mysql行列轉換方法總結

轉 http://bbs.csdn.net/topics/310045927 在某些數據庫中有交叉表，但在MySQL中卻沒有這個功能，但網上看到有不少朋友想找出一個解決方法，特集思廣義。無論對錯皆有分。 數據樣本： createtabletx( idintprimarykey, c1char(2), c2char(2), c3int ); inser



轉 http://bbs.csdn.net/topics/310045927

在某些數據庫中有交叉表，但在MySQL中卻沒有這個功能，但網上看到有不少朋友想找出一個解決方法，特集思廣義。無論對錯皆有分。

數據樣本：
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);

結果 (可不帶行/列匯總)
[code=BatchFile]+------+-----+-----+-----+-----+------+
|C1 |B1 |B2 |B3 |B4 |Total |
+------+-----+-----+-----+-----+------+
|A1 |9 |2 |1 |11 |23 |
|A2 |7 |9 |8 |7 |31 |
|A3 |4 |8 |8 |8 |28 |
|A4 |2 |5 |6 |14 |27 |
|Total |22 |24 |23 |40 |109 |
+------+-----+-----+-----+-----+------+[/code]

方法一：

mysql> 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
-> GROUP BY c1
-> WITH ROLLUP;

"total","B1","B2","B3","B4","total"
"A1",9,2,1,11,23
"A2",7,9,8,7,31
"A3",4,8,8,8,28
"A4",2,5,6,14,27
"total",22,24,23,40,109

5 rows in set, 1 warning (0.00 sec)

方法二：

靜態：
select c1,
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(C3) AS TOTAL
from tx
group by C1
UNION
SELECT '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(C3) FROM TX

方法三：

動態：
SET @EE='';
SELECT @EE:=CONCAT(@EE,'SUM(IF(C2=\'',C2,'\'',',C3,0)) AS ',C2,',') FROM
(SELECT DISTINCT C2 FROM TX) A;
SET @QQ=CONCAT('SELECT ifnull(c1,\'total\'),',LEFT(@EE,LENGTH(@EE)-1),' ,SUM(C3) AS TOTAL FROM TX GROUP BY C1 WITH ROLLUP');
PREPARE stmt2 FROM @QQ;
EXECUTE stmt2;

方法四：

--木有合計,在SQL Server下測試通過

if object_id('tempdb..#tx') is not null drop table #tx
go
create table #tx(
id int primary key,
c1 char(2),
c2 char(2),
c3 int
);

insert into #tx (id,c1,c2,c3) values (1 ,'A1','B1',9)
insert into #tx (id,c1,c2,c3) values (2 ,'A2','B1',7)
insert into #tx (id,c1,c2,c3) values (3 ,'A3','B1',4)
insert into #tx (id,c1,c2,c3) values (4 ,'A4','B1',2)
insert into #tx (id,c1,c2,c3) values (5 ,'A1','B2',2)
insert into #tx (id,c1,c2,c3) values (6 ,'A2','B2',9)
insert into #tx (id,c1,c2,c3) values (7 ,'A3','B2',8)
insert into #tx (id,c1,c2,c3) values (8 ,'A4','B2',5)
insert into #tx (id,c1,c2,c3) values (9 ,'A1','B3',1)
insert into #tx (id,c1,c2,c3) values (10 ,'A2','B3',8)
insert into #tx (id,c1,c2,c3) values (11 ,'A3','B3',8)
insert into #tx (id,c1,c2,c3) values (12 ,'A4','B3',6)
insert into #tx (id,c1,c2,c3) values (13 ,'A1','B4',8)
insert into #tx (id,c1,c2,c3) values (14 ,'A2','B4',2)
insert into #tx (id,c1,c2,c3) values (15 ,'A3','B4',6)
insert into #tx (id,c1,c2,c3) values (16 ,'A4','B4',9)
insert into #tx (id,c1,c2,c3) values (17 ,'A1','B4',3)
insert into #tx (id,c1,c2,c3) values (18 ,'A2','B4',5)
insert into #tx (id,c1,c2,c3) values (19 ,'A3','B4',2)
insert into #tx (id,c1,c2,c3) values (20 ,'A4','B4',5)

SELECT c1
,sum(CASE
WHEN c2='B1' THEN c3
ELSE 0
END) AS [b1]
,sum(CASE
WHEN c2='B2' THEN c3
ELSE 0
END) AS [b2]
,sum(CASE
WHEN c2='B3' THEN c3
ELSE 0
END) AS [b3]
,sum(CASE
WHEN c2='B4' THEN c3
ELSE 0
END) AS [b4]
FROM #tx
GROUP BY c1

方法五：

--動態的話

if object_id('tempdb..#tx') is not null drop table #tx
go
create table #tx(
id int primary key,
c1 char(2),
c2 char(2),
c3 int
);

insert into #tx (id,c1,c2,c3) values (1 ,'A1','B1',9)
insert into #tx (id,c1,c2,c3) values (2 ,'A2','B1',7)
insert into #tx (id,c1,c2,c3) values (3 ,'A3','B1',4)
insert into #tx (id,c1,c2,c3) values (4 ,'A4','B1',2)
insert into #tx (id,c1,c2,c3) values (5 ,'A1','B2',2)
insert into #tx (id,c1,c2,c3) values (6 ,'A2','B2',9)
insert into #tx (id,c1,c2,c3) values (7 ,'A3','B2',8)
insert into #tx (id,c1,c2,c3) values (8 ,'A4','B2',5)
insert into #tx (id,c1,c2,c3) values (9 ,'A1','B3',1)
insert into #tx (id,c1,c2,c3) values (10 ,'A2','B3',8)
insert into #tx (id,c1,c2,c3) values (11 ,'A3','B3',8)
insert into #tx (id,c1,c2,c3) values (12 ,'A4','B3',6)
insert into #tx (id,c1,c2,c3) values (13 ,'A1','B4',8)
insert into #tx (id,c1,c2,c3) values (14 ,'A2','B4',2)
insert into #tx (id,c1,c2,c3) values (15 ,'A3','B4',6)
insert into #tx (id,c1,c2,c3) values (16 ,'A4','B4',9)
insert into #tx (id,c1,c2,c3) values (17 ,'A1','B4',3)
insert into #tx (id,c1,c2,c3) values (18 ,'A2','B4',5)
insert into #tx (id,c1,c2,c3) values (19 ,'A3','B4',2)
insert into #tx (id,c1,c2,c3) values (20 ,'A4','B4',5)

select * from #tx

declare @sql varchar(8000)
set @sql='select c1,'
select @sql=@sql+'sum(case when c2='''+cast(c2 as varchar(10))+''' then c3 else 0 end)['+cast(c2 as varchar(10))+'],'
from (select distinct c2 from #tx ) a
print(@sql)

set @sql=left(@sql,len(@sql)-1)+' from #tx group by c1'
exec(@sql)
if object_id('tempdb..#tx') is not null drop table #tx

/*
A1 9 2 1 11
A2 7 9 8 7
A3 4 8 8 8
A4 2 5 6 14
*/

測試

1、

mysql> 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
-> GROUP BY c1
-> WITH ROLLUP;
+-------+------+------+------+------+-------+
| total | B1 | B2 | B3 | B4 | total |
+-------+------+------+------+------+-------+
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| total | 22 | 24 | 23 | 40 | 109 |
+-------+------+------+------+------+-------+
5 rows in set, 1 warning (0.00 sec)

2、

mysql> select c1,
-> 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(C3) AS TOTAL
-> from tx
-> group by C1
-> UNION
-> SELECT '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(C3) FROM TX
-> ;
+-------+------+------+------+------+-------+
| c1 | B1 | B2 | B3 | B4 | TOTAL |
+-------+------+------+------+------+-------+
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| TOTAL | 22 | 24 | 23 | 40 | 109 |
+-------+------+------+------+------+-------+
5 rows in set (0.00 sec)

mysql>

3、

mysql> select ifnull(c1,'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(C3) AS TOTAL
-> from tx
-> group by C1 with rollup ;
+--------------------+------+------+------+------+-------+
| ifnull(c1,'total') | B1 | B2 | B3 | B4 | TOTAL |
+--------------------+------+------+------+------+-------+
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| total | 22 | 24 | 23 | 40 | 109 |
+--------------------+------+------+------+------+-------+
5 rows in set (0.00 sec)

mysql>

4、
mysql> SET @EE='';
mysql> SELECT @EE:=CONCAT(@EE,'SUM(IF(C2=\'',C2,'\'',',C3,0)) AS ',C2,',') FROM (SELECT DISTINCT C2 FROM TX) A;

mysql> SET @QQ=CONCAT('SELECT ifnull(c1,\'total\'),',LEFT(@EE,LENGTH(@EE)-1),' ,SUM(C3) AS TOTAL FROM TX GROUP BY C1 WITH ROLLUP');
Query OK, 0 rows affected (0.00 sec)

mysql> PREPARE stmt2 FROM @QQ;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

mysql> EXECUTE stmt2;
+--------------------+------+------+------+------+-------+
| ifnull(c1,'total') | B1 | B2 | B3 | B4 | TOTAL |
+--------------------+------+------+------+------+-------+
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| total | 22 | 24 | 23 | 40 | 109 |
+--------------------+------+------+------+------+-------+
5 rows in set (0.00 sec)

mysql>

5、

mysql> SET @EE='';
mysql> SELECT @EE:=CONCAT(@EE,'SUM(IF(C2=\'',C2,'\'',',C3,0)) AS ',C2,',') FROM (SELECT DISTINCT C2 FROM TX) A;

mysql> SET @QQ=CONCAT('SELECT ifnull(c1,\'total\'),',LEFT(@EE,LENGTH(@EE)-1),' ,SUM(C3) AS TOTAL FROM TX GROUP BY C1 WITH ROLLUP');
Query OK, 0 rows affected (0.00 sec)

mysql> PREPARE stmt2 FROM @QQ;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

mysql> EXECUTE stmt2;
+--------------------+------+------+------+------+-------+
| ifnull(c1,'total') | B1 | B2 | B3 | B4 | TOTAL |
+--------------------+------+------+------+------+-------+
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| total | 22 | 24 | 23 | 40 | 109 |
+--------------------+------+------+------+------+-------+
5 rows in set (0.00 sec)

mysql>

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