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NEW QUESTION 37
Which three actions can you perform on an existing table containing data? (Choose three.)

• A. Increase the width of a numeric column
• B. Change a DATEcolumn containing data to a NUMBERdata type
• C. Change the default value of a column
• D. Define a default value that is automatically inserted into a column containing nulls
• E. Add a new NOT NULL column with a DEFAULTvalue
• F. Add a new column as the table's first column

Answer: A,C,E

Explanation:
Explanation/Reference: https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj24513.html

NEW QUESTION 38
Which statement is true about transactions?

• A. A combination of DDL and DML statements executed in a sequence ending with a COMMITforms a single transaction.
• B. A set of DDL statements executed in a sequence ending with a COMMITforms a single transaction.
• C. A set of Data Manipulation Language (DML) statements executed in a sequence ending with a SAVEPOINTforms a single transaction.
• D. Each Data Definition Language (DDL) statement executed forms a single transaction.

Answer: D

Explanation:
Explanation/Reference:
References:
https://docs.oracle.com/database/121/CNCPT/transact.htm#CNCPT038

NEW QUESTION 39
View the Exhibit and examine the structure of the CUSTOMERS and CUST_HISTORY tables.

The CUSTOMERS table contains the current location of all currently active customers.
The CUST_HISTORY table stores historical details relating to any changes in the location of all current as well as previous customers who are no longer active with the company.
You need to find those customers who have never changed their address.
Which SET operator would you use to get the required output?

• A. UNION ALL
• B. MINUS
• C. UNION
• D. INTERSECT

Answer: B

NEW QUESTION 40
Evaluate these commands which execute successfully:

Which two statements are true about the ORD_ITEMStable and the ORD_SEQsequence?

• A. Sequence ORD_SEQis guaranteed not to generate duplicate numbers.
• B. If sequence ORD_SEQis dropped then the default value for column ORD_NOwill be NULL for rows inserted into ORD_ITEMS.
• C. Column ORD_NOgets the next number from sequence ORD_SEQwhenever a row is inserted into ORD_ITEMSand no explicit value is given for ORD_NO.
• D. Sequence ORD_SEQcycles back to 1 after every 5000 numbers and can cycle 20 times.
• E. Any user inserting rows into table ORD_ITEMSmust have been granted access to sequence ORD_SEQ.

Answer: A,E

NEW QUESTION 41
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