Question

我想请所有朋友帮我解决问题。

我有几个想要连接的表。

客户表

   id     | name_cust                         | idmd_pic
-----------------------------+--------------------------
   10     | CF Sukajadi Bandung               | 7
   11     | SPM Toserba Griya Dinasti         | 7
   12     | SPM Toserba Yogya GATSU           | 7
   13     | SPM Toserba Yogya Lucky Square    | 17
   14     | PT Transretail Indonesia/ Sukajadi| 7

details_the visit table

   id     | idcust | name_cust                          | visit_date | idmd_visit
-----------------------------+---------------------------------------------------
   20     | 12     | SPM Toserba Yogya GATSU            | 2018-03-23 | 7
   21     | 13     | SPM Toserba Yogya Lucky Square     | 2018-03-23 | 17
   22     | 11     | SPM Toserba Griya Dinasti          | 2018-03-23 | 7
   23     | 14     | PT Transretail Indonesia/ Sukajadi | 2018-03-24 | 7
   24     | 11     | SPM Toserba Griya Dinasti          | 2018-03-24 | 7
   25     | 10     | CF Sukajadi Bandung                | 2018-03-24 | 7
   26     | 13     | SPM Toserba Yogya Lucky Square     | 2018-03-24 | 7
   27     | 12     | SPM Toserba Yogya GATSU            | 2018-03-24 | 7
   28     | 11     | SPM Toserba Griya Dinasti          | 2018-03-29 | 17

datamd table

   id     | name_md                           | visit_rotation
-----------------------------+--------------------------
   7      | Nunu Nugraha                      | 9
   17     | Erwin                             | 10

我想生成这样的数据

   id     | name_cust                         | idmd_pic | visit_date | idmd_visit | visit_rotation |
-----------------------------+------------------------------------------------------------
   10     | CF Sukajadi Bandung               | 7        | 2018-03-24 | 7      | 9
   11     | SPM Toserba Griya Dinasti         | 7        | 2018-03-24 | 7      | 9
   12     | SPM Toserba Yogya GATSU           | 7        | 2018-03-24 | 7      | 9
   13     | SPM Toserba Yogya Lucky Square    | 17       | 2018-03-23 | 17     | 10
   14     | PT Transretail Indonesia/ Sukajadi| 7        | 2018-03-24 | 7      | 9

这里我很困惑如何使数据可以像那样显示，我无法按照其idmd_pic和最新访问日期显示数据，希望这里的朋友可以帮忙，谢谢。

Answer 1

SELECT c.id,
       c.name_cust,
       c.idmd_pic,
       max(dt.visit_date) as visit_date,
       dt.idmd_visit,
       dm.visit_rotation 
From customer c
inner join details_the dt
on c.id=dt.idcust 
and c.idmd_pic=dt.idmd_visit
inner join datamd dm
on c.idmd_pic=dm.id
GROUP BY C.id
ORDER BY c.id

现场演示

http://sqlfiddle.com/#!9/a44a42/2

在mysql上显示数据3表

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