在MySQL中使用LIMIT时如何轻松获取行号？

Question

Suppose I have a database table with quite a few rows which I want to display to an user. It would make sense to LIMIT the output, and make pages of rows. In MySQL I would do this:

SELECT * FROM myTable ORDER BY myValue LIMIT 120,10

which will show 10 rows starting from row 120. So MySQL must use, internally, some kind of order, and has numbered the rows accordingly. I would like to display the row number with each row. How do I get access to these numbers, using only MySQL? To be clear, I am looking for something like this:

SELECT *,<LIMIT_ROWNO> FROM myTable ORDER BY myValue LIMIT 120,10

I looked online and in the manual, but I cannot find it. I would prefer something simple, without using variables, or functions. Isn't there a predefined expression for this?

I can solve this problem easily in PHP, but it would be more logical to get the row numbers from MySQL.

Answer 1

You can't do it without using variables, eg:

SELECT m.*, @rownum := @rownum + 1 as `num`
FROM myTable m, (SELECT @rownum := 120) a 
ORDER BY myValue LIMIT 120,10;

Answer 2

set @rownum=120;
SELECT *,@rownum:=@rownum+1 as rn FROM myTable ORDER BY myValue LIMIT 120,10;