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我想问一下关于我的sql来查看最大值和最小值的看法。从视图中搜索最大值和最小值
我创建一个视图:
create VIEW Count_Of_Appointment AS
SELECT ap.doctorID, COUNT(*) AS NumberOfAppointment, CONCAT(d.surname,'', d.given) AS doctor_name
FROM appointment AS ap Inner join doctor AS d
ON ap.doctorid = d.doctorID
GROUP BY doctorID
ORDER BY COUNT(*)
现在,我想从使用视图中找到分钟+名医生。
这里是我的代码:
SELECT a2.*
FROM
(
SELECT ap.doctorID, COUNT(*) AS Number, CONCAT(d.surname,'', d.given) AS doctor_name
FROM appointment AS ap Inner join doctor AS d
ON ap.doctorid = d.doctorID
GROUP BY doctorID
ORDER BY COUNT(*)
)a2
INNER JOIN
(
SELECT MIN(Number) AS NumberOfAppointment
FROM
(
SELECT ap.doctorID, COUNT(*) AS Number, CONCAT(d.surname,'', d.given) AS doctor_name
FROM appointment AS ap Inner join doctor AS d
ON ap.doctorid = d.doctorID
GROUP BY doctorID
ORDER BY COUNT(*)
)a1
)b
ON a2.Number = b.NumberOfAppointment
之前我做的使用视图代码。我如何使用FROM VIEW Count_Of_Appointment转换它们?
如何使用视图,我已经为寻求最大和min? – user2312354 2013-04-24 15:51:41