如何使用PIVOT子句在空白值

的樣本數據：如何使用PIVOT子句在空白值

Data table1: 
prodid type location(there are more columns, just ignoring them for this example) 
p001  t1  l1 
p002  t1  l2 
p003  t3  l1 
p004  t2  
p005  t1  l1 

Need a summary like 
type Blank [l1] [l2] 
t1  0   2   1 
t2  1   0   0 
t3  0   1   0

問題現在面臨是在位置字段中的空白值。我不知道如何表示數據透視查詢中的空白位置值。

Pivot query: 
1: select type, [] as Blank, [l1], [l2], Blank + [l1] + [l2] as Total from 
2: (select type, location from table1) 
3: pivot 
4: (count(location) for location in ([],[l1],[l2]) t2 

Error on line 1 & 4 
An object or column name is missing or empty. For SELECT INTO statements, verify each column has a name. For other statements, look for empty alias names. Aliases defined as "" or [] are not allowed. Add a name or single space as the alias name.

來源

2011-10-12 user981785

如何只換出空/空位置爲空值。因此，改變

select type, location from table1

到

select type, CASE WHEN location is null THEN 'ZZ' ELSE location END as location from table1

則列將是ZZ或任何虛擬價值選擇

來源

2011-10-12 10:31:31 PeteT

我把CASE，因爲我不知道你的位置是空字符串還是真正爲空。如果它們爲空，你可以使用isnull（location，'zz'），我認爲這應該更有效一些。雖然如果你沒有大量的數據，你不會注意到。 – PeteT

你可以只放棄PIVOT和使用

SELECT type, 
     COUNT(CASE 
       WHEN location = '' THEN 1 
      END) AS Blank, 
     COUNT(CASE 
       WHEN location = 'l1' THEN 1 
      END) AS l1, 
     COUNT(CASE 
       WHEN location = 'l2' THEN 1 
      END) AS l2, 
     COUNT(*) AS Total 
FROM table1 
WHERE location in ('','l1','l2') 
GROUP BY type

來源

2011-10-12 09:49:22

感謝您的快速反應馬丁。 Acutal表具有更多位置值，並且可以更改。當我知道如何處理空白值時，我打算構建一些程序結構以獲取唯一列表，並準備數據透視表並運行以使其具有動態性。我可以對建議的查詢做同樣的事情，但可能會變得冗長。有什麼想法嗎？ – user981785

如何使用PIVOT子句在空白值

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