mysql if else multiple conditions

MySQL How to use a statement to achieve judgment similar to if-else conditional statements

1. Write an update statement to achieve product price increase. The specific rules are as follows

1. Within 99 yuan, the price will be increased by 20%

2. Between 100-999 yuan, the price will be increased by 10%

3. Between 1000-1999 During the period, the price will be increased by 5%

4, and other prices will be increased by 2%

update goods  
set price = (  
case   
  when price between 0 and 99 then price * 1.2  
  when price between 100 and 999 then price * 1.1  
  when price between 1000 and 1999 then price * 1.05  
  when price > 1999 then price * 1.02  
end);  
select * from goods;

2. Write a select statement to achieve the following effect

 学号   姓名 分数 等级
-------------------------------------------------
 1       张三   86   良好
 2       李四   98   优秀
 3       王五   72   及格
 4       那六   69   及格
 5       小幺   56   不及格

Rules As follows:

1, >=90: Excellent

2, >=80: Good

3, >=60: Pass

4. <60: Failed

select id as 学号, name as 姓名, score as 分数,   
(  
  case   
    when score >= 90 then '优秀'  
    when score >= 80 and score < 90 then '良好'  
    when score >= 60 and score < 80 then '及格'  
    when score < 60 then '不及格'  
  end  
)  
as 等级  
from scores;
The above is the detailed content of mysql if else multiple conditions. For more information, please follow other related articles on the PHP Chinese website!