大家下午好,
使用下面的代码,我创建了一个用于计算每英里平均时间的视图。
CREATE VIEW AverageRunTime AS
SELECT UserDetails.username AS username,
CardiovascularRecords.distance_in_miles AS distance,
CardiovascularRecords.start_time AS starttime,
CardiovascularRecords.end_time AS endtime,
sum(strftime('%s', end_time) - strftime('%s', start_time) / distance_in_miles) AS averagespeedpermile
FROM UserDetails INNER JOIN CardiovascularRecords
ON Userdetails.username=CardiovascularRecords.username
问题我遇到了考虑距离变量的问题,使用了REAL数据类型我有几个十进制值,例如0.1到1的范围。
执行上述总和时,视图将仅显示与整数相关的数据,而忽略任何包含十进制值的记录。
欢迎任何有关此问题的帮助,下面还包含与我的架构相关的代码,以允许其他人复制我的工作。
CREATE TABLE "CardiovascularRecords" ("record_ID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE CHECK (record_ID>0) , "distance_in_miles" REAL NOT NULL CHECK (distance_in_miles>0) , "username" TEXT NOT NULL , "date" DATETIME DEFAULT CURRENT_DATE, "notes" TEXT(50), "start_time" TEXT, "end_time" TEXT, FOREIGN KEY(distance_in_miles) REFERENCES DistanceinMiles(distance_in_miles) ON DELETE CASCADE ON UPDATE CASCADE,FOREIGN KEY(username) REFERENCES UserDetails(username) ON DELETE CASCADE ON UPDATE CASCADE)
CREATE TABLE "UserDetails" ("username" TEXT PRIMARY KEY NOT NULL UNIQUE CHECK (length(username)>0), "password" TEXT NOT NULL CHECK (length(password)>3), "email_address" TEXT NOT NULL UNIQUE CHECK (length(email_address)>3) , "weight_in_pounds" REAL NOT NULL CHECK(weight_in_pounds>0) CHECK (length(weight_in_pounds)>0), "height_in_inches" REAL NOT NULL CHECK(height_in_inches>0) CHECK (length(height_in_inches)>0), "age" INTEGER CHECK(age>0), WITHOUT ROWID)
提前谢谢。
答案 0 :(得分:0)
SQLite使用dynamic typing,因此可以将字符串插入distance_in_miles
列。
支票distance_in_miles>0
无效,因为any string compares larger than any number。
修复程序以将值存储为数字。