Oracle

Question

设施表

FACILITYNO    FACILITYNAME
'FACNO01'        Toilet
'FACNO02'       Staff Office
'FACNO03'     Principle Office
'FACNO04'       Science Lab
'FACNO05'       Math Lab
'FACNO06'       Computer Lab
'FACNO07'        Biology Lab
'FACNO08'       Chemical Lab

预订表

FACILITYNO  bookingID       userID     Timebooked  
'FACNO01'       1             0003    10-May-2016       
'FACNO04'       2             0001    10-May-2018    
'FACNO05'       3             0001    10-Apr-2017
'FACNO01'       4             0001    10-Apr-2017
'FACNO02'       5             0003    10-Jan-2011
'FACNO04'       6             0006    10-Apr-2018
'FACNO06'       7             0003    10-Apr-2016
'FACNO07'       8             0006    10-Apr-2015
'FACNO08'       9             0001    10-Apr-2017

预期结果（插入 &n 后 -> 2016 年）

FACILITYNAME  count_times  MONTH
Toilet          1            5
Computer Lab    1            4

在此代码 I 上，当使用运行时 (&n) 并且我输入 2016' 时，它将显示我在上面提供的预期 table。

下面是我的代码（但最终是 error/duplicate ，出现的数据甚至不是我插入的年份 (2016) ）

SELECT f.FACILITYNAME,COUNT(*) AS count_times, EXTRACT (MONTH FROM b.Timebooked ) AS MONTHS
FROM BookingTable b
JOIN FacilityTable f ON b.FACILITYNO = f.FACILITYNO
WHERE TO_CHAR(b.Timebooked , 'YYYY') = &n
GROUP BY (EXTRACT (MONTH FROM b.Timebooked )),f.FACILITYNAME
ORDER BY (EXTRACT (MONTH FROM b.Timebooked ))

Answer 1

正确格式化似乎没有问题（在需要时使用 quotes & to_date）：

create table FacilityTable (FACILITYNO varchar2(30), FACILITYNAME varchar2(30));
insert into FacilityTable values('FACNO01','Toilet');
insert into FacilityTable values('FACNO02','Staff Office');
insert into FacilityTable values('FACNO03','Principle Office');
insert into FacilityTable values('FACNO04', 'Science Lab');
insert into FacilityTable values('FACNO05','Math Lab');
insert into FacilityTable values('FACNO06','Computer Lab');
insert into FacilityTable values('FACNO07','Biology Lab');
insert into FacilityTable values('FACNO08','Chemical Lab');


create table BookingTable (FACILITYNO varchar2(30),bookingID int, userID varchar2(30), Timebooked date);
insert into BookingTable values('FACNO01',1,'0003',to_date('10-May-2016','dd-Mon-yyyy'));       
insert into BookingTable values('FACNO04',2,'0001',to_date('10-May-2018','dd-Mon-yyyy'));    
insert into BookingTable values('FACNO05',3,'0001',to_date('10-Apr-2017','dd-Mon-yyyy'));
insert into BookingTable values('FACNO01',4,'0001',to_date('10-Apr-2017','dd-Mon-yyyy'));
insert into BookingTable values('FACNO02',5,'0003',to_date('10-Jan-2011','dd-Mon-yyyy'));
insert into BookingTable values('FACNO04',6,'0006',to_date('10-Apr-2018','dd-Mon-yyyy'));
insert into BookingTable values('FACNO06',7,'0003',to_date('10-Apr-2016','dd-Mon-yyyy'));
insert into BookingTable values('FACNO07',8,'0006',to_date('10-Apr-2015','dd-Mon-yyyy'));
insert into BookingTable values('FACNO08',9,'0001',to_date('10-Apr-2017','dd-Mon-yyyy'));

SELECT f.FACILITYNAME,COUNT(*) AS count_times, EXTRACT (MONTH FROM b.Timebooked ) AS MONTHS
FROM BookingTable b
JOIN FacilityTable f ON b.FACILITYNO = f.FACILITYNO
WHERE TO_CHAR(b.Timebooked , 'YYYY') = &n
GROUP BY (EXTRACT (MONTH FROM b.Timebooked )),f.FACILITYNAME
ORDER BY (EXTRACT (MONTH FROM b.Timebooked ));

FACILITYNAME    COUNT_TIMES MONTHS
Computer Lab           1    4
Toilet                 1    5

Demo(2016 directly substituted for &n)

Oracle - 运行时并根据插入的年份显示数据（不重复）

Oracle - runtime and show data based on inserted year ( not duplicate )

sql

oracle11g

sqlfiddle