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Oracle Database SQL Sample Questions (Q288-Q293):

NEW QUESTION # 288
Examine this description of the PRODUCTS table:

You successfully execute this command:

Which two statements execute without errors?

A. Option D
B. Option B
C. Option A
D. Option C

Answer: B

NEW QUESTION # 289
Examine these statements:
CREATE TABLE alter_test (c1 VARCHAR2(10), c2 NUMBER(10));
INSERT INTO alter_test VALUES ('123' 123);
COMMIT;
Which is true ahout modifyIng the columns in AITER_TEST?

A. c2 can be changed to NUMBER(5) but c1 cannot be changed to VARCHAN2 (5).
B. c1 can be changed to NUMBER(10) and c2 can be changed to VARCHAN2 (10).
C. c2 can be changed to VARCHAR2(10) but c1 cannot be changed to NUMBER (10).
D. c1 can be changed to VARCHAR2(5) and c2 can be changed to NUMBER (12,2).
E. c1 can be changed to NUMBER(10) but c2 cannot be changed to VARCHAN2 (10).

Answer: D

Explanation:
In Oracle SQL, the ALTER TABLE statement is used to modify the definition of a table after it has been created. Specific changes are allowed depending on the current data type of the column and the data it contains.
A). You cannot change a VARCHAR2 column to NUMBER if the table contains rows with non-numeric values, which is the case with '123' as a VARCHAR2; it is a string, not a number.
B). You can reduce the size of a NUMBER column if the data will still fit within the new precision, but you cannot change a VARCHAR2 column to a smaller size if it contains values that exceed the new size limit.
C). You cannot change a NUMBER column to VARCHAR2 if the table contains rows because the existing data type of NUMBER does not match the new data type of VARCHAR2.
D). Similar to A, you cannot change the data type from VARCHAR2 to NUMBER if non-numeric data is present.
E). You can change a VARCHAR2(10) column to VARCHAR2(5) if all existing rows have values that fit within the new size, and you can change a NUMBER column to have a different scale (NUMBER(12,2)).
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"

NEW QUESTION # 290
Examine the command:

What does ON DELETE CASCADE Imply?

A. When a row in the books table is deleted, the rows in the BOOK__TRANSACTIONS table whose BOOK_ID matches that of the deleted row in the books table are also deleted.
B. When a value in the BOOKS.BOOK_ID column is deleted, the corresponding value is updated in the books transactions. BOOK_ID column.
C. When the books table is dropped, the BOOK_TRANSACTIONS table is dropped.
D. When the books table is dropped, all the rows in the BOOK_TRANSACTIONS table are deleted but the table structure is retained.

Answer: A

NEW QUESTION # 291
Examine this SQL statement:

Which two are true?

A. The subquery is not a correlated subquery.
B. The UPDATE statement executes successfully even if the subquery selects multiple rows.
C. All existing rows in the ORDERS table are updated.
D. The subquery is executed before the UPDATE statement is executed.
E. The subquery is executed for every updated row in the ORDERS table.

Answer: B,E

NEW QUESTION # 292
Which two statements execute successfully?

A. SELECT TO_CHAR('2019-DEC-25 15:30" YY-MON-D HH24:M2', 'NLS_DATE LANGUAGE = AMERICAN') FROM DUAL;
B. SELECT TO _DATE (TO_ CHAR ('2019-DEC-25 03:30', 'YYYY-MON-DD HH12:MI')) FROM DUAL;
C. SELECT TO _ CHAR ('2019-DEC-25 15:30'.'YYYY-MON-DD HH24:MI')
FROM DUAL
D. SELECT TO _ CHAR (TO_ DATE ('2019-DEC-25 03:30','YYYY-MON-DD HH12:MI')) FROM DUAL
E. SELECT TO_ DATE('2019-DEC-25 15:30' 'YYYY-MON-DD HH24:MI', 'NLS_ DATE_ LANGUAGE
=AMERICAN' ) FROM DUAL;

Answer: D,E

Explanation:
* A: This statement is correct. It uses the TO_DATE function with a proper date string, format mask, and
* NLS_DATE_LANGUAGE setting.
* B: This statement will not execute successfully because the syntax of the TO_CHAR function is incorrect. The date string should be a DATE data type when used with TO_CHAR, and the format mask and NLS parameter are incorrectly specified.
* C: This statement will not execute successfully because it is redundant to use TO_CHAR and then immediately convert it back to a date with TO_DATE without specifying a proper format mask.
* D: This statement is correct. It converts a string to a DATE using TO_DATE and then back to a string with TO_CHAR, without specifying a format which defaults to the session's NLS_DATE_FORMAT.
* E: This statement will not execute successfully because TO_CHAR is used incorrectly; the first argument must be of DATE data type when you're using a date format mask.
References for the TO_DATE and TO_CHAR functions and their proper usage can be found in the Oracle Database SQL Language Reference 12c documentation.

NEW QUESTION # 293
......

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Oracle Database SQL Sample Questions (Q288-Q293):

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