MySQL第七次作业-更新数据

1.更新教师表中所有记录，将津贴改为2000

update lingjinzhengteacher set
    -> comm = 2000
    -> ;

 

1.  更新教师表中教师号在T5到T8之间的记录，将津贴改为1500

   mysql> update lingjinzhengteacher set
       -> comm = 1500
       -> where no between "t5" and "t8";

2. 

 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

mysql> update lingjinzheng_course set
    -> class_hours=25 where class_hours not in (45,50);

 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

mysql> update lingjinzhengteacher set
    -> comm = 1000 where sal != 3000 and comm is not null;

 

1. 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

mysql> update lingjinzhengteacher set
    -> comm = 500
    -> where sal = 2000 and comm >= 1000;

 

 

1. 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

mysql> update lingjinzheng_course set
    -> class_hours =78
    -> where name like "m%" and name like "%1%";

 

 

1. 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

mysql> update lingjinzheng_schoolteaching set
    -> course_no = "c8", teacher_no = "t10" where class_num like "y2%";