是否有可能使用單個更新語句更新包含多個條件的表值

Question

Table 

ID DESC 
1  Male 
2  Male 
3  Male 
4  Female 
5  Female 
6  Female 
7  Female 

我需要使用一個更新語句更新男性到女性和女性到男性。請對此建議。提前致謝。

Answer 1

對於SQL Server

update tbl 
SET DESC = CASE 
    WHEN DESC= 'Male' THEN 'Female' 
    WHEN DESC = 'Female' THEN 'Male' 
    ELSE DESC   
    END 

Answer 2

是的，你可以這樣做，使用情況下聲明

UPDATE TABLE 
SET DESC = CASE WHEN DESC = 'MALE' THEN 'Female' WHEN DESC = 'Female' THEN 'MALE' ELSE DESC END 

Answer 3

試試這個

UPDATE Table 
SET DESC = CASE 
    WHEN DESC= 'Male' THEN 'Female' 
    WHEN DESC = 'Female' THEN 'Male' 
    ELSE DESC   
    END 

出把儘可能遵循

ID DESC 

1  Female 
2  Female 
3  Female 
4  Male 
5  Male 
6  Male 
7  Male