我的SQL的情况下当不上第二列

Question

返回值它只返回EIA的价值，而不是EIA 2

(
    case 
    when tc.name = 'EIA' then tor.value else null 
    end 
) as EIA, 
(
    case 
    when tc.name = 'EIA 2' then tor.value else null 
    end 
) as EIA2 

这是此表结构来执行的Tor

测试值 EIA环评2阳性，正

ID Name EIA  EIA 2 
1 John POSITIVE no values?? 

Answer 1

试试这个：

(
    CASE 
    WHEN tc.name IS NULL THEN '' WHEN tc.name = 'EIA' THEN tor.value 
    END 
) as EIA, 
(
    CASE 
    WHEN tc.name IS NULL THEN '' WHEN tc.name = 'EIA 2' THEN tor.value 
    END 
) as EIA2 

Answer 2

(CASE 
     WHEN tc.name = 'EIA' THEN tor.value 
     WHEN tc.name = 'EIA 2' THEN tor.value 
     ELSE NULL 
    END) 

OR

(CASE 
     WHEN tc.name = 'EIA' THEN tor.value 
END) as EIA, 
(CASE WHEN tc.name = 'EIA 2' THEN tor.value 
    END) as EIA2