数据库第五次作业-查询数据

1. 1. 查询教师表中教师号在T5到T10之间的所有字段数据：

      select * from huang_le_xiang where no between "T10" and "T5";

      
   2. 查询授课表中 周数为14 的 课程号、教师号、周数、教室号 字段数据

      select * from school_teaching_huanglexiang where week=14;

      
   3. 查询授课表中去重后的所有教师号

      select distinct teacher_no from school_teaching_huanglexiang;

      
   4. 查询授课表中教室在J栋的所有字段数据，取2-3条

      select * from school_teaching_huanglexiang where class_num like "j%" limit 1,2;

   5. 查询课程表中课时数在45，30，50中的所有字段数据

      select * from course_huanglexiang where class_hours in("45","30","50");

      
   6. 查看教师表中工资不等于3000的 姓名、工资、岗位津贴 字段数据

      select name,prof,sal,comm from huang_le_xiang where sal!="3000";

      
   7. 查询教师表中岗位津贴小于1500的 姓名、职称、工资、岗位津贴 字段数据

      select * from huang_le_xiang where comm<"1500";

      
   8. 查询教师表中岗位津贴为空的所有字段数据，按工资从小到大排序

      select * from huang_le_xiang where comm is null order by sal asc;

      
   9. 查询课程表中课程号在C3到C7之间的所有字段数据，按课时数从大到小排序

      select * from course_huanglexiang where no between "C3" and "C7" order by class_hours desc;

   10. 查询授课表中教室在Y栋2楼的 课程号、教师号、教室号 字段数据，取第一条

       select course_no,teacher_no,class_num from school_teaching_huanglexiang where class_num like "Y2%" limit 1;

       
   11. 查询教师表中 工资为2000 的 教师号、职称、工资 字段数据

       select name,prof,sal from huang_le_xiang where sal="2000";

       
   12. 查询教师表中去重后的所有职称

       select distinct prof from huang_le_xiang;

       
   13. 查询授课表中教室号在J102，Y104，Y303，J301中的所有字段数据

       select * from school_teaching_huanglexiang where class_num in ("J102","Y104","Y303","J301");

       
   14. 查看课程表中课时数不等于45的 课程号、课程名、周数 字段数据，按周数从小到大排序，取前两条。

       select no,name,class_hours from course_huanglexiang where class_hours!=45 order by class_hours limit 2;

       
   15. 查询授课表中周数大于等于50的 课程号、教师号 字段数据

       select course_no,teacher_no from school_teaching_huanglexiang where week>=50;

       
   16. 查询课程表中课程名称以字母“M”开头并且课程名称中有“L”字母的所有字段数据

       select * from course_huanglexiang where name like "m%l%";