1z0-071 Exam Dumps | Examine these statements: CREATE TABLE alter_test (c1 VARCHAR2(10), c2 NUMBER(10)); INSERT INTO alter

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Question 103/144

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. c1 can be changed to NUMBER(10) and c2 can be changed to VARCHAN2 (10).

B. c2 can be changed to NUMBER(5) but c1 cannot be changed to VARCHAN2 (5).

C. c2 can be changed to VARCHAR2(10) but c1 cannot be changed to NUMBER (10).

D. c1 can be changed to NUMBER(10) but c2 cannot be changed to VARCHAN2 (10).

E. c1 can be changed to VARCHAR2(5) and c2 can be changed to NUMBER (12,2).

Correct Answer: E

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)).
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"

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