我的SQL情況下，第二列上未返回值

Question

它僅返回EIA的值，而不返回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

這是這個表結構

測試執行的Tor值EIA，EIA 2正，正

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

Answer 1

嘗試這個：

(
  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)

要么

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