By Tobias Thernstrom
Эта книга поможет Вам глубже понять принципы работы с базами данных в Microsoft SQL Server 2008, а также подготовиться к экзамену 70-433 (MCTS).
About The BookYour 2-in-1 SELF-PACED education package good points authentic examination prep and perform for examination 70-433
# Ace your training for the talents measured through MCTS examination 70-433—and at the activity. paintings at your personal speed via a chain of classes and experiences that totally hide each one examination target. Then, strengthen and follow what you’ve realized via real-world case situations and perform workouts. This professional Microsoft learn advisor is designed that will help you utilize your learn time. Maximize your functionality at the examination by means of studying to: Create and deal with database objects
# question and regulate facts; enforce subqueries and CTEs
# Optimize desk buildings and information integrity
# Create kept approaches, features, and triggers
# deal with transactions, mistakes dealing with, and alter tracking
# track question performance
# enforce database mail, full-text seek, provider dealer, scripts
# paintings with XML and SQLCLR examine your abilities with the perform assessments on CD. you could paintings via 1000s of questions utilizing a number of checking out modes to fulfill your particular studying wishes. You get particular reasons for correct and unsuitable answers—including a personalised studying direction that describes how and the place to concentration your experiences. Your package includes:
# 15% examination from Microsoft. supply expires 12/31/13. info inside.
# reputable self-paced research guide.
# perform exams with a number of, customizable checking out strategies and a studying plan in keeping with your results.
# two hundred perform and evaluation questions.
# 180-day trial of SQL Server 2008 firm Edition.
# Case situations, workouts, and most sensible practices.
# totally searchable booklet of this advisor, plus pattern chapters from comparable books.
Read Online or Download Self-Paced Training Kit (Exam 70-433): Microsoft SQL Server 2008-Database Development PDF
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Extra info for Self-Paced Training Kit (Exam 70-433): Microsoft SQL Server 2008-Database Development
Open a new query window. 2. In the existing query window, type and execute the following command to display the product ID and name for all active products that have not had any sales. Products with a list price of $0 are not included because they are not currently available for sale. ProductID ORDER BY ProductID; 3. ProductID ORDER BY ProductID; 4. Because of the data integrity checks in this database, the SELECT command in step 3 returns the same result set as a SELECT DISTINCT command run against the SalesOrderDetail table because every product that is sold is included in the Product table.
N Group aggregate data by using the GROUP BY statement. Estimated lesson time: 45 minutes Working with Aggregate Functions Aggregate functions perform calculations on a set of data and return a scalar (single) value. The following aggregate functions are available in SQL Server 2008: n AVG Returns the average of all values in the data set. n CHECKSUM_AGG Returns the checksum of all values in the data set. n COUNT Returns the number of values contained in the data set. COUNT(*) returns the number of rows in the set.
Save the script and close the query window, but leave SSMS open for the next practice. Lesson Summary n Aggregate functions perform calculations on expressions that are provided as input to the function. n Use the GROUP BY clause when aggregates should be applied based on the data in specific rows rather than the entire table. n Include all columns listed in a SELECT, WHERE, or ORDER BY clause in the GROUP BY clause. n Use ROLLUP and CUBE to provide additional summary information. n Use the GROUPING function to show which rows hold summary data provided by the ROLLUP or CUBE operators.