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● A project life cycle is a collection of generally sequential project (73)whose name and number are determined by the control needs of the organizat
某数据库中有员工关系E、产品关系P、仓库关系W和库存关系I,其中:员工关系E(employeelD,name,department)中的属性为:员工编号,姓名,部门;产品关系P(productID,name,model,size,color)中的属性为:产品编号,产品名称,型号,尺寸,颜色;仓库关
●将表employee中name列的修改权限赋予用户Liu,并允许其将该权限授予他人,应使用的SQL语句为:GRANT (52) ON TABLE employee TO Liu (53) ;(52)A.UPDATE(name)B.DELETEC.SELECTD.INSERT(53)A.FORAL
●以下的SQL 99语句,Student与Person之间的关系是 (62) 。CREATE TYPE Person(name char(20),address varchar(50));CREATE TYPE Student(under Person(degree char(20)departm
选出正确的关系代数表达式。查询所有“外科”病区和“内科”病区的所有医生姓名; A.σName="外科"∨Name="内科"(π4(Q))B.σName="外科"∧Name="内科"(π4(Q))C.π4(σName="外科"∨Name="内科"(Q))D.π4(σName="外科"∧Name="内
●Quality management(74).(74) A. is another name for careful inspectionsB. is inversely related to productivityC. is primarily the responsibility of m
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