问题
FacilityTable
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
BookingTable
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
Expected Result (after insert &n -> Year 2016)
FACILITYNAME count_times MONTH
Toilet 1 5
Computer Lab 1 4
On this code I , when runtime is used (&n) and I entered 2016' it will show the expected table that I have provided above.
Below is my code ( but ended up error/duplicate , appearing the data even is not the year I have inserted (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 ))
回答1:
No problem seems with proper formatting (using quotes & to_date whenever needed) :
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)
来源：https://stackoverflow.com/questions/49561045/oracle-runtime-and-show-data-based-on-inserted-year-not-duplicate