MySQL에서 2 개 날짜의 차이 찾기

Question

두 개의 날짜 열 detail_returndate 및 detail_duedate가 있습니다. 나는이 둘의 차이점을 찾아서 days_overdue으로 반환하려고합니다.

다음은 기본 SELECT입니다. 나는 diffday를 사용하고 2를 빼내려고했지만 많은 행운이 없다. 당신이 알려하지만 난 당신이되고 그것을

가 필요합니다 생각하지 않습니다 테이블의 전체 SQL 코드가 필요한 경우

select rent_num, vid_num, detail_returndate, detail_duedate 
    from detailrental 

분명 내가 필요로하는 차이를 복용에 의해 발견되는 연체 일 detail_returndate과 detail_duedate 사이 이 일

/* Database Systems, 9th Ed., Coronel/MOrris/Rob */ 
/* Type of SQL : MySQL */ 

/*Create table price*/ 
CREATE TABLE price 
(price_code   INTEGER  PRIMARY KEY AUTO_INCREMENT, 
price_description VARCHAR(20) NOT NULL, 
price_rentfee  DECIMAL(5,2), 
price_dailylatefee DECIMAL(5,2)); 


/*Insert data into price*/ 
INSERT INTO price VALUES(1,'Standard',2,1); 
INSERT INTO price VALUES(2,'New Release',3.5,3); 
INSERT INTO price VALUES(3,'Discount',1.5,1); 
INSERT INTO price VALUES(4,'Weekly Special',1,.5); 


/*Create table movie*/ 
CREATE TABLE movie 
(movie_num INTEGER  PRIMARY KEY AUTO_INCREMENT, 
movie_title VARCHAR(75) NOT NULL, 
movie_year INTEGER, 
movie_cost DECIMAL(5,2), 
movie_genre VARCHAR(50), 
price_code INTEGER, 
FOREIGN KEY(price_code) REFERENCES price(price_code)); 

/*Insert data into movie*/ 
INSERT INTO movie VALUES(1234,'The Cesar Family Christmas',2007,39.95,'FAMILY',2); 
INSERT INTO movie VALUES(1235,'Smokey Mountain Wildlife',2004,59.95,'ACTION',1); 
INSERT INTO movie VALUES(1236,'Richard Goodhope',2008,59.95,'DRAMA',2); 
INSERT INTO movie VALUES(1237,'Beatnik Fever',2007,29.95,'COMEDY',2); 
INSERT INTO movie VALUES(1238,'Constant Companion',2008,89.95,'DRAMA',NULL); 
INSERT INTO movie VALUES(1239,'Where Hope Dies',1998,25.49,'DRAMA',3); 
INSERT INTO movie VALUES(1245,'Time to Burn',2005,45.49,'ACTION',1); 
INSERT INTO movie VALUES(1246,'What He Doesn''t Know',2006,58.29,'COMEDY',1); 


/*Create table video*/ 
CREATE TABLE video 
(vid_num  INTEGER PRIMARY KEY AUTO_INCREMENT, 
vid_indate DATE, 
movie_num INTEGER, 
FOREIGN KEY(movie_num) REFERENCES movie(movie_num)); 

/*Insert data into video*/ 
INSERT INTO video VALUES(54321,'2008-06-18',1234); 
INSERT INTO video VALUES(54324,'2008-06-18',1234); 
INSERT INTO video VALUES(54325,'2008-06-18',1234); 
INSERT INTO video VALUES(34341,'2007-01-22',1235); 
INSERT INTO video VALUES(34342,'2007-01-22',1235); 
INSERT INTO video VALUES(34366,'2009-03-02',1236); 
INSERT INTO video VALUES(34367,'2009-03-02',1236); 
INSERT INTO video VALUES(34368,'2009-03-02',1236); 
INSERT INTO video VALUES(34369,'2009-03-02',1236); 
INSERT INTO video VALUES(44392,'2008-10-21',1237); 
INSERT INTO video VALUES(44397,'2008-10-21',1237); 
INSERT INTO video VALUES(59237,'2009-02-14',1237); 
INSERT INTO video VALUES(61388,'2007-01-25',1239); 
INSERT INTO video VALUES(61353,'2006-01-28',1245); 
INSERT INTO video VALUES(61354,'2006-01-28',1245); 
INSERT INTO video VALUES(61367,'2008-07-30',1246); 
INSERT INTO video VALUES(61369,'2008-07-30',1246); 


/*Create table membership*/ 
CREATE TABLE membership 
(mem_num  INTEGER  PRIMARY KEY AUTO_INCREMENT, 
mem_fname VARCHAR(30) NOT NULL, 
mem_lname VARCHAR(30) NOT NULL, 
mem_street VARCHAR(120), 
mem_city VARCHAR(50), 
mem_state VARCHAR(2), 
mem_zip  VARCHAR(5), 
mem_balance DECIMAL(10,2)); 

/*Insert data into membership*/ 
INSERT INTO membership VALUES(102,'Tami','Dawson','2632 Takli Circle','Norene','TN','37136',11); 
INSERT INTO membership VALUES(103,'Curt','Knight','4025 Cornell Court','Flatgap','KY','41219',6); 
INSERT INTO membership VALUES(104,'Jamal','Melendez','788 East 145th Avenue','Quebeck','TN','38579',0); 
INSERT INTO membership VALUES(105,'Iva','Mcclain','6045 Musket Ball Circle','Summit','KY','42783',15); 
INSERT INTO membership VALUES(106,'Miranda','Parks','4469 Maxwell Place','Germantown','TN','38183',0); 
INSERT INTO membership VALUES(107,'Rosario','Elliott','7578 Danner Avenue','Columbia','TN','38402',5); 
INSERT INTO membership VALUES(108,'Mattie','Guy','4390 Evergreen Street','Lily','KY','40740',0); 
INSERT INTO membership VALUES(109,'Clint','Ochoa','1711 Elm Street','Greenville','TN','37745',10); 
INSERT INTO membership VALUES(110,'Lewis','Rosales','4524 Southwind Circle','Counce','TN','38326',0); 
INSERT INTO membership VALUES(111,'Stacy','Mann','2789 East Cook Avenue','Murfreesboro','TN','37132',8); 
INSERT INTO membership VALUES(112,'Luis','Trujillo','7267 Melvin Avenue','Heiskell','TN','37754',3); 
INSERT INTO membership VALUES(113,'Minnie','Gonzales','6430 Vasili Drive','Williston','TN','38076',0); 


/*Create table rental*/ 
CREATE TABLE rental 
(rent_num INTEGER PRIMARY KEY AUTO_INCREMENT, 
rent_date DATE, 
mem_num INTEGER, 
FOREIGN KEY(mem_num) REFERENCES membership(mem_num)); 

/*Insert data into rental*/ 
INSERT INTO rental VALUES(1001,'2009-03-01',103); 
INSERT INTO rental VALUES(1002,'2009-03-01',105); 
INSERT INTO rental VALUES(1003,'2009-03-02',102); 
INSERT INTO rental VALUES(1004,'2009-03-02',110); 
INSERT INTO rental VALUES(1005,'2009-03-02',111); 
INSERT INTO rental VALUES(1006,'2009-03-02',107); 
INSERT INTO rental VALUES(1007,'2009-03-02',104); 
INSERT INTO rental VALUES(1008,'2009-03-03',105); 
INSERT INTO rental VALUES(1009,'2009-03-03',111); 


/*Create table detailrental*/ 
CREATE TABLE detailrental 
(rent_num   INTEGER, 
vid_num    INTEGER, 
detail_fee   DECIMAL(5,2), 
detail_duedate  DATE, 
detail_returndate DATE, 
detail_dailylatefee DECIMAL(5,2), 
PRIMARY KEY(rent_num, vid_num), 
FOREIGN KEY(rent_num) REFERENCES rental(rent_num), 
FOREIGN KEY(vid_num) REFERENCES video(vid_num)); 

/*Insert data into dailyrental*/ 
INSERT INTO detailrental VALUES(1001,34342,2,'2009-03-04','2009-03-02',1); 
INSERT INTO detailrental VALUES(1001,61353,2,'2009-03-04','2009-03-03',1); 
INSERT INTO detailrental VALUES(1002,59237,3.5,'2009-03-04','2009-03-04',3); 
INSERT INTO detailrental VALUES(1003,54325,3.5,'2009-03-04','2009-03-09',3); 
INSERT INTO detailrental VALUES(1003,61369,2,'2009-03-06','2009-03-09',1); 
INSERT INTO detailrental VALUES(1003,61388,0,'2009-03-06','2009-03-09',1); 
INSERT INTO detailrental VALUES(1004,44392,3.5,'2009-03-05','2009-03-07',3); 
INSERT INTO detailrental VALUES(1004,34367,3.5,'2009-03-05','2009-03-07',3); 
INSERT INTO detailrental VALUES(1004,34341,2,'2009-03-07','2009-03-07',1); 
INSERT INTO detailrental VALUES(1005,34342,2,'2009-03-07','2009-03-05',1); 
INSERT INTO detailrental VALUES(1005,44397,3.5,'2009-03-05','2009-03-05',3); 
INSERT INTO detailrental VALUES(1006,34366,3.5,'2009-03-05','2009-03-04',3); 
INSERT INTO detailrental VALUES(1006,61367,2,'2009-03-07',NULL,1); 
INSERT INTO detailrental VALUES(1007,34368,3.5,'2009-03-05',NULL,3); 
INSERT INTO detailrental VALUES(1008,34369,3.5,'2009-03-05','2009-03-05',3); 
INSERT INTO detailrental VALUES(1009,54324,3.5,'2009-03-05',NULL,3); 
INSERT INTO detailrental VALUES(1001,34366,3.5,'2009-03-04','2009-03-02',3); 

Answer 1

SELECT rent_num, 
     vid_num, 
     detail_returndate, 
     detail_duedate, 
     DATEDIFF(detail_duedate, detail_returndate) as days_overdue  
FROM detailrental 

Answer 2

위 그림과 같이 작동합니다에 연체 금액, 을 산출한다. 아마도 의무적으로`를 추가하십시오. 도시 된 바와 같이 그것이 days_overdue하는 양수를 제공해야하므로

SELECT `rent_num`, 
     `vid_num`, 
     `detail_returndate`, 
     `detail_duedate`, 
     DATEDIFF(`detail_returndate`,`detail_duedate`) as days_overdue 
FROM detailrental 

또한 DATEDIFF는 제으로부터 제 2 값을 감산한다.