数据库第七次作业-更新数据

目录

​​1.更新教师表中所有记录，将津贴改为2000​​

​​2.更新教师表中教师号在T5到T8之间的记录，将津贴改为1500​​

​​3.更新授课表中周数为8的记录，将教师号改为T7，课程号改为C1​​

​​4.更新课程表中课时数不在45，50中的记录，将课时数改为25​​

​​5.更新教师表中工资不等于3000并且津贴不为空的记录，将津贴改为1000​​

​​6.更新授课表中教室号在J102，Y104，Y303，J301中的记录，将周数改为14，课程号改为C5​​

​​7.更新教师表中工资等于2000并且岗位津贴大于等于1000的记录，将津贴改为500​​

​​8.更新课程表中带课程名称以字母“M”开头并且课程名称中有“L”字母的记录，将课时数改为78​​

​​9.更新授课表中教室在Y栋2楼的记录，将课程号改为C8，教师号改为T10​​

1.更新教师表中所有记录，将津贴改为2000

update teacher set comm=2000;

2.更新教师表中教师号在T5到T8之间的记录，将津贴改为1500

update teacher set comm=1500 where no between "T5" and "T8";

3.更新授课表中周数为8的记录，将教师号改为T7，课程号改为C1

update schoolteaching set teacher_no = "T7",course_no = "C1" where week=8;

4.更新课程表中课时数不在45，50中的记录，将课时数改为25

update course set

    -> class_hours=25 where

    -> class_hours not in (45,50);

5.更新教师表中工资不等于3000并且津贴不为空的记录，将津贴改为1000

update teacher set

    -> comm=1000

    -> where sal!=3000 and comm is not null;

6.更新授课表中教室号在J102，Y104，Y303，J301中的记录，将周数改为14，课程号改为C5

update schoolteaching set

    -> week =14,course_no = "C5"

    -> where class_num in ("J102","Y104","Y303","J301");

7.更新教师表中工资等于2000并且岗位津贴大于等于1000的记录，将津贴改为500

update teacher set

    -> comm=500 where

    -> sal=2000 and comm>=1000;

8.更新课程表中带课程名称以字母“M”开头并且课程名称中有“L”字母的记录，将课时数改为78

update course set

    -> class_hours=78 where

    -> name like "M%" and name like "%l%";

9.更新授课表中教室在Y栋2楼的记录，将课程号改为C8，教师号改为T10

update schoolteaching set

    -> course_no = "C8",teacher_no = "T10"

    -> where class_num like "Y2%";