Answers

4: Lesson Review Answers
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PDF417 Scanner In .NET
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Lesson 1
Barcode Creator In .NET Framework
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1. Correct Answers: B and C A. Incorrect: An index has a single page at the root level that is called the root page. B. Correct: An intermediate level can contain zero or more pages, and an index can have multiple intermediate levels. C. Correct: The leaf level can contain one or more pages; there is only a single leaf level, which is at the bottom of the index. D. Incorrect: B-tree is the name for the structure of the index, not a level in the structure.
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4: Lesson Review Answers
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Lesson 2
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1. Correct Answer: B A. Incorrect: A unique index requires that the data value in each row for the index is not duplicated, but it does not affect the physical ordering of the table. B. Correct: A clustered index causes the rows in the table to be physically ordered based on the index definition. C. Incorrect: A nonclustered index does not enforce a physical structure. D. Incorrect: A foreign key enforces referential integrity between two tables. 2. Correct Answer: B A. Incorrect: PAD_INDEX leaves empty space on intermediate-level pages in the index. B. Correct: FILLFACTOR leaves empty space on the leaf level of an index. C. Incorrect: MAXDOP specifies the maximum degree of parallelism used during index creation. D. Incorrect: IGNORE_DUP_KEY causes duplicates to be ignored for unique indexes.
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Lesson 3
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1. Correct Answer: A A. Correct: PAD_INDEX leaves empty space on intermediate-level pages in the index. B. Incorrect: FILLFACTOR leaves empty space on the leaf level of an index. C. Incorrect: MAXDOP specifies the maximum degree of parallelism used during index creation. D. Incorrect: IGNORE_DUP_KEY causes duplicates to be ignored for unique indexes.
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4: Case Scenario Answers
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4: Case Scenario Answers
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Case Scenario: Indexing a Database
1. The first step is to verify that each table in the database has a primary key to ensure that rows can be uniquely identified. You implement the primary keys as indexes, and they should be sufficient to satisfy the requirements of data entry. 2. After verifying that primary keys exist on all the tables, you ensure that each table has a clustered index. To simplify things at this point, until you have much more knowledge about the data-access patterns and the volume and pattern of changes, you decide to alter all the primary keys so that they are clustered indexes as well. 3. You then create additional nonclustered indexes that SQL Server can use to quickly satisfy the search criteria that employees are using to locate claims data. The initial stage of this process is to simply get nonclustered indexes in place for use with the most common queries. 4. In a secondary indexing round, you will take a closer look at the nonclustered indexes to determine whether columns can be included to make the indexes covering indexes for the most common queries.
5: Lesson Review Answers
Lesson 1
1. Correct Answers: A, C, and D A. Correct: A full outer join returns nonmatching data from both the left and right tables. B. Incorrect: An inner join returns only matching data. C. Correct: A right outer join returns nonmatching data from the right table. D. Correct: A left outer join returns nonmatching data from the left table. 2. Correct Answer: D A. Incorrect: AVG returns the average value of the rows. B. Incorrect: COUNT_BIG returns the count of rows as a big integer. C. Incorrect: STDEV returns the standard deviation of the rows. D. Correct: COUNT returns the count of rows as an integer.
5: Lesson Review Answers
3. Correct Answer: D A. Incorrect: This syntax would return only matches for Book . B. Incorrect: This syntax would return matches for Book* (exact string). C. Incorrect: This syntax would return only matches for Book . D. Correct: This syntax would return all words starting with Book .
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