题目内容
（请给出正确答案）
在Oracle中，用ALTER将scott的口令改为hello，下列哪个是正确的？（）
A.ALTER USER scott IDENTIFIED BY hello
B.ALTER scott USER IDENTIFIED BY hello
C.ALTER USER scott IDENTIFIED AS hello
D.ALTER USER hello IDENTIFIED BY scott
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更多“在Oracle中，用ALTER将scott的口令改为hell…”相关的问题
A.UPDATE TABLE food RENAME TO fruit
B.UPDATE TABLE fruit RENAME TO food
C.ALTER TABLE fruit RENAME TO food
D.ALTER TABLE food RENAME TO fruit
在Oracle产品中，用公用网关接口实现的过程化网关是
A．Oracle WebListener
B．Oracle WebAgent
C．Oracle WebServer
D．Oracle DBA
A.如果用Oracle和MySQL，需要考虑Oracle的云存储
B.如果用Teradata，需要考虑AWS云存储
C.逻辑模型与技术实现无关，不应该也无需考虑如何存储数据
D.数据可以存储在Hadoop HDFS中，也可以存储在区块链分类账中
A.alter
B.set
C.varchar(50)
D.varchar50
虽然我们在本章中建立的凯恩斯交叉图假设税收是一个固定量，但在许多国家(包括美国)税收取决于收入。我们用下式写出税收收入，以代表税制：
和t为税收的参数；参数t为边际税率：如果收入增加1美元，税收增加t×1美元。
a．这种税制如何改变消费对GDP变动做出反应的方式？
b．在凯恩斯交叉图中。这种税制如何改变政府购买乘数？
c．在IS-LM模型中，这种税制如何改变IS曲线的斜率？
Although our development of the Keynesian cross in this chapter assumes that taxes are a fixed amount, in many countries (including the United States) taxes depend on income. Let's represent the tax system by writing tax revenue as where and t are parameters of the tax code. The parameter t is the marginal tax rate: if income rises by $1, taxes rise by t×$1.
a．How does this tax system change the way consumption responds to changes in GDP？
b．In the Keynesian cross, how does this tax system alter the government-purchases multiplier？
c．In the IS-LM model, how does this tax system alter the slope of the IS curve？
