Question

我有这张桌子。我需要一个查询的帮助，该查询仅显示在9月购买了东西但在10月份没有购买任何东西的客户ID。

customer_id     purchase_item       qty     purchase_date
-----------     -------------       ---     -------------
  5415151       desk organizer       1      9/5/2015
  5415151       desk lamp            1      9/5/2015
  7884195       pen holder           8      9/7/2015
  7894152       flash drive          10     9/19/2015
  5987412       universal charger    2      9/28/2015
  1264879       desk fan             20     10/7/2015
  5415151       filing cabinet       5      10/10/2015
  7894152       flash drive          5      10/10/2015

......这就是我想要看到的：

  user_id     
  -------    
  7894152     
  5987412

Answer 1

SELECT T1.customer_id
FROM customer_table T1
   LEFT JOIN customer_table T2 ON T1.customer_id = T2.customer_id AND 
    MONTH(STR_TO_DATE(T1.purchase_date, '%m/%d/%Y')) = 9 AND
    MONTH(STR_TO_DATE(T2.purchase_date, '%m/%d/%Y')) = 10
WHERE T2.customer_id IS NULL AND MONTH(STR_TO_DATE(T1.purchase_date, '%m/%d/%Y')) = 9

尝试DEMO SQLFiddle，它会起作用。

希望这有帮助

Answer 2

尝试这样的查询： -

SELECT customer_id,
group_concat(month((str_to_date(purchase_date,'%m/%d/%y')))) as date1
FROM `customer` group by customer_id 
HAVING FIND_IN_SET('9',date1) >0 and FIND_IN_SET('10',date1) =0

Try demo

9月买了东西，但10月没买东西

2 个答案: