MySQL-根据最新日期和每列ID列表将行转换为列

即使经过数小时的搜索和尝试，我仍然无法理解这一点。也许我没有选择正确的词语

好的，我有一张表，上面有这样的事件：

EVENT
+----+------------+------------+------+
| id | id_article | id_section | date |
+----+------------+------------+------+
|  1 |          1 |          1 | 2011 |
|  2 |          1 |          3 | 2012 |
|  3 |          2 |          7 | 2013 |
|  4 |          2 |          6 | 2014 |
|  5 |          3 |         14 | 2015 |
|  6 |          3 |         13 | 2016 |
|  7 |          3 |          0 | 2017 |
+----+------------+------------+------+

我想将这个表分成三个不同的列，其中每列都包含id_部分列表中的最新事件（id_部分和日期）。那么基本上是这样的,

EVENT
+----+------------+------------+------+
| id | id_article | id_section | date |
+----+------------+------------+------+
|  1 |          1 |          1 | 2011 |
|  2 |          1 |          3 | 2012 |
|  3 |          2 |          7 | 2013 |
|  4 |          2 |          6 | 2014 |
|  5 |          3 |         14 | 2015 |
|  6 |          3 |         13 | 2016 |
|  7 |          3 |          0 | 2017 |
+----+------------+------------+------+

截面A=id_截面（1,2,3,4,5）和最大值（日期）

节B=id_节（6,7,8,9,10）和最大值（日期）

第C节=第（11,12,13,14,15）节中的id和最大值（日期）

期望的结果
+------------+----------+----------+-----------+
|id|U文章| A部分| B部分| C部分| id|U事件
+------------+----------+----------+-----------+
|1 | 3（2012）| null | null | id 2
|2 | null | 6（2014）| null | id 4
|3 | 0（2017）| null | 13（2016）|#id 7,6根据您当前的查询，我对子查询做了一些更改，以确定每个id|u文章上有多个部分时的最大值。此外，第A部分的列表中应包括0

SELECT e1.id_article, 
       MAX(CASE WHEN section = 'SectionA' 
                THEN CONCAT(e2.id_section, ' (', e2.date, ')') END) AS sectionA, 
       MAX(CASE WHEN section = 'SectionB' 
                THEN CONCAT(e2.id_section, ' (', e2.date, ')') END) AS sectionB, 
       MAX(CASE WHEN section = 'SectionC'
                THEN CONCAT(e2.id_section, ' (', e2.date, ')') END) AS sectionC
  FROM event e1
 INNER JOIN (SELECT a.id_article,
                    a.id_section,       
                    a.`date`,
                    a.section,
                    COUNT(*) row_number
               FROM (SELECT *,
                            CASE WHEN id_section IN (0,1,2,3,4,5)
                                 THEN 'SectionA'
                                 WHEN id_section IN (6,7,8,9,10)
                                 THEN 'SectionB'
                                 WHEN id_section IN (11,12,13,14,15)
                                 THEN 'SectionC'
                             END section
                       FROM `event`) a
              INNER JOIN  (SELECT *,
                                  CASE WHEN id_section IN (0,1,2,3,4,5)
                                       THEN 'SectionA'
                                       WHEN id_section IN (6,7,8,9,10)
                                       THEN 'SectionB'
                                       WHEN id_section IN (11,12,13,14,15)
                                       THEN 'SectionC'
                                   END section
                             FROM `event`) b
                 ON a.id_article = b.id_article
                AND a.section = b.section
                AND a.`date` <= b.`date`
              GROUP BY a.id_article,
                       a.id_section,       
                       a.`date`
            ) e2
    ON e1.id_article = e2.id_article 
   AND e1.date = e2.date
 WHERE e2.row_number = 1
 GROUP BY e1.id_article

如果有关系的话？@GordonLinoff也许会选择id更高的（活动）谢谢！（是的，我忘记了零）有可能用这个创建一个视图吗？我需要它作为php中网格的数据源？：）
SELECT e1.id_article, 
       MAX(CASE WHEN section = 'SectionA' 
                THEN CONCAT(e2.id_section, ' (', e2.date, ')') END) AS sectionA, 
       MAX(CASE WHEN section = 'SectionB' 
                THEN CONCAT(e2.id_section, ' (', e2.date, ')') END) AS sectionB, 
       MAX(CASE WHEN section = 'SectionC'
                THEN CONCAT(e2.id_section, ' (', e2.date, ')') END) AS sectionC
  FROM event e1
 INNER JOIN (SELECT a.id_article,
                    a.id_section,       
                    a.`date`,
                    a.section,
                    COUNT(*) row_number
               FROM (SELECT *,
                            CASE WHEN id_section IN (0,1,2,3,4,5)
                                 THEN 'SectionA'
                                 WHEN id_section IN (6,7,8,9,10)
                                 THEN 'SectionB'
                                 WHEN id_section IN (11,12,13,14,15)
                                 THEN 'SectionC'
                             END section
                       FROM `event`) a
              INNER JOIN  (SELECT *,
                                  CASE WHEN id_section IN (0,1,2,3,4,5)
                                       THEN 'SectionA'
                                       WHEN id_section IN (6,7,8,9,10)
                                       THEN 'SectionB'
                                       WHEN id_section IN (11,12,13,14,15)
                                       THEN 'SectionC'
                                   END section
                             FROM `event`) b
                 ON a.id_article = b.id_article
                AND a.section = b.section
                AND a.`date` <= b.`date`
              GROUP BY a.id_article,
                       a.id_section,       
                       a.`date`
            ) e2
    ON e1.id_article = e2.id_article 
   AND e1.date = e2.date
 WHERE e2.row_number = 1
 GROUP BY e1.id_article

id_article  sectionA    sectionB    sectionC
1           3 (2012)    (null)      (null)
2           (null)      6 (2014)    (null)
3           0 (2017)    (null)      13 (2016)