The number of rowing oars that must be carried in a motor-propelled open lifeboat on a cargo vessel is（）.

相似题目

• Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER  Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME  VARCHAR2(25) Which three statements insert a row into the table? （）

  A . INSERT INTO employees VALUES ( NULL, 'John', 'Smith'); B . INSERT INTO employees( first_name, last_name) VALUES( 'John', 'Smith'); C . INSERT INTO employees VALUES ( '1000', 'John', NULL); D . INSERT INTO employees (first_name, last_name, employee_id) VALUES ( 1000, 'John', 'Smith'); E . INSERT INTO employees (employee_id) VALUES (1000); F . INSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, 'John', ' ')

  查看最佳答案

• Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?（）

  A . SELECT UNIQUE dept FROM staff B . SELECT DISTINCT dept FROM staff C . SELECT (dept) UNIQUE FROM staff D . SELECT (dept) DISTINCT FROM staff

  查看最佳答案

• The number of pulses of energy transmitted per second is call the（）.

  A . carrier frequency B . pulse repetition rate C . pulse length D . pulse repetition time

  查看最佳答案

• Which of the following best describes the lock protection provided by DB2 for the current row of a cursor?（）

  A . The cursor is only protected from updates and deletes by concurrent applications. B . The row is only protected from positioned updates and deletes that reference another cursor of the same application. C . The cursor is protected from positioned updates and deletes that reference another cursor of a different application. D . The row is protected from updates and deletes by the current application and from positioned updates and deletes that reference another cursor of the same application.

  查看最佳答案

• The length of the steering oar in a lifeboat is（）.

  A . shorter than the rowing oars B . the same length as the rowing oars C . longer than the rowing oars D . unrelated to the length of the rowing oar

  查看最佳答案

• Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?（）

  A . Define the column MAINID as NOT UPDATABLE B . Define the column MAINID as a PRIMARY KEY C . Define the column MAINID as a FOREIGN KEY D . Define an UPDATE trigger on table TABLEX

  查看最佳答案

• Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) Which three statements inserts a row into the table? （）

  A . INSERT INTO employees VALUES (NULL, 'JOHN','Smith'); B . INSERT INTO employees( first_name, last_name) VALUES ('JOHN','Smith'); C . INSERT INTO employees VALUES ('1000','JOHN','NULL'); D . INSERT INTO employees(first_name,last_name, employee_id) VALUES ('1000, 'john','Smith'); E . INSERT INTO employees (employee_id) VALUES (1000); F . INSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, 'john',")

  查看最佳答案

• The bottom row of plating next to the keel of a lifeboat is known as the（）.

  A . sheer strake B . bilge strake C . garboard strake D . keel ri

  查看最佳答案

• Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) Which three statements insert a row into the table? （）

  A . INSERT INTO employees VALUES (NULL, 'John', 'smith'); B . INSERT INTO employees (first_name, last_name) VALUES ('John', 'smith'); C . INSERT INTO employees VALUES ('1000, 'John', 'smith'); D . INSERT INTO employees (first_name, last_name, employee_id) VALUES (1000, 'John', 'smith'); E . INSERT INTO employees (employee_id) VALUES (1000); F . INSERT INTO employees ( employee_id, first_name, last_name, ) VALUES (1000, 'John','')

  查看最佳答案

• What type of constraint is used to ensure that each row inserted into the EMPLOYEE table with a value in the WORKDEPT column has a row with a corresponding value in the DEPTNO column of the DEPARTMENT table?（）

  A . A check constraint on the EMPLOYEE table B . A unique constraint on the EMPLOYEE table WORKDEPT column C . A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE table D . A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table

  查看最佳答案

• Which of the following will DELETE all of the rows from table T03?（）

  A . DELETE * FROM TABLE T03 B . DELETE ALL FROM T03 C . DELETE * FROM T03 D . DELETE FROM T03

  查看最佳答案

• Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）

  A . Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO. B . Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO). C . Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table. D . Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.

  查看最佳答案

• Gridview： How to change the image of an image control place in each row in a gridview：（）

  A . ItemDataBound B . Init  C . Prerender  D . <something I don‟t remember&gt

  查看最佳答案

• In Pit No. 2, to the left of the chariots is a formation of 108 horsemen and 180 saddled horses in _______ rows.

  查看最佳答案

• \the average man\=\the average number of the population\.( )

  查看最佳答案

• What is the main reason of the reduction of the grizzly bears' number？

  A．Lacking food. B．Forest deceasing. C．The coyote existing. D．Not clear yet.

  查看最佳答案

• I am Number Two in Row One.

  A．True B．False

  查看最佳答案

• The caller got the number of Stephanie Grant.

  查看最佳答案

• Number of the flight:

  查看最佳答案

• The number of sales（）

  查看最佳答案

• The door opens to reveal a row of desks, blackboards dense with chalked up grammar a

  A．A.filled in B．B.loaded with C．C.involved with D．D.surrounded with

  查看最佳答案

• Examine the structure of the EMPLOYEES table:Column name Data type RemarksEMPLOYEE_ID NUMBER NOT NULL, Primary KeyEMP_NAME VARCHAR2(30)JOB_ID VARCHAR2(20) NOT NULLSAL NUMBERMGR_ID NUMBER References EMPLOYEE_ID columnDEPARTMENT_ID NUMBER Foreign key to DEPARTMENT_ID columnof the DEPARTMENTS tableYou need to create a view called EMP_VU that allows the users to insert rows through the view. Which SQL statement, when used to create the EMP_VU view, allows the users to insert rows？（）

  A.CREATE VIEW emp_vu AS SELECT employee_id, emp_name, department_id FROM employees WHERE mgr_id IN (102, 120); B.CREATE VIEW emp_vu AS SELECT employee_id, emp_name, job_id, department_id FROM employees WHERE mgr_id IN (102, 120); C.CREATE VIEW emp_vu AS SELECT department_id, SUM(sal) TOTALSAL FROM employees WHERE mgr_id IN (102, 120) GROUP BY department_id; D.CREATE VIEW emp_vu AS SELECT employee_id, emp_name, job_id, DISTINCT department_id FROM employees;

  查看最佳答案

• 如果Number=3，请指出下列语句的真与假。 If Number = 3, point out the truth and false of the following statements. Int（Number * Number) = Number * Number

  查看最佳答案

• 如果Number=3，判断下列命题的真假。 If Number = 3, judge the truth of the following propositions. （Number*Number)＞=（2*Number)

  查看最佳答案