SQL查詢case語句

Question

我有一個SQL查詢，這是生成表

SELECT DISTINCT 
concat(table.column, '.test.com) "User Login", 
concat(concat(table.columnname, ' '), lastname) "Full Name", 
'N' "Admin (Y/N)", 
table.profile "Profile", 
'Self' "admin", 
'Self' "user", 
FROM table.users 

我想一個case語句添加到上述查詢。

If (table.profile == admin){ 
admin = self; 
user = null; 
} 
else{ 
admin = null; 
user = self; 
} 

任何人都可以幫忙嗎？

Answer 1

select ... 
,  case when profile = 'admin' then 'self' end as admin 
,  case when coalesce(profile,'') <> 'admin' then 'self' end as user 
from table.users 

case的默認值爲空，它符合您的要求。