首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
计算机
You are the administrator of a SQL Server 2000 computer. The server contains a database named Inventory. Users report that sever
You are the administrator of a SQL Server 2000 computer. The server contains a database named Inventory. Users report that sever
admin
2009-05-19
23
问题
You are the administrator of a SQL Server 2000 computer. The server contains a database named Inventory. Users report that several storage locations in the UnitsStored field contain negative numbers. You examine the database’s table structure. The table properties are configured as shown in the exhibit.
You correct all the negative numbers in the table. You must prevent the database from storing negative numbers. You also want to minimize use of server resources and physical I/O.
Which transact-SQL statement should you execute?
选项
A、ALTER TABLE dbo.storagelocations ADD CONSTRAINTS
CK_storagelocations_UnitsStored
CHECK (UnitsStored>= 0)
B、CREATE TRIGGER CK_UnitsStored On StorageLocations
FOR INSERT, UPDATE AS
IF INSERTED, UnitsStored < 0 ROLLBACK TRAN
C、CREATE TABLE ck_unitsstored As @Units >= 0
GO
Sp_bindrule ‘OK_UnitsStored’,
‘StorageLocations, UnitsStored’
GO
D、CREATE PROC UpdateUnitsStored
(StorageLocationID int, @UnitsStored bigint)AS
IF @UnitsStored < 0
DATSERROR (50099, 17)
ELSE
UPDATE storaheLocations
SET UnitsStored = @UnitsStored
WHERE StorageLocationID = @storageLocationID
答案
A
解析
Explanation: CHECK constraints are used to enforce domain integrity by restricting the values that are accepted by a column. They determine which values are valid by testing a logical expression that is not based on data in another column. The problem posed by this scenario can be solved through the implementation of such a constraint. In this solution the CHECK constraint is added in line 1 and the CHECK expression is specified in line 3. The expression specifies that the values contained in the UnitsStored column must be more than or equal to 0.
Incorrect Answers:
B: This solution uses a trigger to perform the CHECK constraint, which a trigger can do. However, it is recommended that triggers only be used when the CHECK constraint cannot meet the functionality required by the application. This is thus not the best answer.
C: In this solution creates a new table is created with the CREATE TABLE statement. This is inappropriate to the problem, as it does not address the insertion of negative values in the existing table.
D: This solution creates a stored procedure to perform the CHECK constraint.
转载请注明原文地址:https://jikaoti.com/ti/wwO7FFFM
本试题收录于:
微软70228题库微软认证分类
0
微软70228
微软认证
相关试题推荐
Severaltypesoffinancialriskareencounteredininternationalmarketing;themajorproblemsincludecommercial,political,an
Ofallthegoodsandservicestradedinthemarketeconomy,pharmaceuticalsareperhapsthemostcontentious.Thoughproducedby
Ofallthegoodsandservicestradedinthemarketeconomy,pharmaceuticalsareperhapsthemostcontentious.Thoughproducedby
Imaginativeworkssuchasnovels,plays,films,fairytales,andlegendspresentamoreaccurateandmeaningfulpictureofhuman
[A]"Ijustdon’tknowhowtomotivatethemtodoabetterjob.We’reinabudgetcrunchandIhaveabsolutelynofinancialrewa
BarackObamaspentmuchtimeonthecampaigntrailproposingadramaticvisiontochangenotonlytheUnitedStatesforthebett
In2016,manyshoppersoptedtoavoidthefreneticcrowdsanddotheirholidayshoppingfromthecomfortoftheircomputer.But
MireilleGuiliano,achampagnecompanyexecutive,capturedtheattentionoffrustrateddieterswithherjoyoflifeinthe2005
Adealisadeal—except,apparently,whenEntergyisinvolved.Thecompany,amajorenergysupplierinNewEngland,provokedjus
在用户管理组administrators中添加本地用户“sy”。
随机试题
心室层面相当于
平肝潜阳,清肝明目的药物是疏散风热,清肝明目的药物是
甲在国外旅游,见有人兜售高仿真人民币,用1万元换取10万元假币,将假币夹在书中寄回国内。(事实一题)赵氏调味品公司欲设加盟店,销售具有注册商标的赵氏调味品,派员工赵某物色合作者。甲知道自己不符加盟条件,仍找到赵某送其2万元真币和10万元假币,请其帮忙加盟事
债权合同是指确定、变更、终止()关系的合同。
钢绞线用于预应力混凝土,其极限强度主要有()MPA
安全警示标志设置后的管理工作主要内容包括()。
有权选举和更换非由职工代表担任的董事、监事的机构是( )。
读下面图表完成以下题。造成A、C两地气温差异的主要原因是()。
试述《巴塞尔协议>的目的和主要内容。
A、athleticismB、MoralC、WillpowerD、FreedomB
最新回复
(
0
)