我有兩個表'學生'和'團隊'。我想根據球隊名稱顯示學生人數,球隊Team_id是主鍵。子查詢作爲列:嵌套子查詢
我想這樣
(SELECT(SELECT team,count(*) as team
FROM student GROUP BY team) AS total,
(SELECT team_name
from team WHERE team_id IN (SELECT team
FROM student GROUP BY team)) as team)
我想輸出
Team Name Total Student
-----------------------------
Team 1 25
Team 2 10
表 '學生'
CREATE TABLE IF NOT EXISTS `student` (
`id` int(255) NOT NULL AUTO_INCREMENT,
`rid` varchar(200) NOT NULL,
`sid` varchar(200) NOT NULL,
`name` varchar(600) NOT NULL,
`age` varchar(200) NOT NULL,
`dob` varchar(200) NOT NULL,
`sex` varchar(200) NOT NULL,
`weight` varchar(200) NOT NULL,
`height` varchar(200) NOT NULL,
`team` varchar(600) NOT NULL,
`age_group` varchar(200) NOT NULL,
`weight_group` varchar(500) NOT NULL,
`belt` varchar(200) NOT NULL,
`black_belt` varchar(200) NOT NULL,
`ikata` varchar(20) NOT NULL,
`ikumite` varchar(20) NOT NULL,
`team_kata` varchar(20) NOT NULL,
`special_entry` varchar(20) NOT NULL,
`challange` varchar(50) NOT NULL,
`state` varchar(200) NOT NULL,
`weapon` varchar(200) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=latin1;
表 '團隊'
CREATE TABLE IF NOT EXISTS `team` (
`id` int(20) NOT NULL AUTO_INCREMENT,
`team_id` varchar(500) NOT NULL,
`team_name` varchar(500) NOT NULL,
`address` varchar(500) NOT NULL,
`coach_name` varchar(500) NOT NULL,
`coach_number` varchar(500) NOT NULL,
`coach_email` varchar(500) NOT NULL,
`gold` varchar(200) NOT NULL,
`state` varchar(500) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=4 DEFAULT CHARSET=latin1;
你能張貼你的表結構? –
SELECT子句中的子查詢可能不會返回多個結果。 – Uueerdo
這些表格是如何關聯的?換句話說,你如何將學生與團隊聯繫起來? – BrandonM