Sql 查询以计算屏幕中预订和保留的座位数量_Sql_Sql Server_Sql Server 2008_Sql Server 2012

Sql 查询以计算屏幕中预订和保留的座位数量

sql sql-server sql-server-2008 sql-server-2012

Sql 查询以计算屏幕中预订和保留的座位数量,sql,sql-server,sql-server-2008,sql-server-2012,Sql,Sql Server,Sql Server 2008,Sql Server 2012,我试图写一个查询来检查屏幕上一部电影有多少座位已经坐满了，还有多少座位排在了一起，但经过几个小时的尝试后，我仍然无法理解，我尝试了很多查询，甚至改变了where子句的子查询，每次我都会遇到一些错误：（我使用的查询如下所示： select 10 as [total seats in a row], perName as [movie name], seatRow as [seat row], (filledSeats - 10) as [seats left i

我试图写一个查询来检查屏幕上一部电影有多少座位已经坐满了，还有多少座位排在了一起，但经过几个小时的尝试后，我仍然无法理解，我尝试了很多查询，甚至改变了where子句的子查询，每次我都会遇到一些错误：（

我使用的查询如下所示：

select 
    10 as [total seats in a row],
    perName as [movie name],
    seatRow as [seat row],
    (filledSeats - 10) as [seats left in a row]
    count(s.seatNo) filledSeats  
FROM 
     seats as s inner join 
     tickets as t on s.seatNo = t.seatNo inner join 
     performances as p on t.perID = p.perID 
 where 
     screenNo = '2' AND 
     perName = '50 shades of Grey'
 group by 
     perName

但即使是这个也给了我错误

样本数据如下：

CREATE TABLE seats (
seatNo int IDENTITY (1,1) not null,
screenNo int,
screen varchar (20),
seatType Varchar (10),
seatRow varchar (5),
PRIMARY KEY (seatNo),
FOREIGN KEY (screenNo) REFERENCES screens
);
insert into seats values ('1','3', 'Normal', 'A');
insert into seats values ('1','3', 'Normal', 'B');
insert into seats values ('1','3', 'VIP', 'D');
insert into seats values ('1','1', 'Normal', 'F');
insert into seats values ('1','3', 'VIP', 'E');
insert into seats values ('1','2', 'VIP', 'C');
insert into seats values ('1','1', 'VIP', 'C');
insert into seats values ('2','2', 'Normal', 'D');
insert into seats values ('2','1', 'VIP', 'F');
insert into seats values ('2','2', 'Normal', 'B');
insert into seats values ('2','1', 'Normal', 'B');
insert into seats values ('2','2', 'VIP', 'B');
insert into seats values ('2','2',  'Normal', 'A');
insert into seats values ('3','2', 'VIP', 'B');
insert into seats values ('2','1', 'Normal', 'C');
insert into seats values ('3','3', 'Normal', 'E');
insert into seats values ('3','2', 'VIP', 'C');
insert into seats values ('3','3', 'VIP', 'A');
insert into seats values ('3','1', 'VIP', 'E');
insert into seats values ('3','1', 'Normal', 'D');   

CREATE TABLE performances( 
perID int IDENTITY (1,1)NOT NULL,  
perName varchar (50),
perTime Time,
perDate Date, 
perType varchar (20),
duration varchar (10),
screenNo int,
rating varchar (10),
location varchar (10),
PRIMARY KEY (perID),   
);
insert into performances values ('50 Shades of Grey', '12:00', '2015-03-08',     'Movie', '2hrs', '3', 'PG', 'Chelmsford');
insert into performances values ('50 Shades of Grey', '15:00', '2015-02-20', 'Movie', '2hrs', '2', '18', 'Chelmsford');
insert into performances values ('50 Shades of Grey', '18:00', '2015-02-26', 'Movie', '2hrs', '3', '18', 'Chelmsford');
insert into performances values ('50 Shades of Grey', '21:00', '2015-03-28', 'Movie', '2hrs', '2', 'PG', 'Chelmsford');
insert into performances values ('Paddington', '12:00', '2015-03-26', 'Movie', '2:30hrs', '2', '18', 'Chelmsford');
insert into performances values ('Paddington', '15:00', '2015-03-03', 'Movie', '2:30hrs', '3', 'PG', 'Chelmsford');
insert into performances values ('Paddington', '18:00', '2015-02-02', 'Movie', '2:3hrs', '3', 'PG', 'Chelmsford');
insert into performances values ('Paddington', '21:00', '2015-03-31', 'Movie', '2:30hrs', '1', '18', 'Chelmsford');
insert into performances values ('Shakespeare', '12:00', '2015-02-25', 'Movie', '3hrs', '2', '18', 'Chelmsford');
insert into performances values ('Shakespeare', '15:00', '2015-02-06', 'Movie', '3hrs', '3', 'PG', 'Chelmsford');
insert into performances values ('Shakespeare', '18:00', '2015-02-13', 'Movie', '3hrs', '3', '18', 'Chelmsford');
insert into performances values ('Shakespeare', '21:00', '2015-01-09', 'Movie', '3hrs', '3', 'PG', 'Chelmsford');
insert into performances values ('Jupiter Ascending', '12:00', '2015-01-11', 'Movie', '2:3hrs', '1', '18', 'Chelmsford');
insert into performances values ('Jupiter Ascending', '15:00', '2015-01-19', 'Movie', '2:30hrs', '2', '18', 'Chelmsford');
insert into performances values ('Jupiter Ascending', '18:00', '2015-02-06', 'Movie', '2:3hrs', '3', 'PG', 'Chelmsford');
insert into performances values ('Jupiter Ascending', '21:00', '2015-01-02', 'Movie', '2:3hrs', '2', 'PG', 'Chelmsford');
insert into performances values ('50 Shades of Grey', '12:00', '2015-01-06', 'Movie', '2hrs', '1', '18', 'Chelmsford');
insert into performances values ('50 Shades of Grey', '15:00', '2015-03-28', 'Movie', '2hrs', '3', 'PG', 'Chelmsford');
insert into performances values ('50 Shades of Grey', '18:00', '2015-02-09', 'Movie', '2hrs', '2', 'PG', 'Chelmsford');
insert into performances values ('50 Shades of Grey', '21:00', '2015-02-06', 'Movie', '2hrs', '2', '18', 'Chelmsford');


CREATE TABLE bookings( 
     bookingID int IDENTITY (1,1) NOT NULL,  
     customerID int ,
     clerkID varchar (20) ,
     perID int,
     ticketBooked int, 
     bookingDate Date,   
     bookingTime time,
     bookingType varchar(20),
     totalCost decimal(5,2),
     PRIMARY KEY (bookingID),
     FOREIGN KEY (customerID) REFERENCES customers,
     FOREIGN Key (clerkID) REFERENCES clerks, 
    );  

insert into bookings values (16, 'clerk04', 1, 2, '2015-02-24', '12:00', 'Normal', '20');
insert into bookings values (2, 'clerk02', 20,3, '2015-02-25', '15:00', 'Advance', '34');
insert into bookings values (10, 'clerk04', 3,5, '2015-02-17', '18:00', 'Advance', '75');
insert into bookings values (5, 'clerk01', 19,2, '2015-01-24', '21:00', 'Advance', '30');
insert into bookings values (13, 'clerk01', 4,1, '2015-02-05', '12:00', 'Normal', '10');
insert into bookings values (20, 'clerk04', 5,1,'2015-01-26', '15:00', 'Normal', '12');
insert into bookings values (4, 'clerk03', 6, 3,'2015-02-09', '18:00', 'Advance', '30');
insert into bookings values (1, 'clerk03', 2, 1,'2015-01-03', '21:00', 'Advance', '15');
insert into bookings values (17, 'clerk04', 3, 1,'2015-02-09', '12:00', 'Normal', '12');
insert into bookings values (9, 'clerk02', 18,2,'2015-02-02', '15:00', 'Advance', '20');
insert into bookings values (11, 'clerk01', 6,3,'2015-02-10', '18:00', 'Advance', '45');
insert into bookings values (18, 'clerk01',1 ,1,'2015-02-06', '21:00', 'Normal', '12');
insert into bookings values (8, 'clerk05', 5,2,'2015-01-13', '12:00', 'Advance', '20');
insert into bookings values (6, 'clerk02', 7,2,'2015-02-05', '15:00', 'Advance', '20');
insert into bookings values (10, 'clerk03', 8,1,'2015-02-14', '18:00', 'Normal', '15');
insert into bookings values (14, 'clerk01', 9,2,'2015-01-19', '21:00', 'Normal', '20');
insert into bookings values (7, 'clerk05', 10, 3,'2015-01-29', '12:00', 'Advance','34');
insert into bookings values (3, 'clerk01', 12, 1,'2015-02-18', '15:00', 'Normal', '12');
insert into bookings values (13, 'clerk02', 15,3,'2015-01-08', '18:00', 'Normal', '45');
insert into bookings values (19, 'clerk03', 6, 2,'2015-01-27', '21:00', 'Normal', '30');

 CREATE Table tickets (
 ticketNo int  IDENTITY (1,1) Not Null,
 bookingID int,  
 perID int,
 seatNo int,
 ticketType varchar(10),
 ticketDate date, 
 ticketPrice decimal (4,2),
 screen int,
 perTime time,
 PRIMARY KEY (ticketNo),
 FOREIGN KEY (bookingID) REFERENCES bookings,
 FOREIGN KEY (perID) REFERENCES performances, 
 FOREIGN KEY (seatNo) REFERENCES seats,
 ); 
insert into tickets values (20, 1, 1,'Student', '2015-01-12', '10 ', '1', '15:00');
insert into tickets values (19, 7, 2,'VIP', '2015-01-11', '15', '2', '21:00');
insert into tickets values (18, 1, 3,'Adult', '2015-02-21', '12', '2', '15:00');
insert into tickets values (17, 19, 4,'Adult', '2015-03-25', '12', '1', '18:00');

您尚未显示

票证的任何模式（或数据）

，

预订

虽然未在查询中使用，但已显示其模式和数据，因此我只能猜测您想要什么

也就是说，这是您的查询（我相信）语法问题得到纠正：

select 
  10 as [total seats in a row],
  perName as [movie name],
  seatRow as [seat row],
  count(s.seatNo) - 10 as [seats left in a row],
  count(s.seatNo) filledSeats
FROM seats as s
join tickets as t on s.seatNo = t.seatNo
join performances as p on t.perID = p.perID 
where screenNo = '2'
AND perName = '50 shades of Grey'
group by perName, seatRow

关于您报告的错误，您会得到该错误，因为一旦您给一个表一个别名，该表就会被有效地重命名，以便查询到该别名，因此您不能引用完整的表名

将

performance.perName

更改为

p.perName

您可以尝试类似的方法

SELECT
 s.seatType,
 COUNT(*) as [total seats in a row],
 perName as [movie name],
 seatRow as [seat row],
 COUNT(*) - SUM(CASE WHEN t.perID IS NOT NULL THEN 1 ELSE 0 END) as [seats left in a row],
 SUM(CASE WHEN t.perID IS NOT NULL THEN 1 ELSE 0 END) filledSeats
 FROM performances as p
    INNER JOIN seats as s
ON s.screenNo = p.screenNo
LEFT JOIN 
    (
        SELECT b.perid ,t.seatNo
        FROM bookings b
        INNER JOIN tickets as t 
        ON  t.bookingid = b.bookingid
    )T
 ON s.seatNo = t.seatNo
    AND T.perid = p.perid
 WHERE p.perid = 1
 GROUP BY perName, s.seatType,seatRow

你可以看看这个

我更改了一些输入数据，因为相关ID不正确。架构有冗余列

您的
```
seats
```
表引用了
```
screen
```
表，并且在FK
```
screenNo
```
之外还有一个
```
screen
```
列
```
Tickets
```
既有FK to performance，也有booking（这反过来又有FK to performance）。这些列看起来也是多余的（
```
ticketDate、screen和pertime
```
）
```
性能
```
表中的
```
位置
```
看起来是
```
屏幕
```
的一个属性，或者是另一个位置特定的表，应该由
```
屏幕
```
引用

在

（filledSeats-10）作为[一排中的左侧座位]

之后，

将丢失

```
filledSeats
```
在您的表中不是有效字段，那么它来自哪里？
如果它是下一个字段，它应该再次是
```
count（s.seatNo）
```
，因为您不能在当前查询中使用别名
```
screenNo
```
也不是查询中的有效字段，因为它需要一个前缀来确定它来自哪里，如
```
s.screenNo
```
或
```
p.screenNo
```
如果在
```
select
```
之后有一个类似
```
seatRow
```
的字段，而没有任何聚合函数，那么也应该在
```
groupby
```
之后调用它

select 
    10 as [total seats in a row],
    perName as [movie name],
    seatRow as [seat row],
    (count(s.seatNo) - 10) as [seats left in a row],
    count(s.seatNo) as filledSeats  
FROM 
     seats as s inner join 
     tickets as t on s.seatNo = t.seatNo inner join 
     performances as p on t.perID = p.perID 
 where 
     p.screenNo = '2' AND 
     perName = '50 shades of Grey'
 group by 
     perName, seatRow

total seats in a row | movie name           | seat row | seats left in a row | filledSeats
---------------------+----------------------+----------+---------------------+------------
10                   | 50 Shades of Grey    | F        | -9                  | 1

（count（s.seatNo）-10）

（10-count（s.seatNo））

-9

票据添加架构和示例数据吗？嗨，波希米亚人，请检查我更新的帖子