Question

假设2013年的物品A销售量是100件数量，我预计明年即2014年销售额增长10％

--------------------
 ITEM | YEAR | QTY | 
--------------------
 ITM-A| 2013 | 100 |
 ITM-B| 2013 | 200 |
--------------------

如果我想预测截至2015年的销售数据

------------------------------
   Item | 2013 | 2014 | 2015 | 
------------------------------ 
 Item-A | 100  | 110  | 121  |--each year qty incremented by 10% of its
 Item-B | 200  | 220  | 242  |--previous year qty
------------------------------

Answer 1

试试这个：

select item, 
       qty as '2013',
       round(qty*1.1) as '2014', 
       round(qty*1.21) as '2015' 
from sale;

使用存储过程的动态查询

DELIMITER $$
create procedure p (IN end INT(10))
BEGIN
    declare start int;
    declare fact FLOAT;
    SET fact = 1.1;
    SELECT year into start FROM sale limit 1;
    SET @QUERY1 = CONCAT("SELECT ITEM, QTY AS '",start,"'"); 
    WHILE start < end DO
    SET start = start + 1;
        SET @QUERY1 = CONCAT(@QUERY1," ,qty*",fact," as '", start,"'");
        SET fact = fact *1.1; 
    END WHILE;
    SET @QUERY1 = CONCAT(@QUERY1," from sale");
    PREPARE stmt FROM @QUERY1;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
END $$      

DELIMITER ;

输出：

mysql> call p(2016);
+-------+------+-------+--------+---------+
| ITEM  | 2013 | 2014  | 2015   | 2016    |
+-------+------+-------+--------+---------+
| itemA |  100 | 110.0 | 121.00 | 133.100 |
| itemB |  200 | 220.0 | 242.00 | 266.200 |
+-------+------+-------+--------+---------+
2 rows in set (0.00 sec)

Answer 2

试试这个，你必须使用动态sql

Declare @toyear int=2016
Declare @forcast int=10
Declare @t table (ITEM varchar(50), years int, qty int)
insert into @t
select 'TM-A' ITEM , 2013 years, 100 qty
union all
select 'TM-B' ITEM , 2013 years, 200 qty

;with CTE1 as
(
select * from @t
union all
select b.ITEM,b.years+1,b.qty+((@forcast*b.qty)/100) from @t a 
inner join cte1 b on a.ITEM=b.ITEM 
and b.years<@toyear
)
    select * from
(select  * from cte1 )t4
pivot(min(qty) for years in([2013],[2014],[2015],[2016]))pvt

Answer 3

检查此问题：

Pass a function return to another in the same row

你的功能只是乘以1.1

如何从行到列显示预测年数据？

3 个答案: