SQL SELECT DISTINCT ID其中说明含有一定的文本值

Question

我有一个包含下面的示例数据表： -

ID  Description 
1  John Doe 
2  Jane Doe 
3  RETRO John Doe 
3  John Doe 
4  Jane Doe 
4  RETRO Jane Doe 
5  Bobby 

ID列是不是因此主键副本ID的

我想从上表中选择所有记录，但是在复制ID的情况下，我只想选择以“RETRO”开头并忽略其他记录的记录。

Answer 1

试试这个：

SELECT ID, DESCRIPTION FROM Table 
WHERE Description LIKE 'RETRO %' 
OR ID IN (
    SELECT ID FROM Table GROUP BY ID HAVING COUNT(*) = 1 
) 

Answer 2

你可以这样说：

select * from tablename where Description like 'RETRO%' and ID in (select ID from tablename group by ID having count(ID) > 1) 
UNION ALL 
select * from tablename where ID not in (select ID from tablename group by ID having count(ID) > 1) 
order by ID, Description 

Answer 3

没有UNION的选项：

select 
    id, 
    case 
     when (count(*) =1) then max(sd.name) 
     else (select sd2.name from sampleData sd2 where sd2.id=sd.id and name like 'Retro%') 
    end 

from sampledata SD 
group by id 

Answer 4

这个答案很可能是最简单的：

SELECT ID, Description 
FROM (SELECT ID, Description 
    FROM TABLE 
    ORDER BY Description LIKE 'RETRO%' DESC, Description ASC) a 
GROUP BY ID 

这将对数据进行排序，以便Description以RETRO开头的行数最高，以便在通过ID进行分组时使用此值。