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单选题
You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）
A
ALTER TABLE commercials MODIFY (description CHAR2(2000));
B
ALTER TABLE commercials CHANGE (description CHAR2(2000));
C
ALTER TABLE commercials CHANGE (description VARCHAR2(2000));
D
ALTER TABLE commercials MODIFY (description VARCHAR2(2000));
E
You cannot increase the size of a column if the table has rows.
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更多 “单选题You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）A ALTER TABLE commercials MODIFY (description CHAR2(2000));B ALTER TABLE commercials CHANGE (description CHAR2(2000));C ALTER TABLE commercials CHANGE (description VARCHAR2(2000));D ALTER TABLE commercials MODIFY (description VARCHAR2(2000));E You cannot increase the size of a column if the table has rows.” 相关考题
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资料：Changing careers is becoming more popular. Not just because there are more career options available, but also out of necessity. As new industries arise, others die. It's up to you to figure out if your career is still going to be around in the next 5-10 years. Some studies say we could have as many as nine careers in our professional lifetime. Which begs the question: do you know what it takes to successfully change career lanes repeatedly?
Switching careers is like changing highway lanes: you must signal!
If you want to move in a new career direction, you need to signal to the professional world you intend to make a change. You need to do it with purpose and specificity. It must look well-thought out and intentional. Otherwise, people will A） not know you are looking to make the change, and B）assume you are doing it because you failed in your current career in some way.
1. Give the logic and passion behind your career change.
When signaling to your network you want to switch careers you must explain why both your head and heart are ready to change. Perhaps there are financial or geographic reasons （i.e., you need to relocate or make more money）. But, you must also convey the excitement and sincere desire you have for this new career （i.e., you want to make a difference or work on a particular type of problem that needs to be solved）.
2. Build a marketing campaign for your business-of-one.
Most employers prefer to hire people with previous experience. Thus, you're going to need a way to convey to them your transferable skills from your former career path will be equally valuable. The best way to do this is to create a targeted list of employers you want to work for and then strategically network with their employees. The more conversations and connections you can have within your new career path, the easier it will be to convince someone to hire you in spite of your lack of experience.
To sum it up … Once you commit to a career change, the secret to success is to make sure everyone knows about it. Otherwise, you will struggle to change career lanes efficiently and effectively.
What does the sentence “you must signal!” mean in paragraph 2?A.You need to have more conversations and connections within your new career path.
B.You need to build a marketing campaign for your business-of-one.
C.You need to give the logic and passion behind your career change.
D.You need to make sure everyone knows about it.
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You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform?（）A、MERGEB、INSERTC、UPDATED、ADDE、ENTERF、You cannot enter the phone numbers for the existing employee records.
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AB
BC
CD
D
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The block change tracking feature is used automatically by RMAN.C
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单选题You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform?（）A
MERGEB
INSERTC
UPDATED
ADDE
ENTERF
You cannot enter the phone numbers for the existing employee records.
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单选题You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）A
ALTER TABLE commercials MODIFY (description CHAR2(2000));B
ALTER TABLE commercials CHANGE (description CHAR2(2000));C
ALTER TABLE commercials CHANGE (description VARCHAR2 (2000));D
ALTER TABLE commercials MODIFY (description VARCHAR2 (2000));E
You cannot increase the size of a column if the table has rows.
考题
单选题You are using Oracle Database 10g. Which statement regarding an incomplete recovery is true？（）A
You do not need to restore all the data files.B
You do not need to open the database with the RESETLOGS operationC
You do not need to perform a full backup after the RESETLOGS operation.D
You do not need to recover all the data files to the same system change number （SCN）.
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单选题You have an existing Windows Communication Foundation (WCF) service that exposes a service contract over HTTP. You need to expose that contract over HTTP and TCP. What should you do?（）A
Add a net.tcp base address to the host.B
Add an endpoint configured with a netTcpBinding.C
Add an endpoint behavior named netTcpBehavior to the existing endpoint.D
Add a binding configuration to the existing endpoint named netTcpBinding.
考题
单选题You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform?（）A
MERGEB
INSERTC
UPDATED
ADDE
ENTERF
You cannot enter the phone numbers for the existing employee records.
考题
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Install a TV tuner card that supports high-definition TV （HDTV）.B
Install an additional TV tuner card.C
Contact your TV cable or satellite provider to add support for concurrent recording.D
Remove the existing TV tuner card. Install a new TV tuner card that supports MPEG-2 video hardware or software video decoding.
考题
单选题You need to create a class definition that is interoperable along with COM.You need to ensure that COM applications can create instances of the class and can call the GetAddress method. Which code segment should you use？（）A
AB
BC
CD
D
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