在sql中获取行号

Question

我有一张这样的表：

╔════════════════════════════════════════════════════╗
║ id    project_id    resource    role    start_date ║
╠════════════════════════════════════════════════════╣
║ 1         1           Tom       Engg    2013-09-10 ║
║ 2         1           Sam       Clerk   2013-08-23 ║
╚════════════════════════════════════════════════════╝

有没有一种方法可以找到行号id，比如使用sql查询id = 2。 请提出解决方案。提前谢谢。

Answer 1

试试这个::

SELECT @rownum:=@rownum + 1 as row_number, 
       t.*
FROM ( 
   < your original query goes here >
) t,
(SELECT @rownum := 0) r

Answer 2

你可以试试这个

select rownum id from your_table where your_condition