如何在單個sql查詢中使用條件更新多列

Question

我想用多個條件更新多列。例如

update student set name='john' where id=10 
update student set name='doe' where id=5 

如何在單個語句中更新此內容？

Answer 1

使用CASE WHEN

update student 
set name= CASE WHEN id = 5 THEN 'john' 
       WHEN id = 10 THEN 'doe' 
       ELSE name 
      END 
where id in (
    5, 10 
) 

Answer 2

update tablename 
set coloumn_name1= CASE WHEN coloumn_name = 5 THEN 'john' 
       WHEN coloumn_name = 10 THEN 'doe' 
       ELSE name 
      END 
where coloumn_name in (
    5, 10 
)