单项选择题
Evaluate the set of SQL statements:
What is true about the set?（）
A. The DESCRIBE DEPT statement displays the structure of the DEPT table.
B. The ROLLBACK statement frees the storage space occupies 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.
相关考题
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单项选择题
Which SQL statement defines the FOREIGN KEY constraint on the DEPTNO column of the EMP table?（）
A.
B.
C.
D.
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多项选择题
Which three SELECT statements displays 2000 in the format "$2,000.00"? （）
A. SELECT TO CNAR(2000, '$#,###.##') FROM dual;
B. SELECT TO CNAR(2000, '$0,000.00') FROM dual;
C. SELECT TO CNAR(2000, '$9,999.00') FROM dual;
D. SELECT TO CNAR(2000, '$9,999.99') FROM dual;
E. SELECT TO CNAR(2000, '$2,000.00') FROM dual;
F. SELECT TO CNAR(2000, '$N,NNN.NN') FROM dual; -
多项选择题
For which two constraints does the Oracle Server implicitly create a unique index? （）
A. NOT NULL
B. PRIMARY KEY
C. FOREIGN KEY
D. CHECK
E. UNIQUE
