Question

我有一个包含以下示例数据的表： -

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列不是主键，因此是重复ID

我想从上表中选择所有记录，但在ID重复的地方我只想选择以“RETRO”开头的记录并忽略其他记录。

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

你可以这样做：

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

这个答案可能最简单：

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，以使Description以RETRO开头的行最高，以便在按ID分组时使用此值。

SQL选择DISTINCT ID，其中Description包含特定文本值

4 个答案: