SQL查询，需要不同的行

Question

嘿伙计们，我的结构如下：

所以基本上你可以看到，该部门每隔几年就会更名。以16号为例。我想要一个只在日期最大时获取名称的选择查询。我该怎么做？

Answer 1

select ID, Name from departments o 
where o.thedate=
  (select max(i.thedate) from departments i where o.id=i.id)

Answer 2

SELECT ID, 
First(Name) AS FirstOfName, First(DateChange) AS FirstOfDateChange
FROM departments
GROUP BY ID
ORDER BY First(DateChange) DESC;

Answer 3

此表的主键是什么？这使子查询与名称比较的表相同。

SELECT
    id,
    name,
    date
FROM table
WHERE name = (SELECT TOP 1 name
              FROM table AS subtable
              WHERE subtable.name = table.name
              ORDER BY date DESC)

Answer 4

SELECT d。* 来自部门d INNER JOIN（选择pk             来自部门             GROUP BY ID             HADING theDate = MAX（theDate））m ON m.pk = d.pk 在哪里[名称] =“部门”