根据条件进行计数和排除

Question

基本上，我在一个表中（仅前25行）具有以下内容，并且可以通过执行此简单查询来获得它。

select * from SampleDidYouBuy
order by MemberID, SampleID, DidYouBuy

SampleDidYouBuyID   SampleID    MemberID    DidYouBuy   DateAdded
-----------------------------------------------------------------
1217                23185       5           1           35:27.9
58458               23184       22          0           47:15.4
58459               23184       22          1           47:36.8
58457               23203       22          1           47:12.6
299576              23257       22          1           33:38.4
59470               23182       23          0           36:22.1
97656               23183       24          1           53:46.5
97677               23214       24          0           53:59.6
212732              23214       24          0           42:53.3
226583              23245       24          1           28:29.6
191718              23184       27          0           00:19.4
156363              23184       27          0           09:45.6
121106              23184       27          0           50:57.0
156362              23224       27          0           09:42.8
191716              23224       27          0           00:17.7
191715              23235       27          1           00:15.2
318100              23254       27          0           24:36.6
335410              23254       27          0           57:33.2
335409              23259       27          0           57:31.9
318099              23259       27          0           24:34.5
118989              23184       32          0           55:03.6
119013              23184       32          0           56:57.4
119842              23183       34          1           38:12.6
129364              23181       40          0           23:59.7
139977              23181       40          0           04:08.8

我想做的事是对每个会员ID的Yes进行计数，我已经知道该怎么做DidYouBuy ='1'但是我也想做的是计算No's的数目，这有点棘手'DidYouBuy = 0'

如您在上表中所见，对于相同的memberID和Sample ID（这是他们正在营销的样品的ID），存在多个“否”条目，这是因为每次有人在网站上选择“否”时，问题仍然存在，并且每次单击“否”都会为该示例注册。 但是，当他们单击“是”时，该问题消失，并且不再有该特定成员的该样本的“否”注册。

我想计算尚未转换为“是”的唯一编号的数量。 我知道这听起来很混乱，所以当您有时间给我们大喊时，我无法弄清楚，是使用条件语句吗？

我可以得到没有问题的“是”，但是要计算没有选择“是”的“否”的数量，这是我无法解决的问题。 我有感觉需要使用group by子句吗？

预期产量

SampleDidYouBuyID   SampleID    MemberID    DidYouBuy   DateAdded
-----------------------------------------------------------------
59470       23182       23      0       36:22.1
212732      23214       24      0       42:53.3
121106      23184       27      0       50:57.0
191716      23224       27      0       00:17.7
335410      23254       27      0       57:33.2
318099      23259       27      0       24:34.5
119013      23184       32      0       56:57.4
139977      23181       40      0       04:08.8

这是我希望在查询“否”时看起来的样子，请注意将具有“否”但后来回答“是”的人从结果中排除的方式

Answer 1

好吧，您的问题的简化就是计算唯一的MemberId

SELECT COUNT(*) FROM (
   SELECT * FROM SampleDidYouBuy
   WHERE SampleID = {YourSampleID}
   GROUP BY MemberID
) AS sample;

Answer 2

MySQL允许在聚合函数中使用表达式。 看看这个： http : //dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_count

因此，您的SQL语句应如下所示（如果我正确解决了您的问题？）：

SELECT MemberID, COUNT(DidYouBuy=0) as 'No-s', COUNT(DidYouBuy=1) as 'Yes-s'
FROM SampleDidYouBuy
GROUP BY MemberID

如果您希望收到每个样本的No-s数：

SELECT SampleID, MemberID, COUNT(DidYouBuy=0)
FROM SampleDidYouBuy
GROUP BY SampleID, MemberID

Answer 3

如果我理解您的问题，则可以尝试执行此查询，以查找尚未转换为“是”的唯一编号

仅针对会员ID

SELECT 
  `MemberID`, COUNT(*) 
FROM `SampleDidYouBuy` 
GROUP BY `MemberID` 
HAVING MAX(`DidYouBuy`) = 0

输出：

+----------+----------+
| MemberID | COUNT(*) |
+----------+----------+
|       23 |        1 |
|       32 |        2 |
|       40 |        2 |
+----------+----------+

对于MemberID和sampleID

SELECT 
  `MemberID`, `sampleID`, COUNT(*) 
FROM `SampleDidYouBuy` 
GROUP BY `MemberID`, `sampleID` 
HAVING MAX(`DidYouBuy`) = 0

输出量

+----------+----------+----------+
| MemberID | sampleID | COUNT(*) |
+----------+----------+----------+
|       23 |    23182 |        1 |
|       24 |    23214 |        2 |
|       27 |    23184 |        3 |
|       27 |    23224 |        2 |
|       27 |    23254 |        2 |
|       27 |    23259 |        2 |
|       32 |    23184 |        2 |
|       40 |    23181 |        2 |
+----------+----------+----------+

Answer 4

请尝试以下查询：-

select 
  (select count(MemberID) from SampleDidYouBuy where DidYouBuy='1' group by MemberID) as yesCount,
  (select count(MemberID) from SampleDidYouBuy where DidYouBuy='0' group by MemberID) as noCount 
from SampleDidYouBuy;

Answer 5

更新：

select a.MemberId,
       count(distinct a.SampleId) as unique_nos
  from SampleDidYouBuy a
 where a.DIdYouBuy = 0
   and not exists (select 1 
                     from SampleDidYouBuy b
                    where b.MemberId = a.MemberId
                      and b.SampleId = a.SampleId
                      and b.DidYouBuy = 1)
 group by a.MemberId;

小提琴演示。

要获得包含所有列的行，

select SampleDidYouBuyID, sampleid, MemberID, DIdYouBuy, DateAdded
  from SampleDidYouBuy a
 where a.DIdYouBuy = 0
   and not exists (select 1 
                     from SampleDidYouBuy b
                    where b.MemberId = a.MemberId
                     and b.SampleId = a.SampleId
                     and b.DidYouBuy = 1)
 group by memberid, sampleid
 order by MemberID,sampleid;

从预期的输出尚不清楚，应该显示重复的行之一。