日期:2014-05-16  浏览次数:20830 次

mysql行转化列 ?????
SQL code
col1  col2   col3     col4   
 a     a1     a2     1.2589
 a     a1     a2     2.2510
 a     a1     a2     5.2502
 a     a1     a2     1.0058
 a     a1     a2     6.2589
 b     a1     a2     7.2589
 b     a1     a2     3.1247
 b     a1     a2     1.3652
 b     a1     a2     2.2589
 b     a1     a2     1.2589
 c     a1     a2     1.7278
 c     a1     a2     2.4989
 c     a1     a2     1.2589
 c     a1     a2     3.1509
 c     a1     a2     1.2500
 d     a1     a2     4.2899
 d     a1     a2     1.2785
 d     a1     a2     5.2587
 d     a1     a2     1.2536
 d     a1     a2     1.2471

得到样式如下:

col2   col3     col4      col5     col6     col7  
 a1     a2     1.2589    7.2589   1.7278   4.2899
 a1     a2     2.2510    3.1247   2.4989   1.2785
 a1     a2     5.2502    1.3652   1.2589   5.2587
 a1     a2     1.0058    2.2589   3.1509   1.2536
 a1     a2     6.2589    1.2589   1.2500   1.2471


转化条件为Col1 列中的值,每个col1 中 都有固定五列相同的值 。


------解决方案--------------------
弄了一个很笨拙的,不好意思出手,还是先看看高手的办法吧。
------解决方案--------------------
http://nowtbin.iteye.com/blog/684126
------解决方案--------------------
SET @a='';
SET @b=1;
SELECT col2,col3,xh,
SUM(IF(bz=1,col4,0)),MAX(IF(bz=2,col4,0)),MAX(IF(bz=3,col4,0)),
SUM(IF(bz=4,col4,0))
FROM (
SELECT *,CEILING(id/5) AS bz,@b:=IF(@a=col1,@b+1,1) AS xh,@a:=col1 FROM ttw ORDER BY xh,col1,col2) a
GROUP BY col2,col3,xh
------解决方案--------------------
这样看来,我还算是没走错路~

SQL code
mysql> select * from coltest;
+------+------+------+---------+
| col1 | col2 | col3 | col4    |
+------+------+------+---------+
| a    | a1   | a2   | 1.25890 |
| a    | a1   | a2   | 2.25100 |
| a    | a1   | a2   | 5.25020 |
| a    | a1   | a2   | 1.00580 |
| a    | a1   | a2   | 6.25890 |
| b    | a1   | a2   | 7.25890 |
| b    | a1   | a2   | 3.12470 |
| b    | a1   | a2   | 1.36520 |
| b    | a1   | a2   | 2.25890 |
| b    | a1   | a2   | 1.25890 |
| c    | a1   | a2   | 1.72780 |
| c    | a1   | a2   | 2.49890 |
| c    | a1   | a2   | 1.25890 |
| c    | a1   | a2   | 3.15090 |
| c    | a1   | a2   | 1.25000 |
| d    | a1   | a2   | 4.28990 |
| d    | a1   | a2   | 1.27850 |
| d    | a1   | a2   | 5.25870 |
| d    | a1   | a2   | 1.25360 |
| d    | a1   | a2   | 1.24710 |
+------+------+------+---------+
20 rows in set (0.00 sec)

mysql> set @xxxx := "";
Query OK, 0 rows affected (0.00 sec)

mysql> set @xx := 0;
Query OK, 0 rows affected (0.00 sec)

mysql> select col2, col3, sum(col4), sum(col5), sum(col6), sum(col7)
    -> from
    -> (
    ->     select if(col1 = @xxxx, @xx:=@xx+1, @xx := 0) as xx, col1, col2, col3
, if(col1='a', col4, 0) as col4, if(col1='b', col4, 0) as col5, if(col1='c', col
4, 0) as col6, if(col1='d', col4, 0) as col7, @xxxx := col1
    ->     from coltest
    ->     order by col1
    -> ) as x
    -> group by x.col2, x.col3, x.xx
    -> ;
+------+------+-----------+-----------+-----------+-----------+
| col2 | col3 | sum(col4) | sum(col5) | sum(col6) | sum(col7) |
+------+------+-----------+-----------+-----------+-----------+
| a1   | a2   |   1.25890 |   1.25890 |   1.25000 |   4.28990 |
| a1   | a2   |   2.25100 |   2.25890 |   3.15090 |   1.27850 |
| a1   | a2   |   5.25020 |   1.36520 |   1.25890 |   5.25870 |
| a1   | a2   |   1.00580 |   3.12470 |   2.49890 |   1.25360 |
| a1   | a2   |   6.25890 |   7.25890 |   1.72780 |   1.24710 |
+------+------+-----------+-----------+-----------+-----------+
5 rows in set (0.00 sec)

mysql>

------解决方案--------------------