多项选择题
Evaluate the SQL statement
DROP TABLE DEPT;
Which four statements are true of the SQL statement? （）
A.You cannot roll back this statement.
B.All pending transactions are committed.
C.All views based on the DEPT table are deleted.
D.All indexes based on the DEPT table are dropped.
E.All data in the table is deleted, and the table structure is also deleted.
F.All data in the table is deleted, but the structure of the table is retained.
G.All synonyms based on the DEPT table are deleted.
相关考题
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单项选择题
Which SQL statement generates the alias Annual Salary for the calculated column SALARY*12?（）
A.SELECT ename, salary*12 'Annual Salary' FROM employees;
B.SELECT ename, salary*12 "Annual Salary" FROM employees;
C.SELECT ename, salary*12 AS Annual Salary FROM employees;
D.SELECT ename, salary*12 AS INITCAP("ANNUAL SALARY") FROM employees -
单项选择题
Which clause should you use to exclude group results?（）
A.WHERE
B.HAVING
C.RESTRICT
D.GROUP BY
E.ORDER BY -
多项选择题
Which two statements are true about constraints? （）
A.The UNIQUE constraint does not permit a null value for the column.
B.A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.
C.The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.
D.The NOT NULL constraint ensures that null values are not permitted for the column.
