SQL SELECT DISTINCT混乱

Question

I know I can select distinct like this:

SELECT DISTINCT id, title, photo FROM myTable;

But when I want to SELECT id, title but with distinct title , what should I do?

I mean I want to select rows and avoid duplicate titles. Because maybe there be duplicate photos, but it's not important, I need only distinct titles . How then should I select photo and title fields and at the same time set title to be unique and distinct?

Answer 1

SELECT  id, title, photo FROM myTable GROUP BY title;

使用group by的简单选择查询将在此处工作。

Answer 2

Depends on your data, but basically you are looking to force photo to return a single value, along with your distinct title. Something like this:

SELECT title, MAX(photo)
FROM myTable
GROUP BY title

would do that, for example.

Answer 3

不同的照片Menas所有照片，没有重复的SELECT ID，来自myTable GROUP BY的照片；