请观察PRODUCT表和SUPPLIER表的结构: PRODUCT PRODUCT_ID NUMBER NOT NULL, Primary Key PRODUCT_NAME VARCHAR2 (25) SUPPLIER_ID NUMBER ( SUPPLIER表的SUPPLIER_ID的外键) LIST_PRICE NUMBER (7,2) COST NUMBER (7,2) QTY_IN_STOCK NUMBER QTY_ON_ORDER NUMBER REORDER_LEVEL NUMBER REORDER_QTY NUMBER SUPPLIER SUPPLIER_ID NUMBER NOT NULL, Primary Key SUPPLIER_NAME VARCHAR2 (25) ADDRESS VARCHAR2 (30) CITY VARCHAR2 (25) REGION VARCHAR2 (10) POSTAL_CODE VARCHAR2 (11) 请评估以下语句: ALTER TABLE suppliers DISABLE CONSTRAINT supplier_id_pk CASCADE; 该语句用于执行什么任务()
第1题:
数据库中的中的PROFITS表中PRODUCT_NAME与SALE_PERIOD列建立主键。下列哪个语句无法定义这个主键?()
第2题:
“雇员”表包含以下列: 雇员标识NUMBER 姓氏VARCHAR2(25) 名字VARCHAR2(25) 部门标识NUMBER 职务标识NUMBER 经理标识NUMBER 薪金NUMBER(9,2) 佣金NUMBER(7,2) 聘用日期DATE 以下哪条SELECT语句可用于显示部门70中薪金最低的10位员工()
第3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?()
第4题:
Which SQL statement defines the FOREIGN KEY constraint on the DEPTNO column of the EMP table?()
第5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? ()
第6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?()
第7题:
Examine the SQL statement that creates ORDERS table: CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL, STATUS VARCHAR2(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 above SQL statement? ()
第8题:
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7
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9
第9题:
displaying the minimum list price for each product status
displaying all supplier IDs whose average list price is more than 500
displaying the number of products whose list prices are more than the average list price
displaying all the products whose minimum list prices are more than the average list price of products having the product status orderable
displaying the total number of products supplied by supplier 102071 and having product status OBSOLETE
第10题:
The results are not sorted.
The results are sorted numerically.
The results are sorted alphabetically.
The results are sorted numerically and then alphabetically.
第11题:
SER_NO
ORDER_ID
STATUS
PROD_ID
ORD_TOTAL
composite index on ORDER_ID and ORDER_DATE
第12题:
内部查询:ORDER BY新余额DESC
内部查询:WHERE ROWNUM=800
外部查询:ORDER BY新余额DESC
内部查询:SELECT客户标识,新余额ROWNUM
第13题:
评估此CREATE TABLE语句的执行结果: CREATE TABLE part( part_id NUMBER, part_name VARCHAR2(25), manufacturer_id NUMBER(9), retail_price NUMBER(7,2) NOT NULL, CONSTRAINT part_id_pk PRIMARY KEY(part_id), CONSTRAINT cost_nn NOT NULL(cost), CONSTRAINT FOREIGN KEY (manufacturer_id) REFERENCES manufacturer(id)); 哪一行会导致产生错误()
第14题:
在oracle数据库中,检查用于创建表的命令:SQL>CREATE TABLEorders(oid NUMBER(6)PRIMARY KEY,odate DATE,ccode NUMBER(6),oamt NUMBER(10,2))TABLESPACE users;下列哪两种说法正确()。
第15题:
Examine the SQL statement that creates ORDERS table: CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL, STATUS VARCHAR2(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 above SQL statement? ()
第16题:
Which statement accomplish this? ()
第17题:
Evaluate the following statements: CREATE TABLE purchase_orders (po_id NUMBER(4), po_date TIMESTAMP, supplier_id NUMBER(6), po_total NUMBER(8,2), CONSTRAINT order_pk PRIMARY KEY(po_id)) PARTITION BY RANGE(po_date) (PARTITION Q1 VALUES LESS THAN (TO_DATE(?1-apr-2007?d-mon-yyyy?), PARTITION Q2 VALUES LESS THAN (TO_DATE(?1-jul-2007?d-mon-yyyy?), PARTITION Q3 VALUES LESS THAN(TO_DATE(?1-oct - 2007?d-mon-yyyy?), PARTITION Q4 VALUES LESS THAN (TO_DATE(?1-jan-2008?d-mon-yyyy?)); CREATE TABLE purchase_order_items (po_id NUMBER(4) NOT NULL, product_id NUMBER(6) NOT NULL, unit_price NUMBER(8,2), quantity NUMBER(8), CONSTRAINT po_items_fk FOREIGN KEY (po_id) REFERENCES purchase_orders(po_id)) PARTITION BY REFERENCE(po_items_fk); What are the two consequences of the above statements?()
第18题:
Which SQL statement defines a FOREIGN KEY constraint on the DEPTNO column of the EMP table?()
第19题:
新创建一个对PO_NUM列的PRIMARYKEY约束条件
删除并重新创建对PO_NUM列的PRIMARYKEY以及FOREIGNKEY的约束条件
禁用依赖于PO_NUM列的所有FOREIGNKEY约束条件
禁用对PO_NUM列的约束条件,同时创建PRIMARYKEY索引
第20题:
It would be created only if a unique index is manually created first.
It would be created and would use an automatically created unique index.
It would be created and would use an automatically created nonunique index.
It would be created and remains in a disabled state because no index is specified in the command.
第21题:
SER_NO
ORDER_ID
STATUS
PROD_ID
ORD_TOTAL
composite index on ORDER_ID and ORDER_DATE
第22题:
SER_NO
ORDER_ID
STATUS
PROD_ID
ORD_TOTAL
Composite index on ORDER_ID and ORDER_DATE
第23题:
To find the tax percentage for each of the employees.
To list the name, job id, and manager name for all the employees.
To find the name, salary, and department name of employees who are not working with Smith.
To find the number of employees working for the Administrative department and earning less then 4000.
To display name, salary, manager ID, and department name of all the employees, even if the employees do not have a department ID assigned.