SQL Server 2012 Development Course

Transcription

1 SQL Server 2012 Development Course Exam: 1 Lecturer: Amirreza Keshavarz May 2015

2 1- You are a database developer and you have many years experience in database development. Now you are employed in a company which is named Loxgo. The company uses SQL Server 2012 and all the company data is stored in the SQL Server 2012 database. Sales information for your company orders is stored in this database. According to the company requirement, a common table expression (CTE) has to be implemented. In the options below, which code segment should be used? A. SELECT Year, Region, Total FROM (SELECT Year, Region, SUM(OrderTotal) AS Total FROM Orders GROUP BY Year, Region) AS [SalesByYear]; B. SELECT DISTINCT Year, Region, (SELECT SUM(OrderTotal) C. CREATE VIEW SalesByYear AS SELECT Year, Region, SUM(OrderTotal) FROM Orders GROUP BY Year, Region; GO SELECT Year, Region, Total FROM SalesByYear; D. WITH SalesByYear(Year,Region,Total) FROM Orders SalesByYear AS (SELECT Year, Region, SUM(OrderTotal) SELECT Year, Region, Total FROM SalesByYear; WHERE Orders.Year = SalesByYear.YEAR AND Orders.Region = SalesByYear.Region) AS [Total] FROM Orders; FROM Orders GROUP BY Year,Region) 2- Which of the following functions would you consider using to generate surrogate keys? (Choose all that apply.) A. NEWID B. NEWSEQUENTIALID C. GETDATE D. CURRENT_TIMESTAMP 3- The company uses SQL Server 2012 and all the company data is stored in the SQL server 2012 database. According to the business development, you are developing a new database, which will have two tables named SallsBillItem and Goods contained. They are related to each other. Now you are 1

3 assigned a task to make sure that all goods referenced in the SalesBillItem table have a corresponding record in the goods table. Which method would be used to accomplish this task? A. DDL trigger B. Foreign key constraint C. Primary key D. DML trigger 4- You have two tables respectively named Bills and BillItems BillItems is related to Bills by a foreign key that enables CASCADE DELETE. Now you are asked to have all records removed from the Bills table. Of the Transact-SQL statements below, which one would be used? A. DROP FROM BillItems B. DROP TABLE Bills statement would be used C. DELETE FROM Bills statement D. TRUNCATE TABLE Bills statement E. DELETE FROM BillItems 5- You execute a query with a TOP (3) option. Which of the following options most accurately describes how many rows will be returned? A. Fewer than three rows B. Three rows or fewer C. Three rows D. Three rows or more E. More than three rows F. Fewer than three, three, or more than three rows 6- Your company assigns a task to you that you have to write a query. The query returns the sequential number of a row within a partition of a result set by using a ranking function, the row starts at1 for the first row in each partition. In order to accomplish this task, which Transact-SQL statement should you use? A. RANK B. NTILE(10) C. ROW_NUMBER D. DENSE_RANK 2

4 7- Which of the following OFFSET-FETCH options are valid in T-SQL? (Choose all that apply.) A. SELECT ORDER BY orderid OFFSET 25 ROWS B. SELECT ORDER BY orderid FETCH NEXT 25 ROWS ONLY C. SELECT ORDER BY orderid OFFSET 25 ROWS FETCH NEXT 25 ROWS ONLY D. SELECT <no ORDER BY> OFFSET 0 ROWS FETCH FIRST 25 ROWS ONLY 8- You are writing a query, which returns a list of sales that have grossed more than $10, during the year Meanwhile, the filter expression of SUM ([Order Details].Unit Price * [Order Details].Quantity) > should be inserted into the query. Of the clauses below, which one should be inserted into this expression? A. WHERE B. HAVING C. GROUP BY D. ON E. WHEN 9- There re two columns that are used to store data information by your company. The two columns are respectively named Column1 and Column2. Column1 contains the data in local time, Column2 contains the difference between local time and UTC time. According to the company requirement, this data has to be stored in a single column. As the technical support, you have to accomplish this task. Of the following data types, which one should you choose? A. datetime2 B. datetimeoffset C. time D. datetime2 10- There re two tables in the database. The two tables are respectively named CommoditySort and CommoditySubSort. According to the company requirement, a query should be written. A list of commodity sorts which contain more than ten sub-sorts should be returned by the query. As the technical support, the company assigns this task to you. You have to write this query. In the options below, which query should be used? A. SELECT [Name] FROM Commodity Sort c WHERE EXISTS (SELECT CommoditySortID FROM CommoditySubSort WHERE CommoditySortID= c.commoditysortid GROUP BY CommoditySortID HAVING COUNT (*) > 10) 3

5 B. SELECT [Name] FROM Commodity Sort c WHERE NOT EXISTS (SELECT CommoditySortID FROM CommoditySubSort WHERE CommoditySortID= c.commoditysortid GROUP BY CommoditySortID HAVING COUNT (*) > 10) C. SELECT [Name] FROM CommoditySubSort WHERE CommoditySortIDIN (SELECT CommoditySortID FROM CommoditySort) GROUP BY [Name] HAVING COUNT (*) > 10 D. SELECT [Name] FROM CommoditySubSort WHERE CommoditySortID NOT IN (SELECT CommoditySortID FROM CommoditySort) GROUP BY [Name] HAVING COUNT (*) > You have a table named Client. Now you are assigned a task to make sure that client data in the table not only make the credit limit less than 10,000, but also make the credit limit zero when client identification has not been verified. So which constraint would you check to accomplish this task? A. ((CreditLimt = 0 AND Verified = 0) OR (CreditLimt BETWEEN 1 AND AND Verified = 1)) B. (CreditLimt BETWEEN 1 AND 10000) C. (Verified = 1 AND CreditLimt BETWEEN 1 AND 10000) D. ((CreditLimt = 0 AND Verified = 0) AND (CreditLimt BETWEEN 1 AND AND Verified=1)) E. ((Verified = 1 AND CreditLimt BETWEEN 1 AND 10000) AND (CreditLimt BETWEEN 1 AND AND Verified = 1)) 12- You insert the WorkerID of each Workers manager in the ReportsTo column to document your company s organizational hierarchy. You have to write a recursive query. The query should produce a list of Workers and their manager and include the Workers level in the hierarchy. You write the following code segment. (Line numbers are used for reference only.) 01 WITH WorkerList (WorkerID, FullName, ManagerName, Level) 02 AS ( ) 05 SELECT WorkerID, FullName, ManagerName, Level 06 FROM WorkerList; At line 3, which code segment should you insert? 4

6 A. SELECT WorkerID, FullName, AS [ReportsTo], 1 AS [Level] FROM Worker WHERE ReportsTo IS NULL UNION ALL SELECT emp.workerid, emp.fullnname mgr.fullname, 1+ 1 AS [Level] FROM Worker emp JOIN Worker mgr ON emp.reportsto = mgr.workerid B. SELECT WorkerID, FullName, AS [ReportsTo], 1 AS [Level] FROM Worker WHERE ReportsTo IS NULL UNION ALL SELECT emp.workerid, emp.fullname, mgr.fullname, mgr. Level + 1 FROM WorkerList mgr JOIN Worker emp ON emp.reportsto = mgr.workerid C. SELECT WorkerID, FullName, AS [Reports To], 1 AS [Level] FROM Worker UNION ALL SELECT emp.workerid, emp.fullname, mgr.fullname, AS [Level] FROM Worker emp LEFT JOIN Worker mgr ON emp.reportsto = mgr.workerid D. SELECT WorkerID, FullName, AS [ReportsTo], 1 AS [Level] FROM Worker UNION ALL SELECT emp.workerid, emp.fullname, mgr.fullname, mgr.level + 1 FROM WorkerList mgr JOIN Worker emp ON emp.reportsto = mgr.workerid 13-Why is it important to use the appropriate type for attributes? A. Because the type of your attribute enables you to control the formatting of the values. B. Because the type constrains the values to a certain domain of supported values C. Because the type prevents duplicates D. Because the type prevents NULLs 14- When a query doesn t have an ORDER BY clause, what is the order in which the rows are returned? A. Arbitrary order B. Primary key order C. Clustered index order D. Insertion order 5

7 15- You have a table named Staff. In order to identify the supervisor that each staff reports to, you write the following query: SELECT e.staffname AS [StaffName], s.staffname AS [SuperVisorName] FROM Staff e Now you are asked to make sure that a list of all staff and their respective supervisor is returned by the query. So of the following join clauses, which one would be used to complete the query? A. LEFT JOIN Staff s ON e.staffid = s.staffid B. INNER JOIN Staff s ON e.reportsto = s.staffid C. LEFT JOIN Staff s ON e.reportsto = s.staffid D. RIGHT JOIN Staff s ON e.reportsto = s.staffid E. INNER JOIN Staff s ON e.staffid = s.staffid 16- You have a table named Sales. You are tasked to list products that have been sold to less than ten customers. You need to write a query to achieve the task. Which Transact-SQL statement should you use? A. SELECT ProductID,COUNT(*) AS CustomerCount FROM Sales GROUP BY ProductID, CustomerID HAVING COUNT(*) < 10; B. SELECT ProductID,COUNT(DISTINCT CustomerID) AS CustomerCount FROM Sales GROUP BY ProductID HAVING COUNT(DISTINCT CustomerID) < 10; C. SELECT ProductID, CustomerID,COUNT(DISTINCT CustomerID) AS CustomerCount FROM Sales GROUP BY ProductID, CustomerID HAVING COUNT(DISTINCT CustomerID) < 10; D. SELECT * FROM (SELECT ProductID, RANK() OVER (ORDER BY CustomerID DESC) AS Rnk FROM Sales) s WHERE s.rnk <= 10; 17 -What is the difference between the ON clause and the WHERE clause? A. the ON clause uses two-valued logic and the WHERE clause uses three-valued logic. B. the ON clause uses three-valued logic and the WHERE clause uses two-valued logic. C. In outer joins, the ON clause determines filtering and the WHERE clause determines matching. 6

8 D. In outer joins, the ON clause determines matching and the WHERE clause determines filtering. 18- What is the restriction that grouped queries impose on your expressions? A. If the query is a grouped query, you must invoke an aggregate function. B. If the query has an aggregate function, it must have a GROUP BY clause. C. The elements in the GROUP BY clause must also be specified in the SELECT clause. D. If you refer to an element from the queried tables in the HAVING, SELECT, or ORDER BY clauses, it must either appear in the GROUP BY list or be contained by an aggregate function. 19- What is the difference between the COUNT(*) aggregate function and the `COUNT(<expression>) general set function? A. COUNT(*) counts rows; COUNT(<expression>) counts rows where <expression> is not NULL. B. COUNT(*) counts columns; COUNT(<expression>) counts rows. C. COUNT(*) returns a BIGINT; COUNT(<expression>) returns an INT. D. There s no difference between the functions. 20- You have a table named Sales.PotentialClients. This table contains a column named Address.You are tasked to develop a report that returns valid ".com" addresses from Sales.PotentialClients. A valid address must have at least one character before sign, and one character after sign and before the ".com." You need to write a Transact-SQL statement that returns data to meet the business requirements. Which Transact-SQL statement should you use? A. select * from Sales.PotentialClients where Address like '_%@_%.com' B. select * from Sales.PotentialClients where Address like '%@%.com' C. select * from Sales.PotentialClients where Address like '_%@_.com' D. select * from Sales.PotentialClients where Address like '%@%[.]com' 21-You have a table named Sales.SalesOrderHeader and a table named Person.Person. You are tasked to write a query that returns SalesOrderID and SalesPersonName that have an OrderDate greater than SalesPersonName should be made up by concatenating the columns named FirstName and LastName from the table named Person.Person. You need to write a query to return data, sorted in alphabetical order, by the concatenation of FirstName and LastName. Which Transact-SQL statement should you use? 7

9 A. SELECT SalesOrderID, FirstName + + LastName as SalesPersonName FROM Sales.SalesOrderHeader H JOIN Person.Person P on BusinessEntityID = H.SalesPersonID WHERE OrderDate > ORDER BY FirstName ASC, LastName ASC B. SELECT SalesOrderID, FirstName + + LastName as SalesPersonName FROM Sales.SalesOrderHeader H JOIN Person.Person P on BusinessEntityID = H.SalesPersonID WHERE OrderDate > ORDER BY FirstName DESC, LastName DESC C. SELECT SalesOrderID, FirstName + + LastName as SalesPersonName FROM Sales.SalesOrderHeader H JOIN Person.Person P on BusinessEntityID = H.SalesPersonID WHERE OrderDate > ORDER BY SalesPersonName ASC D. SELECT SalesOrderID, FirstName + + LastName as SalesPersonName FROM Sales.SalesOrderHeader H JOIN Person.Person P on BusinessEntityID = H.SalesPersonID WHERE OrderDate > ORDER BY SalesPersonName DESC 22- Which of the following correctly represents the logical query processing order of the various query clauses? A. SELECT > FROM > WHERE > GROUP BY > HAVING > ORDER BY B. FROM > WHERE > GROUP BY > HAVING > SELECT > ORDER BY C. FROM > WHERE > GROUP BY > HAVING > ORDER BY > SELECT D. SELECT > ORDER BY > FROM > WHERE > GROUP BY > HAVING 8