Mysql的轉換表從長格式的寬幅

Question

我有一個MySQL表是這樣的：

而且我想它從長格式轉換爲寬幅這樣

對不起。我是新的，不知道如何發佈表

Answer 1

試試這個：

insert into goodTable 
select 
bt.id, 
(select bt1.value from badTable bt1 where bt1.info = 'firstname' and bt1.id = bt.id), 
(select bt1.value from badTable bt1 where bt1.info = 'lastname' and bt1.id = bt.id), 
(select bt1.value from badTable bt1 where bt1.info = 'phone' and bt1.id = bt.id) 
from 
badTable bt 
group by id ; 

這裏的工作小提琴：http://sqlfiddle.com/#!2/45f29e/2

Answer 2

你需要的東西是這樣的：

select id, 
     max(case when info='firstname' then value else null end), 
     max(case when info='lastname' then value else null end), 
     ... 
    from table 
    group by id; 

Answer 3

試試這個：

SELECT P.`info`, 
     (CASE 
      WHEN P.`action`='fname' AND P.`id` = '1'OR'2' 
      THEN P.`id` 
      ELSE NULL 
     END)AS 'firstname', 

     (CASE 
      WHEN P.`action`='lname' AND P.`id` = '2' OR'2' 
      THEN P.`id` 
      ELSE NULL 
     END) AS 'lastname', 

     (CASE 
      WHEN P.`action`='phone' AND P.`id` = '1'OR'2' 
      THEN P.`id` 
      ELSE NULL 
     END) AS 'phone' 
FROM tablename P 
GROUP BY P.`info`;