表的MySQL行数
我正在尝试获取我的表的行号。 到目前为止,这是我的SQL提示符:表的MySQL行数,mysql,sql,Mysql,Sql,我正在尝试获取我的表的行号。 到目前为止,这是我的SQL提示符: SELECT @i = @i + 1 AS Rank, x.Name, x.PartyName, x.ConstituencyName, x.Votes FROM ( SELECT CONCAT(t1.Firstname, ' ', t1.Lastname) AS Name, t1.PartyName, t1.ConstituencyName, COALESCE(t2.Count, 0) AS Votes
SELECT @i = @i + 1 AS Rank, x.Name, x.PartyName, x.ConstituencyName, x.Votes
FROM (
SELECT CONCAT(t1.Firstname, ' ', t1.Lastname) AS Name, t1.PartyName, t1.ConstituencyName, COALESCE(t2.Count, 0) AS Votes
FROM (
(SELECT db.user.PID, db.user.Firstname, db.user.Lastname, db.party.PartyName, db.constituency.ConstituencyName
FROM db.user
LEFT JOIN db.party ON db.user.PartyId = db.party.PartyID
LEFT JOIN db.constituency ON db.user.CID = db.constituency.CID
WHERE db.user.PartyId IS NOT NULL
AND db.user.CID IS NOT NULL
) t1
LEFT JOIN
(SELECT db.user.Vote, COUNT(*) AS 'Count'
FROM db.user
GROUP BY db.user.Vote
) t2
ON
t1.PID = t2.Vote
ORDER BY t2.Count DESC)
) x,
(SELECT @i:=1) r
这基本上是这样做的,首先我创建一个表t1(从两个不同的表中获取信息),然后将其与表t2连接,这样我就可以得到每个候选人的总投票数。然后,我将该表标记为“x”,并将其与表“r”连接起来,该表应该初始化行号(使用在线教程来初始化行号)。但是,当我运行此SQL提示符时,会得到以下结果:
Rank Name PartyName ConstituencyName Votes
0 Name1 Party1 Constituency1 700
0 Name2 Party1 Constituency1 550
任何建议都将不胜感激。这是用户变量,您应该使用
:=
而不是=
SELECT @i := @i + 1 AS Rank,...
天啊。我以前甚至用过这个注释(但后来数字都搞乱了,因为我当时用的是不同的函数),但是,是的,这确实奏效了。谢谢