单选题Evaluate the CREATE TABLE statement:   CREATE TABLE products   (product_id NUMBER (6)  CONSTRAINT prod_id_pk PRIMARY KEY,  product_name VARCHAR2 (15));   Which statement is true regarding the PROD_ID_PK constraint?()A It would be created only if a unique index is manually created first.B It would be created and would use an automatically created unique index.C It would be created and would use an automatically created nonunique index.D It would be created and remains in a disabled state because no index is specified in the command.

单选题
Evaluate the CREATE TABLE statement:   CREATE TABLE products   (product_id NUMBER (6)  CONSTRAINT prod_id_pk PRIMARY KEY,  product_name VARCHAR2 (15));   Which statement is true regarding the PROD_ID_PK constraint?()
A

 It would be created only if a unique index is manually created first.

B

 It would be created and would use an automatically created unique index.

C

 It would be created and would use an automatically created nonunique index.

D

 It would be created and remains in a disabled state because no index is specified in the command.


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单选题The PRODUCTS table has these columns: PRODUCT_ID NUMBER(4) PRODUCT_NAME VARCHAR2(45) PRICE NUMBER(8,2) Evaluate this SQL statement: SELECT * FROM PRODUCTS ORDER BY price, product _ name; What is true about the SQL statement? ()AThe results are not sorted.BThe results are sorted numerically.CThe results are sorted alphabetically.DThe results are sorted numerically and then alphabetically.

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多选题Examine the SQL statements that creates ORDERS table: CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL STATUS VARCHARD2(10) CHECK (status IN ('CREDIT','CASH')), PROD_ID_NUMBER REFERENCES PRODUCTS(PRODUCT_ID), ORD_TOTAL NUMBER, PRIMARY KEY (order id, order date)); For which columns would an index be automatically created when you execute the aboveSQL statement? ()ASER_NOBORDER_IDCSTATUSDPROD_IDEORD_TOTALFComposite index on ORDER_ID and ORDER_DATE

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