ALTER TABLE commercials MODIFY (description CHAR2(2000));
ALTER TABLE commercials CHANGE (description CHAR2(2000));
ALTER TABLE commercials CHANGE (description VARCHAR2(2000));
ALTER TABLE commercials MODIFY (description VARCHAR2(2000));
You cannot increase the size of a column if the table has rows.
第1题:
You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation.What should you do?()
A.A
B.B
C.C
D.D
第2题:
第3题:
A.
B.
C.
D.
第4题:
You are running Linux 2.0.36 and you need to add a USB mouse to your system. Which of the following statements is true?()
第5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 1000 bytes. The column can currently hold 500 bytes per value. The table contains 20000 rows. Which statement is valid?()
第6题:
You run Windows Defender on your computer and receive the following warning message: "Windows Defender Definitions haven’t been updated."You need to ensure that Windows Defender definition files are updated.What should you do?()
A.A
B.B
C.C
D.D
第7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?()
第8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. MERGE
B. INSERT
C. UPDATE
D. ADD
E. ENTER
F. You cannot enter the phone numbers for the existing employee records.
第9题:
You are designing a plan to migrate an existing application to Windows Azure. The application currently resides on a server that has 768 MB of memory and multiple cores. You need to recommend the smallest compute instance size that is equivalent to the existing server. Which size should you recommend?()
第10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?()