關於非規範化。我怎樣才能使這個查詢更短或更好？ （SQL SERVER 2000）

Question

INSERT INTO 
denormalizedTable 

SELECT 
table1.userName, 
MAX(CASE WHEN table2.Type = 1 THEN table2.Question END) AS question_1, 
MAX(CASE WHEN table2.Type = 1 THEN table2.Answer END) AS answer_1, 
MAX(CASE WHEN table2.Type = 2 THEN table2.Question END) AS question_2, 
MAX(CASE WHEN table2.Type = 2 THEN table2.Answer END) AS answer_2, 
MAX(CASE WHEN table2.Type = 3 THEN table2.Question END) AS question_3, 
MAX(CASE WHEN table2.Type = 3 THEN table2.Answer END) AS answer_3, 
MAX(CASE WHEN table2.Type = 4 THEN table2.Question END) AS question_4, 
MAX(CASE WHEN table2.Type = 4 THEN table2.Answer END) AS answer_4, 
MAX(CASE WHEN table2.Type = 5 THEN table2.Question END) AS question_5, 
MAX(CASE WHEN table2.Type = 5 THEN table2.Answer END) AS answer_5, 
MAX(CASE WHEN table2.Type = 6 THEN table2.Question END) AS question_6, 
MAX(CASE WHEN table2.Type = 6 THEN table2.Answer END) AS answer_6, 
MAX(CASE WHEN table2.Type = 7 THEN table2.Question END) AS question_7, 
MAX(CASE WHEN table2.Type = 7 THEN table2.Answer END) AS answer_7, 
MAX(CASE WHEN table2.Type = 8 THEN table2.Question END) AS question_8, 
MAX(CASE WHEN table2.Type = 8 THEN table2.Answer END) AS answer_8 

FROM 
table1 
JOIN 
table2 
ON 
table1.userID = table2.userID 

GROUP BY table1.userName 

Answer 1

您正在SQL中執行'PIVOT'操作。沒有真正的更好的辦法，所以你不能真正做得更好。

也許你可以GROUP BY table1.userID而不是userName！

問題是：爲什麼你需要這樣的查詢？

如果你正在做的查詢的信息查看客戶端返回的結果，然後轉動操作時一定要查看的工作，而不是DAL。

我們需要更多的上下文來回答您！