Getting rank of a row in mysql query

问题

I was using this query to assign rank to every name according to the votes they have got, but it returns with the error :

1248 - Every derived table must have its own alias

Here is my code:

SELECT @rownum:=@rownum+1 AS rank, name, vote 
FROM table, (SELECT @rownum:=0) ORDER BY vote DESC

On modifying the query to this :-

SELECT @rownum:=@rownum+1 AS rank, name, vote 
FROM table ORDER BY vote DESC

I get as expected rank of the queries as NULL. Any help , how to get rank at first place ?

NOTE: I am not looking for any alternative solution. Just trying to do it in the query itself.

回答1:

The error is pretty clear. Every derived table must have its own alias. You need to alias the (SELECT @rownum := 0) like so:

SELECT 
  @rownum := @rownum + 1 AS rank, 
  name,
  vote 
FROM table, (SELECT @rownum := 0) t --This what you were missing an alias
ORDER BY vote DESC

SQL Fiddle Demo

来源：https://stackoverflow.com/questions/13209227/getting-rank-of-a-row-in-mysql-query