跑马场一周之长为1080米。甲、乙两人骑自行车从同一地点同时出发，朝同一方向行驶，经过54分后，甲追上了乙。如果甲每分减少50米，乙每分增加30米，从同一地点同时背向而行，则经过3分后两人相遇。原来甲、乙两人每分各行多少米？()

A.Unique

B.Check

C.Referential

D.Informational

A.When view V1 is created

B.Each time the REFRESH VIEW v1 statement is executed

C.Each time an SQL statement is executed against view V1

D.Only the first time an SQL statement is executed against view V1

A.服务器

B.存储

C.软件和自动化

D.人员

E.基础设施和网络

F.自然灾害

G.人为破坏

H.服务和技能

ame VARCHAR(9), dept SMALLINT CHECK (dept BETWEEN 10 AND 100),job CHAR(10) CHECK (job IN (‘Sales‘,‘Mgr‘,‘Clerk‘)), hiredate DATE, salary DECIMAL(7,2), comm DECIMAL(7,2), PRIMARY KEY (id), CONSTRAINT yearsal CHECK (YEAR(hiredate) > 2004 OR salary > 80500) );Which of the following INSERT statements will fail?（）

A.INSERT INTO employee VALUES (2, ‘Smith‘, 80, ‘Mgr‘, ‘09/03/2006‘, 80000, NULL)

B.INSERT INTO employee VALUES (4, ‘Smith‘, 86, ‘Mgr‘, ‘07/14/2003‘, 90000, NULL)

C.INSERT INTO employee VALUES (1, ‘Smith‘, 55, ‘Sales‘, ‘07/14/2003‘, NULL, NULL)

D.INSERT INTO employee VALUES (3, ‘Smith‘, 33, ‘Analyst‘, ‘11/26/2006‘, 90000, NULL)

A.arp

B.smit

C.chdev

D.ifconfig

previously ordered and committed within the connection. The table also needs to be cleaned up and automatically removed each time a connection is ended. Assuming the ITEMS table was created with the following SQL statement:CREATE TABLE items item_no INT, item_name CHAR(5), item_qty INT)Which of the following SQL statements will provide the table definition that meets the specified requirements?（）

A.DECLARE GLOBAL TEMPORARY TABLE tracker AS (SELECT item_no, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS ON DISCONNECT DROP TABLE

B.DECLARE GLOBAL TEMPORARY TABLE tracker AS (SELECT item_no, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS

C.CREATE TABLE systmp.tracker AS (SELECT item_num, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS

D.CREATE TABLE tracker AS (SELECT item_num, item_name FROM items) ON COMMIT PRESERVE ROWS ON DISCONNECT DROP TABLE

A.chnfs-bnewvalue

B.chnfs-N-bnewvalue

C.chnfs-I-bnewvalue

D.netstat-snewvalue

A.Package

B.Trigger

C.Stored Procedure

D.Informational Constraint

ewcodeovertheoldcodeintheappropriatedirectoryononeofthenodesasindicatedbytheHACMPevententry.Theclusterwassynchronized.Duringafallovertest，thebackupsystemdidnotbehaveasexpected.Whatisthemostlikelyproblem？（）

A.Thenewpre-eventprogramwasnodelockedtoahostname

B.Thenewpre-eventprogramwasnotmadeexecutableonalnodes.

C.Thenewpre-eventprogramwasnotcompatiblewiththebackupmachine.

D.Thenewpre-eventprogramwasnotpropagatedtoallthenodesinthecluster.

A.Foreign key references cannot cross schema boundaries.

B.A DB2 user must be created before a schema with the same name can be created.

C.If no schema is specified when an object is created, the default schema PUBLIC is used.

D.A schema enables the creation of multiple objects in a database without encountering namespace collisions.