[征集] MySQL交叉表解决方案及散分,该如何解决

[征集] MySQL交叉表解决方案及散分

在某些数据库中有交叉表，但在MySQL中却没有这个功能，但网上看到有不少朋友想找出一个解决方法，特集思广义。无论对错皆有分。

数据样本：

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);

结果 (可不带行/列汇总)

BatchFile code

  +------+-----+-----+-----+-----+------+
|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   |
+------+-----+-----+-----+-----+------+

另外散分：

1。坚决不做地主富农

2。庆祝本月升三星

3。庆祝今年的第五朵红花

4。庆祝本月大版得分过万

感谢大版主的支持，感谢小版主的支持，感谢CSDN朋友的支持。

特地来学习的！

SQL code

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)



静态：
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




动态：
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;


帮楼主顶一下。学习了



  
   探讨
   
SQL codemysql>SELECT->IFNULL(c1,'total')AStotal,->SUM(IF(c2='B1',c3,0))ASB1,->SUM(IF(c2='B2',c3,0))ASB2,->SUM(IF(c2='B3',c3,0))ASB3,->SUM(IF(c2='B4',c3,0))ASB4,->SUM(IF(c2='total',c3,0))AStotal->FROM(->SELECTc1,IFNULL(c2,'total')ASc2,SUM(c3)ASc3->FROMtx->GROUPBYc1,c2->WITHROLLUP->HAVINGc1ISNOTNULL->)ASA->GROUPBYc1->WITHROLLUP;
   

   
"total","B1","B2","B3","B4","total"