仅选择一个匹配不同值的行

Question

我想知道如何查询这个结构： 我怎么能

SELECT only 1 ID FROM portfolio 
WHERE category = "x" AND DISTINCT description = 'x'?

（表名和字段）

portfolio:
ID, client, section, category, description, year, files

编辑：谢谢你的回答。

Answer 1

SELECT MAX(ID)
FROM profolio
WHERE category = 'x' AND description = 'x'

Answer 2

您可以在mysql中使用limit语句，如下所示。

select id from portfolio where category='x' and description='x' limit 1 offset 0

Answer 3

SELECT ID from portfolio WHERE category = 'x' AND description = 'x' LIMIT 1;