MySQL seventh job - update data

1. Update all records in the teacher table , Change the allowance to 2000

update lingjinzhengteacher set
    -> comm = 2000
    -> ;

 

1.   Update the teacher number in the teacher table T5 To T8 Between the records , Change the allowance to 1500

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

2. 

 4 The number of class hours in the updated curriculum is not in 45,50 Records in , Change the number of class hours to 25

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

  The salary in the updated teacher table is not equal to 3000 And the allowance is not empty , Change the allowance to 1000

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

 

1. Update the salary in the teacher table equal to 2000 And the post allowance is greater than or equal to 1000 The record of , Change the allowance to 500

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

 

 

1. Update the course name in the course schedule with the letter “M” Start with... In the course name “L” A record of letters , Change the number of class hours to 78

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

 

 

1. Update the classroom in the lecture table Y building 2 Building records , Change the course number to C8, Change the teacher number to T10

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