Evaluate this SQL statement:SELECT ena...

单项选择题 Evaluate this SQL statement:
SELECT ename, sal, 12*sal+100
FROM emp;
The SAL column stores the monthly salary of the employee. Which change must be made to the above syntax to calculate the annual compensation as "monthly salary plus a monthly bonus of $100, multiplied by 12"?（）

A.No change is required to achieve the desired results.
B.SELECT ename, sal, 12*(sal+100) FROM emp;
C.SELECT ename, sal, (12*sal)+100 FROM emp;
D.SELECT ename, sal+100,*12 FROM emp;

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CREATE TABLE dept
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loc VARCHAR2(13));
ROLLBACK;
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A.The DESCRIBE DEPT statement displays the structure of the DEPT table.
B.The ROLLBACK statement frees the storage space occupied by the DEPT table.
C.The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.
D.The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

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2.多项选择题Which are DML statements?（）

A.COMMIT
B.MERGE
C.UPDATE
D.DELETE
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3.单项选择题Evaluate the SQL statement:SELECT ROUND(45.953, -1), TRUNC(45.936, 2)FROM dual;Which values are displayed?（）

A. 46 and 45
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4.多项选择题 Examine the structure of the EMPLOYEES table:
EMPLOYEE_ID NUMBER Primary Key
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A.INSERT INTO employees VALUES ( NULL, 'John', 'Smith');
B.INSERT INTO employees( first_name, last_name) VALUES( 'John', 'Smith');
C.INSERT INTO employees VALUES ( '1000', 'John', NULL);
D.INSERT INTO employees (first_name, last_name, employee_id) VALUES ( 1000, 'John', 'Smith');
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