如果將行選擇爲多列

Question

您好，我正在尋求幫助，我的查詢當前運行沒有錯誤，但不顯示數據，因爲我也需要它。我的表存儲電話號碼，相關字段是id，phonetype和phonenumber。

運行時，雖然它只顯示最後一個數字，但它會按預期方式返回列id,HOME PHONE,WORK PHONE,CELL PHONE。假設在給定行中有家庭電話和工作電話號碼...我只在該工作電話的WORK PHONE列中獲取數據。如果連續存在家庭電話，工作電話和手機...我只能在CELL PHONE列中獲取數據。

我需要在phonetype類型的唯一列中給定id的所有電子形式的一行。我希望是有道理的，如果沒有查詢應該給你一個想法是什麼即時尋找...感謝

SELECT id, 
(IF(phonetype = 'HOME PHONE', phonenumbers.phonenumber, '')) AS 'HOME PHONE', 
(IF(phonetype = 'WORK PHONE', phonenumbers.phonenumber, '')) AS 'WORK PHONE', 
(IF(phonetype = 'CELL PHONE', phonenumbers.phonenumber, '')) AS 'CELL PHONE' 
FROM phonenumbers 
GROUP BY id; 

表我查詢看起來像這樣

id | name | phonetype | phonenumber 

1 | Jim | HOME PHONE | 0000000001   
1 | Jim | WORK PHONE | 0000000002 
2 | Kim | HOME PHONE | 0000000003 
2 | Kim | WORK PHONE | 0000000004 
2 | Kim | CELL PHONE | 0000000005 

結果我我想找應該是這樣的......

id | name | home phone | work phone | cell phone 

1 | Jim | 0000000001 | 0000000002 | 
2 | Kim | 0000000003 | 0000000004 | 0000000005 

Answer 1

假定每個ID都有反對每種類型的只有一個電話號碼：

SELECT a.id, 
(SELECT phonenumbers.phonenumber FROM phonenumbers WHERE phonetype = 'HOME PHONE' AND id = a.id) AS 'HOME PHONE', 
(SELECT phonenumbers.phonenumber FROM phonenumbers WHERE phonetype = 'WORK PHONE' AND id = a.id) AS 'WORK PHONE', 
(SELECT phonenumbers.phonenumber FROM phonenumbers WHERE phonetype = 'CELL PHONE' AND id = a.id) AS 'CELL PHONE' 
FROM phonenumbers a 
GROUP BY a.id; 

可能會有所幫助。 乾杯。