我如何：从结果中排序COUNT（column1）：SELECT DISTINCT column1，column2

Question

Because the title is probably bad, and I'm very weak with SQL, I'll try to clarify my goal:

if:

SELECT DISTINCT host, author FROM t;

Looks like:

foo.com | John
bar.com | Bob
bar.com | Alice

How do I get results like:

foo.com | 1
bar.com | 2

Let me know if this isn't clear enough, and I will update, or respond to comments.

Answer 1

You want a group by , not select distinct :

SELECT host, count(*)
FROM t
GROUP BY host
ORDER BY count(*);

If you might have duplicate host/author combinations, then you might want count(distinct author) :

SELECT host, count(distinct author)
FROM t
GROUP BY host
ORDER BY count(distinct author);