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数据库零碎概念第六版答案(包括实践习题,习题)下载

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数据库零碎概念第六版答案(包括实践习题,习题)下载
数据库零碎概念第六版答案(包括实践习题,习题)例如3.11答案Exercises•WritethefollowingqueriesinSQL,usingtheuniversityschema.•FindthenamesofallstudentswhohavetakenatleastoneComp.Sci.course;makesuretherearenoduplicatenamesintheresult.•FindtheIDsandnamesofallstudentswhohavenottakenanycourseofferingbeforeSpring2009.11•Foreachdepartment,findthemaximumsalaryofinstructorsinthatdepartment.Youmayassumethateverydepartmenthasatleastoneinstructor.•Findthelowest,acrossalldepartments,oftheper-departmentmax-imumsalarycomputedbytheprecedingquery.Answer:•SQLquery:selectnamefromstudentnaturaljointakesnaturaljoincoursewherecourse.dept=’Comp.Sci.’•SQLquery:selectid,namefromstudentexceptselectid,namefromstudentnaturaljointakeswhereyear<2009Sincetheexceptoperatoreliminatesduplicates,thereisnoneedtouseaselectdistinctclause,althoughdoingsowouldnotaffectcorrectnessofthequery.•SQLquery:selectdept,max(salary)frominstructorgroupbydept 本软件ID:10007702

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评论信息

  • t2u:
    很全,找了很久总算找到了。需要的看我的博客,会赚点积分但不多,请理解。2020-04-25
  • weixin_38383069:
    很好,很全。2018-11-06
  • Little丶Jerry:
    很好,很全。2018-05-21

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