如何根據積分排列以下用戶的排名。我真的很感激任何幫助。 在此先感謝。根據積分排名的用戶
http://sqlfiddle.com/#!2/374db/11
CREATE TABLE if not exists tblA
(
id int(11) NOT NULL auto_increment ,
sender varchar(255),
receiver varchar(255),
msg varchar(255),
date timestamp,
points varchar(255),
refno varchar(255),
PRIMARY KEY (id)
);
CREATE TABLE if not exists tblB
(
id int(11) NOT NULL auto_increment ,
sno varchar(255),
name varchar(255),
PRIMARY KEY (id)
);
CREATE TABLE if not exists tblC
(
id int(11) NOT NULL auto_increment ,
data varchar(255),
refno varchar(255),
extrarefno varchar(255),
PRIMARY KEY (id)
);
INSERT INTO tblA (sender, receiver,msg,date,points,refno) VALUES
('1', '2', 'buzz ...','2011-08-21 14:11:09','10','001'),
('1', '2', 'test ...','2011-08-21 14:12:19','20','002'),
('4', '2', 'test ...','2011-08-21 14:13:19','30','003'),
('1', '3', 'buzz ...','2011-08-21 14:11:09','10','004'),
('1', '3', 'test ...','2011-08-21 14:12:19','20','005'),
('1', '4', 'buzz ...','2011-08-21 14:11:09','10','006'),
('1', '4', 'test ...','2011-08-21 14:12:19','20','007'),
('3', '4', 'test ...','2011-08-21 14:13:19','20','008'),
('2', '4', 'test ...','2011-08-21 14:13:19','20','009');
INSERT INTO tblB (sno, name) VALUES
('1', 'Aa'),
('2', 'Bb'),
('3', 'Cc'),
('4', 'Dd'),
('5', 'Ee'),
('6', 'Ff'),
('7', 'Gg'),
('8', 'Hh');
INSERT INTO tblC (data,refno,extrarefno) VALUES
('data1', '001', '101'),
('data2', '002', '102'),
('data3', '003', '103'),
('data4', '004', '101'),
('data5', '005', '102'),
('data6', '006', '103'),
('data7', '007', '101'),
('data8', '008', '101'),
('data9', '009', '101');
SQL
SELECT *
FROM (SELECT tblA.receiver, MAX(tblA.id) AS id
FROM tblA
GROUP BY tblA.receiver
) subset JOIN
tblA
ON subset.receiver = tblA.receiver AND subset.id = tblA.id JOIN
tblB
on tblA.receiver = tblB.sno join
tblC
ON tblA.refno=tblC.refno ;
你能更好地解釋你的模式和數據嗎?您的超級通用表名稱並不能讓我們深入瞭解您的查詢的真實含義,以及它爲什麼會出錯。你現在從查詢中得到什麼結果與你在找什麼結果? –
爲什麼列是用戶? – malta
是基於每個tblA條目或發件人的積分總和嗎?看一看密集的等級()(按點數排序)。這可能是你以後的事情。 –