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1Z0-051Oracle Database: SQL Fundamentals I

1. Evaluate the following CREATE TABLE commands:
CREATE TABLE orders
(ord_no NUMBER(2) CONSTRAINT ord_pk PRIMARY KEY,
ord_date DATE,
cust_id NUMBER(4));
CREATE TABLE ord_items
(ord_no NUMBER(2),
item_no NUMBER(3),
qty NUMBER(3) CHECK (qty BETWEEN 100 AND 200),
expiry_date date CHECK (expiry_date > SYSDATE),
CONSTRAINT it_pk PRIMARY KEY (ord_no,item_no),
CONSTRAINT ord_fk FOREIGN KEY(ord_no) REFERENCES orders(ord_no));
The above command fails when executed. What could be the reason?
A.SYSDATE cannot be used with the CHECK constraint.
B.The BETWEEN clause cannot be used for the CHECK constraint.
C.The CHECK constraint cannot be placed on columns having the DATE data type.
D.ORD_NO and ITEM_NO cannot be used as a composite primary key because ORD_NO is also the FOREIGN KEY.
Answer: A

2. SLS is a private synonym for the SH.SALES table.
The user SH issues the following command:
DROP SYNONYM sls;
Which statement is true regarding the above SQL statement?
A.Only the synonym would be dropped.
B.The synonym would be dropped and the corresponding table would become invalid.
C.The synonym would be dropped and the packages referring to the synonym would be dropped.
D.The synonym would be dropped and any PUBLIC synonym with the same name becomes invalid.
Answer: A
3. Which statement is true regarding the default behavior of the ORDER BY clause?
A.In a character sort, the values are case-sensitive.
B.NULL values are not considered at all by the sort operation.
C.Only those columns that are specified in the SELECT list can be used in the ORDER BY clause.
D.Numeric values are displayed from the maximum to the minimum value if they have decimal positions.
Answer: A