在sql查询中有条件地选择

Question

I am trying to access a field from a table and give different output based on the field content.
If the field has 0 I want to fetch No else if 1 or NULL I want to fetch yes .
It is working well for 0 or 1 but not for NULL .

Select  distinct(convert(varchar(255),( CASE Field1
                                         WHEN 0 
                                             THEN 'No'
                                         WHEN 1
                                             THEN 'Yes'
                                         WHEN NULL 
                                             THEN 'Yes' 
                                       END ))) AS Field1 FROM Table1

Answer 1

CASE Field1
WHEN 0 THEN 'No'              
ELSE 'Yes'
END

or this:

CASE ISNULL(Field1, 1)
WHEN 0 THEN 'No'              
WHEN 1 THEN 'Yes'
END

Answer 2

     Select  distinct(convert(varchar(255),
     (CASE Field1 WHEN 0 THEN 'No'
      WHEN 1 THEN 'Yes'              
      WHEN IS NULL THEN 'Yes'
     END))) as Field1 from Table1

Answer 3

SELECT ISNULL(CASE Field1 WHEN 0 THEN 'No' WHEN 1 THEN 'Yes','Yes') AS ..

Answer 4

Select  distinct(convert(varchar(255),( CASE Field1
     WHEN 0 THEN               
    'No'              
     else 'Yes'  END )))as Field1 from Table1

Answer 5

Select  distinct(convert(varchar(255),
    CASE ISNULL(FIELD1, 1)
        WHEN 0 THEN 'No'              
        WHEN 1 THEN 'Yes'                        
    END 
        ))as FIELD1 
        from TABLE1

Answer 6

May be you want this:

 Select  distinct(convert(varchar(255),( CASE 

     WHEN Field1 =0 THEN               
    'No'              
WHEN Field1=1  THEN              
    'Yes'              
     WHEN Field1 is null THEN 'Yes'              
END )))as Field1 from Table1