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  • 2.交叉表查询交叉表查询可以在一种紧凑的、类似于电子表格的格式中,显示来源于表中某个字段的合计值、计算值、平均值等。交叉表查询将这些数据分组,一组列在数据表的左侧,一组列在数据表的上部。3.参数查询参数查询...

    access提供5种类型的查询,分类如下

    1.选择查询

    选择查询是最常见的查询类型,它从一个或多个表中检索数据,在一定的限制条件下,还可以通过选择查询来更改相关表中的记录。

    2.交叉表查询

    交叉表查询可以在一种紧凑的、类似于电子表格的格式中,显示来源于表中某个字段的合计值、计算值、平均值等。交叉表查询将这些数据分组,一组列在数据表的左侧,一组列在数据表的上部。

    3.参数查询

    参数查询会在执行时弹出对话框,提示用户输入必要的信息(参数),然后按照这些信息进行查询。参数查询便于作为窗体和报表的基础。

    4.操作查询

    操作查询是在一个操作中更改许多记录的查询,操作查询又可分为四种类型:删除查询、更新查询、追加查询和生成表查询。删除查询,从一个或多个表中删除一组记录。更新查询,对一个或多个表中的一组记录进行批量更改。例如,可以给某一类雇员增加5%的工资。使用更新查询,可以更改表中已有的数据。追加查询,将一个(或多个)表中的一组记录添加到另一个(或多个)表的尾部。生成表查询,根据一个或多个表中的全部或部分数据新建表。

    5.SQL查询

    SQL查询是使用SQL语句创建的查询。经常使用的SQL。查询包括联合查询、传递查询、数据定义查询和子查询等。用于创建或更改数据库中的对象,如Access或SOL Server表等。

    Access功能介绍

    1.“开始”功能区中包括视图、剪贴板、字体、格式文本、记录、排序和筛选、查找、中文简繁转换8个分组,用户可以在“开始”功能区中对Access2007进行操作例如复制粘贴数据、修改字体和字号、排序数据等。

    2.“创建”功能区中包括表、窗体、报表、其他和特殊符号5个分组,“创建”功能区中包含的命令主要用于创建Access2007的各种元素。

    3.“外部数据”功能区包括导入、导出、收集数据、SharePoint列表4个分组,在“外部数据”功能区中主要对Access2007以外的数据进行相关处理。

    4.“数据库工具”功能区包括宏、显示/隐藏、分析、移动数据、数据库工具5个分组,主要针对Access2007数据库进行比较高级的操作。

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    移动数据分析

    移动数据分析 (Mobile Analytics) 是阿里云推出的一款移动App数据统计分析产品,提供通用的多维度用户行为分析,支持日志自主分析,助力移动开发者实现基于大数据技术的精细化运营、提升产品质量和体验、增强用户黏性。

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    移动推送:到达率高、延迟低、稳定性高、基础设施强。

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    移动热修复:快速修复、安全稳定、极简接入

    ","linkTo":"立即抢购","link":"https://common-buy.aliyun.com/?commodityCode=hotfix_device_bag#/buy"},{"linkContent":"

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    移动研发平台 EMAS,爆款产品0元试用

    一站式研发平台快速搭建移动应用,包括HTTPDNS、移动推送、移动热修复、

    移动测试、移动监控等,打造移动应用全周期服务能力

    爆款产品资源包

    HTTPDNS:域名防劫持、调度精准、实时生效。>

    移动热修复:快速修复、安全稳定、极简接入

    移动监控:崩溃分析、性能分析、远程日志

    移动推送:到达率高、延迟低、稳定性高、基础设施强。

    展开全文
  • 含义:多表查询,当查询的字段来自多个表 笛卡尔乘积 发生原因:没有有效的连接条件 添加有效的连接条件的分类: 按年代分类: SQL92标准 仅支持内连接 SQL99标准(推荐)支持内连接+外连接(左外+右外)+交叉连接 ...

    2f091b67b6c1d88e33475d68ecb5729f.png

    #连接查询-1


    /*
    连接查询
    含义:多表查询,当查询的字段来自多个表
    
    笛卡尔乘积
    发生原因:没有有效的连接条件
    添加有效的连接条件的分类:
    按年代分类:
    SQL92标准 仅支持内连接
    SQL99标准(推荐)支持内连接+外连接(左外+右外)+交叉连接
    
    按功能分类:
    内连接:
    	等值连接
    	非等值连接
    	自连接
    外连接:
    	左外连接
    	右外连接
    交叉连接				
    */
    SELECT * FROM beauty;
    SELECT* FROM boys;
    SELECT NAME,boyname FROM boys,beauty;
    /*
    12*4 笛卡尔集错误-笛卡尔乘积
    发生原因:没有有效的连接条件,
    select count(*) from beauty;
    输出12行
    select count(*) from boys;
    输出4行
    
    最终结果:48行
    
    */
    SELECT NAME,boyname FROM boys,beauty
    WHERE beauty.boyfriend_id=boys.id;
    #SQL92标准
    #1/等值连接
    #查询男神名对应的女神名
    
    SELECT NAME,boyname 
    FROM boys,beauty
    WHERE beauty.boyfriend_id=boys.id;
    
    #查询员工名及对应的部门名
    SELECT last_name,department_name
    FROM employees,departments
    WHERE employees.department_id=departments.department_id;
    #2/为表起别名-提高语句的简洁度,区分多个重名的字段
    
    #查询员工名/工种号/工种名
    SELECT last_name,employees.job_id,job_title
    FROM employees,jobs
    WHERE employees.job_id=jobs.job_id;
    
    SELECT last_name,e.job_id,job_title
    FROM employees AS e,jobs AS j #顺序可变
    WHERE e.job_id=j.job_id; #交集部分
    #起了别名,不认识原始表名
    #顺序
    select                5
    from                  1
    where                 2
    group by              3
    having                4
    order by              6
    #3/查询的两个表顺序可变
    #4/可做筛选
    #有奖金的员工名/部门名
    SELECT last_name,department_name
    FROM employees AS e ,departments AS d
    WHERE commission_pct IS NOT NULL
    AND e.department_id=d.department_id;
    
    SELECT last_name,department_name
    FROM employees AS e ,departments AS d
    WHERE e.department_id=d.department_id
    AND commission_pct IS NOT NULL;
    
    #查询城市名中第二个字符为o的部门名和城市名
    SELECT department_name,city
    FROM departments AS d,locations AS l
    WHERE city LIKE '_o%'
    AND d.location_id=l.location_id;
    #5/添加分组
    #查询每个城市的部门个数
    SELECT COUNT(department_id),city
    FROM departments AS d,locations AS l
    WHERE d.location_id=l.location_id
    GROUP BY city;
    
    #查询有奖金的每个部门的部门名和部门的领导编号和该部门的最低薪资
    SELECT department_name,e.manager_id,MIN(salary)
    FROM departments AS d,employees AS e
    WHERE commission_pct IS NOT NULL
    AND d.manager_id=e.manager_id
    GROUP BY department_name;
    
    #修改
    SELECT department_name,e.manager_id,MIN(salary)
    FROM departments AS d,employees AS e
    WHERE commission_pct IS NOT NULL
    AND d.manager_id=e.manager_id
    GROUP BY department_name,e.manager_id;
    #6/添加排序
    #查询每个工种的工种名和员工的个数,并且按照员工个数排序
    SELECT job_title,COUNT(*)
    FROM jobs AS j,employees AS e
    WHERE j.job_id=e.job_id
    GROUP BY job_title
    ORDER BY COUNT(*) DESC;
    #7/实现3表连接
    #查询员工名/部门名/所在城市
    SELECT last_name,department_name,city
    FROM employees AS e,departments AS d,locations AS l
    WHERE e.department_id=d.department_id AND d.location_id=l.location_id;
    
    SELECT last_name,department_name,city
    FROM employees AS e,departments AS d,locations AS l
    WHERE e.department_id=d.department_id 
    AND d.location_id=l.location_id
    AND city LIKE '%a%';
    /*
    总结
    等值连接
    1/多表连接的结果为多表的交集
    2/n表连接,至少需要N-1个连接条件
    3/多表的顺序没有要求
    4/一般需要为表格起别名
    5/连接可以搭配之前所有的子句使用
    */
    展开全文
  • T-SQL高级查询

    2015-04-26 14:17:13
    查询表的时候,有时候中间需要重复使用,这些子查询被重复查询调用,不但效率低,而且可读性低,不利于理解。那么公式表达式可以解决这个问题。 我们可以将公式表达式(CET)视为临时结果集,在select、...
  • 非常方便的色环电阻查询工具,操作简单,通俗易懂 是电气工程师和电子维修、制作,等人员的好帮手 其他功能包括:RC时间常数计算,电阻串、并联计算,电阻反向串、并联计算,变压器计算器,LM317三端稳压器件计算,...
  • 技术、硬件相关开发技术、网络开发技术、Web编程、加密、安全与软件注册、数据结构与算法、C#高级开发、实用工具、程序打包等共21章,572个实例。  本书附有配套光盘。光盘提供了书中所有实例的源代码,全部源...
  • 技术、硬件相关开发技术、网络开发技术、Web编程、加密、安全与软件注册、数据结构与算法、C#高级开发、实用工具、程序打包等共21章,572个实例。  本书附有配套光盘。光盘提供了书中所有实例的源代码,全部源...
  • 技术、硬件相关开发技术、网络开发技术、Web编程、加密、安全与软件注册、数据结构与算法、C#高级开发、实用工具、程序打包等共21章,572个实例。  本书附有配套光盘。光盘提供了书中所有实例的源代码,全部源...
  • 1.查询所有班级的期末成绩平均分,并按照平均分降序排序。 select classno,avg(final) from student,score where student.studentno=score.studentno group by classno order by avg(final) des.
    1. 掌握多表连接查询、子查询、游标、大对象类型数据的基本概念。
    2. 掌握多表连接的各种方法,包括内连接、外链接和交叉连接等。
    3. 掌握子查询的方法,包括相关子查询和不相关子查询。
    4. 掌握游标处理结果集的基本过程。

    1.查询所有班级的期末成绩平均分,并按照平均分降序排序。

    select classno,avg(final) from student,score where student.studentno=score.studentno group by classno order by avg(final) desc
    

    2.查询教师基本信息和教授课程信息,其中包括未分配课程的教师信息。

    select * from teacher left join teach_class on teacher.teachno=teach_class.teacherno 
    

    3.查询160501班级中选修了“韩晋升”老师讲授的课程的学生学号、姓名、课程号和期末成绩。

     select student.studentno,sname,courseno,final from student,score 
    where student.studentno=score.studentno and classno=160501 and
    courseno=(select courseno from teach_class where teacherno=(select teachno from teacher where tname='韩晋升'))
    

    4.查询每门课程的课程号、课程名和选修该课程的学生人数,并按所选人数升序排序。

    select score.courseno,COUNT(*) as 选课人数  from score inner join course on course.courseno=score.courseno group by score.courseno order by COUNT(studentno) desc
    

    5.查询两门及以上课程的期末成绩超过80分的学生姓名及平均成绩。

     select student.sname,AVG(final) as '平均成绩' from student, score where final>80 and student.studentno=score.studentno group by student.studentno,student.sname having COUNT(*)>=2
    

    6.查询入学考试成绩最高的学生学号、姓名和入学成绩。

    select top 1 sname,studentno,point from student order by point desc
    

    7.查询同时教授c05127号和c05109号课程的教师信息。

    select * from teacher left join teach_class on teacher.teachno=teach_class.teacherno where courseno='c05127' and courseno='c05109'
    

    8.查询至少选修了姓名为“韩吟秋”的学生所选修课程中一门课程的学生学号和姓名。

    declare @a nchar(10)
    select @a=(select studentno from student where sname='韩吟秋')
    select studentno,sname from student where studentno in (select studentno from score where courseno in (select courseno from score where studentno=@a))
    

    9.查询所有教授c05127号课程的教师信息。

    select * from teacher where teachno in (select teacherno from teach_class where courseno='c05127')
    

    10.查询没有被任何学生选修的课程编号、课程名称和学分。

    select course.courseno,cname,credit,case when score.courseno is null then '没选课' else score.courseno end from course left join score on course.courseno=score.courseno
    

    11.查询“C语言”课程期末成绩比“电子技术”课程期末成绩高的所有学生的学号和姓名。

    select a.studentno,a.sname from
    (select student.studentno,sname,final from student,score,course where 
    student.studentno=score.studentno and score.courseno=course.courseno and course.cname=N'C语言') as a,
    (select student.studentno,sname,final from student,score,course where
    student.studentno=score.studentno and score.courseno=course.courseno and course.cname=N'电子技术') as b
    where a.final>b.final and a.studentno=b.studentno
    

    12.查询所有班级期末平均成绩的最高分,并将其赋值给变量,通过PRINT语句输出。

    declare @max float
    set @max=(select top 1 a.max from(select AVG(final) as 'max' from student,score,course 
    where student.studentno=score.studentno and score.courseno=course.courseno 
    group by student.classno)as a)
    print cast(@max as varchar(30))
    select @max
    

    13.使用游标输出学生姓名、选修课程名称和期末考试成绩。

    declare @sname nchar(8),@cname nchar(10),@final numeric(6,2)
    declare sc cursor
    for
    select sname,cname,final from score join student on
    (score.studentno=student.studentno)join course on(score.courseno=course.courseno)
    open sc
    fetch next from sc into @sname,@cname,@final
    print '学生姓名  课程名称  期末成绩'
    print '------------------------------'
    while @@FETCH_STATUS=0
    begin
          print @sname+@cname+cast(@final as nchar(6))
          fetch next from sc into @sname,@cname,@final
    end
    close sc
    deallocate sc
    

    14.使用游标统计每个学院教师所开设课程的选修率。

    declare @a nchar(30),@b int,@avg float
    declare cur cursor static
    for 
        select department,count(*) as '选修课数' from class where class.classno in
        (select student.classno from student group by classno)
        group by department
    open cur
    fetch cur into @a,@b
    set @avg=@b/(select COUNT(*) from class where department=@a)
    print @avg
    while @@FETCH_STATUS=0
    begin
           fetch next from cur into @a,@b
           set @avg=@b/(select COUNT(*) from class where department=@a)
           print @a
           print @avg
    end
    close cur
    deallocate cur
    

    15.使用游标计算学生期末成绩的等级,并更新level列。

    declare @sname nchar(30),@cname nchar(30),@final float
    declare stu cursor static
    for
        select sname,final,cname from student,score,course where
        student.studentno=score.studentno and course.courseno=score.courseno
    open stu
    fetch stu into @sname,@final,@cname
    if @final>=90  print N'优秀'+@sname+@cname
    else if @final>=80 and @final<90 print N'良好'+@sname+@cname
    else if @final>=70 and @final<80 print N'中等'+@sname+@cname
    else if @final>=60 and @final<70 print N'及格'+@sname+@cname
    else if @final>=60 print N'差等'+@sname+@cname
    while @@FETCH_STATUS=0
    begin
           fetch next from stu into @sname,@final,@cname
    if @final>=90  print N'优秀'+@sname+@cname
    else if @final>=80 and @final<90 print N'良好'+@sname+@cname
    else if @final>=70 and @final<80 print N'中等'+@sname+@cname
    else if @final>=60 and @final<70 print N'及格'+@sname+@cname
    else if @final>=60 print N'差等'+@sname+@cname
    end
    close stu
    deallocate stu
    
    展开全文
  • 数据库的EXCEL 1、实验目的 (1)掌握多连接查询、子查询的基本概念 ...(1)查询所有班级的期末成绩平均分,并按照平均分降序排列 USE database1 select qq.classno,avg(qq.final) as '班级平

    数据库表的EXCEL表


    1、实验目的

    (1)掌握多表连接查询、子查询的基本概念

    (2)掌握多表连接的各种方法,包括内连接、外连接、交叉连接等

    (3)掌握子查询的方法,包括相关子查询和不相关子查询。

    2、实验内容

    (1)查询所有班级的期末成绩平均分,并按照平均分降序排列

    USE database1

    select qq.classno,avg(qq.final) as '班级平均分'

    from

    (select classno ,final 

    from student  join score

    on student.studentno=score.studentno)qq

    group by qq.classno

    order by '班级平均分' desc

    (2)查询教师基本信息和教授课程信息,其中包括未分配课程的教师信息

    USE database1

    select *

    from 

    (select teacher.*,teach_class.courseno

    from teacher left join teach_class

    on teacher.teacherno=teach_class.teacherno)

    teacher_course left join course

    on teacher_course.courseno=course.courseno

    (3)查询‘090501’班级中选修了‘韩晋升’老师讲授的课程的学生的学号、姓名、课程名和期末成绩

    USE database1

    select *

    from student join

    (select studentno

    from score where score.courseno=

    (select teach_class.courseno

    from teach_class

    where teach_class.teacherno=(select teacherno

    from teacher

    where teacher.tname='韩晋升')and teach_class.classno='090501'))qq

    on student.studentno=qq.studentno

    (4)查询每门课程的课程号、课程名和选修该课程的学生人数,并按所选人数升序排序

    use database1

    select qq.courseno,qq.cname,count(qq.courseno) as '选择该门课程的学生人数'

    from

    (select course.courseno,course.cname

    from course join score

    on course.courseno=score.courseno) as qq

    group by qq.courseno,qq.cname

    order by '选择该门课程的学生人数'

    (5)查询两门及以上课程的期末成绩超过80分的学生的姓名及平均成绩。

    use database1

    select qq.studentno,student.sname,qq.ww as '平均成绩'

    from 

    (select score.studentno,avg(score.final) as ww

    from score

    where score.final>80

    group by score.studentno

    having count(score.studentno)>1)as qq join student

    on qq.studentno=student.studentno

    (6)查询“C语言”课程期末成绩比“电子技术”课程期末成绩高的所有学生的学号和姓名。

    USE database1

    declare @aa nvarchar(255)

    declare @bb nvarchar(255)

    set @aa=(select course.courseno from course where course.cname in ('C语言'))

    set @bb=(select course.courseno from course where course.cname in ('电子技术'))

    select student.studentno,student.sname from student where student.studentno in

    (select b.studentno from

    (select score.studentno,score.final from score where score.courseno=@aa)as b join

    (select score.studentno,score.final from score where score.courseno=@bb)as c on b.studentno=c.studentno 

    and b.final>c.final)

    (7)查询所有班级期末平均成绩的最高分,并将其值赋给变量,通过PRINT语句输出。

    USE database1

    declare @aa float

    set @aa=(select max(rr.ww) from

     (

    select avg(qq.final) as ww

      from

         (select classno,final 

          from student  join score

          on student.studentno=score.studentno

         )as qq

      group by qq.classno)

     as rr)

    print CAST(@aa AS varchar(12))

    (8)查询至少选修了姓名为“韩吟秋”的学生所选修课程中一门课的学生的学号和姓名。

    USE database1

    select student.studentno,student.sname from student where student.studentno in(

    select score.studentno from score where score.courseno in

     (select score.courseno from score where 

       score.studentno=(select student.studentno from student where student.sname='韩吟秋')

     )and score.studentno!=(select student.studentno from student where student.sname='韩吟秋'))

    1、实验目的

    (1)掌握多表连接查询、子查询的基本概念

    (2)掌握多表连接的各种方法,包括内连接、外连接、交叉连接等

    (3)掌握子查询的方法,包括相关子查询和不相关子查询。

    2、实验内容

    (1)查询所有班级的期末成绩平均分,并按照平均分降序排列

    USE database1

    select qq.classno,avg(qq.final) as '班级平均分'

    from

    (select classno ,final 

    from student  join score

    on student.studentno=score.studentno)qq

    group by qq.classno

    order by '班级平均分' desc

    (2)查询教师基本信息和教授课程信息,其中包括未分配课程的教师信息

    USE database1

    select *

    from 

    (select teacher.*,teach_class.courseno

    from teacher left join teach_class

    on teacher.teacherno=teach_class.teacherno)

    teacher_course left join course

    on teacher_course.courseno=course.courseno

    (3)查询‘090501’班级中选修了‘韩晋升’老师讲授的课程的学生的学号、姓名、课程名和期末成绩

    USE database1

    select *

    from student join

    (select studentno

    from score where score.courseno=

    (select teach_class.courseno

    from teach_class

    where teach_class.teacherno=(select teacherno

    from teacher

    where teacher.tname='韩晋升')and teach_class.classno='090501'))qq

    on student.studentno=qq.studentno

    (4)查询每门课程的课程号、课程名和选修该课程的学生人数,并按所选人数升序排序

    use database1

    select qq.courseno,qq.cname,count(qq.courseno) as '选择该门课程的学生人数'

    from

    (select course.courseno,course.cname

    from course join score

    on course.courseno=score.courseno) as qq

    group by qq.courseno,qq.cname

    order by '选择该门课程的学生人数'

    (5)查询两门及以上课程的期末成绩超过80分的学生的姓名及平均成绩。

    use database1

    select qq.studentno,student.sname,qq.ww as '平均成绩'

    from 

    (select score.studentno,avg(score.final) as ww

    from score

    where score.final>80

    group by score.studentno

    having count(score.studentno)>1)as qq join student

    on qq.studentno=student.studentno

    (6)查询“C语言”课程期末成绩比“电子技术”课程期末成绩高的所有学生的学号和姓名。

    USE database1

    declare @aa nvarchar(255)

    declare @bb nvarchar(255)

    set @aa=(select course.courseno from course where course.cname in ('C语言'))

    set @bb=(select course.courseno from course where course.cname in ('电子技术'))

    select student.studentno,student.sname from student where student.studentno in

    (select b.studentno from

    (select score.studentno,score.final from score where score.courseno=@aa)as b join

    (select score.studentno,score.final from score where score.courseno=@bb)as c on b.studentno=c.studentno 

    and b.final>c.final)

    (7)查询所有班级期末平均成绩的最高分,并将其值赋给变量,通过PRINT语句输出。

    USE database1

    declare @aa float

    set @aa=(select max(rr.ww) from

     (

    select avg(qq.final) as ww

      from

         (select classno,final 

          from student  join score

          on student.studentno=score.studentno

         )as qq

      group by qq.classno)

     as rr)

    print CAST(@aa AS varchar(12))

    (8)查询至少选修了姓名为“韩吟秋”的学生所选修课程中一门课的学生的学号和姓名。

    USE database1

    select student.studentno,student.sname from student where student.studentno in(

    select score.studentno from score where score.courseno in

     (select score.courseno from score where 

       score.studentno=(select student.studentno from student where student.sname='韩吟秋')

     )and score.studentno!=(select student.studentno from student where student.sname='韩吟秋'))

    展开全文
  • 文章目录分类汇总查询数据聚合函数多连接查询交叉连接内连接外连接左外连接右外连接自连接 分类汇总查询数据 聚合函数 运行在行组上,计算和返回单个值的函数 Mysql中常见的聚合函数 ...例:查询a01学科的平均分
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