Create PostgreSQL view to feed a chart generating tool having filter option - postgresql

Question

We need to create a postgres SQL view to generate a chart. Chart creating tool allow only a single SQL view as input. The chart has the filter option by studentname, cousecode and feecode. Other than the chart display, we need to show the sum of the total course fee and fee amount paid by all the students from the same view.
table1: student
id name address
1 John USA
2 Robert UK
3 Tinger NZ
table2: student_course
id std_id coursecode fee
1 1 CHEM 3000
2 1 PHY 4000
3. 1 BIO 2000
4. 2 CHEM 3000
5. 2 GEO 1500
6. 3 ENG 2000
table3: student_fees
id std_name coursecode feecode amount
1 1 CHEM BKFEE 100
2 1 CHEM SPFEE 140
3 1 CHEM MATFEE 250
4 1 PHY BKFEE 150
5 1 PHY SPFEE 200
6 1 BIO LBFEE 300
7 1 BIO MATFEE 350
9 1 BIO TECFEE 200
10 2 CHEM BKFEE 100
11 2 CHEM SPFEE 140
12 2 GEO BKFEE 150
13 3 ENG BKFEE 75
14 3 ENG SPFEE 140
15 3 ENG LBFEE 180
Am able to create a view like this. But this view is not enough for my operation. Because from this view I couldn't calculate the sum of the total course fee(course fee is repeating). In this case, the grouping will not work. Because of the need to filter the data by studentname,coursecode and feecode.
View:
id std_id coursecode course_fee feecode fee_amount
1 John CHEM 3000 BKFEE 100
2 John CHEM 3000 SPFEE 140
3 John CHEM 3000 MATFEE 250
4 John PHY 4000 BKFEE 150
5 John PHY 4000 SPFEE 200
6 John BIO 4000 LBFEE 300
7 John BIO 4000 MATFEE 350
8 John BIO 4000 TECFEE 200
9 Robert CHEM 3000 BKFEE 100
10 Robert CHEM 3000 SPFEE 140
11 Robert GEO 1500 BKFEE 150
12 Tinger ENG 2000 BKFEE 75
13 Tinger ENG 2000 SPFEE 140
14 Tinger ENG 2000 LBFEE 180
So in any way can we create a view like this ?
View:
id std_id coursecode course_fee feecode fee_amount
1 John CHEM 3000 BKFEE 100
2 John CHEM 0 SPFEE 140
3 John CHEM 0 MATFEE 250
4 John PHY 4000 BKFEE 150
5 John PHY 0 SPFEE 200
6 John BIO 4000 LBFEE 300
7 John BIO 0 MATFEE 350
8 John BIO 0 TECFEE 200
9 Robert CHEM 3000 BKFEE 100
10 Robert CHEM 0 SPFEE 140
11 Robert GEO 1500 BKFEE 150
12 Tinger ENG 2000 BKFEE 75
13 Tinger ENG 0 SPFEE 140
14 Tinger ENG 0 LBFEE 180
Any help appreciated...

Answer 1

I guess you are looking for rollup functionality in your view query i am shearing you 2 links fist one is for the basics how rollup works and the 2nd one is specific to Postgresql
first link , second link Hope this will help you
I have work out one demo for you please check rollup query

Answer 2

Not similar to the answer you are expecting but you can explore GROUPING SET
select name, sf.coursecode, amount, sum(fee)
from student s, student_course sc, student_fees sf
where s.id = sc.std_id
and sf.std_name = s.id
and sf.coursecode = sc.coursecode
group by
GROUPING SETS (
(name, sf.coursecode, amount, fee),
(name, sf.coursecode, fee),
()
)
order by name, sf.coursecode asc