SQL 行列置換

create table tx(
 id int primary key,
 c1 char(2),
 c2 char(2),
 c3 int
);

insert into tx values
(1 ,'A1','B1',9),
(2 ,'A2','B1',7),
(3 ,'A3','B1',4),
(4 ,'A4','B1',2),
(5 ,'A1','B2',2),
(6 ,'A2','B2',9),
(7 ,'A3','B2',8),
(8 ,'A4','B2',5),
(9 ,'A1','B3',1),
(10 ,'A2','B3',8),
(11 ,'A3','B3',8),
(12 ,'A4','B3',6),
(13 ,'A1','B4',8),
(14 ,'A2','B4',2),
(15 ,'A3','B4',6),
(16 ,'A4','B4',9),
(17 ,'A1','B4',3),
(18 ,'A2','B4',5),
(19 ,'A3','B4',2),
(20 ,'A4','B4',5); 

SELECT
         IFNULL(c1,'total') AS total,
         SUM(IF(c2='B1',c3,0)) AS B1,
         SUM(IF(c2='B2',c3,0)) AS B2,
         SUM(IF(c2='B3',c3,0)) AS B3,
         SUM(IF(c2='B4',c3,0)) AS B4,
         SUM(IF(c2='total',c3,0)) AS total
FROM
(
         SELECT c1,IFNULL(c2,'total') AS c2,SUM(c3) AS c3
         FROM tx
         GROUP BY c1,c2
         WITH ROLLUP
         HAVING c1 IS NOT NULL
     ) AS A ,
tx
GROUP BY c1
     WITH ROLLUP