I have two tables:
Attendance Table
ID student_roll sem class_id
1 314 7 1
2 315 7 1
3 316 7 1
4 314 7 2
5 315 7 2
6 314 7 3
7 315 7 3
8 316 7 3
9 314 7 4
10 315 7 4
11 316 7 4
Class Table
class_id course t_id date
1 MC 2 14/3/14
2 MC 2 15/3/14
3 C 2 16/3/14
4 MC 2 17/3/14
In the attendance table you can see that roll no. 316 is absent in class_id 2.So suppose i want to count the no of class attended by roll no. 316 in a particular course (Here MC) how can i do so? please help me with the query...Thanks in advance:)
The following query will return the number of attendance records for a particular student (ie. student roll 316), with respect to a given class (ie. 'MC')
SELECT COUNT(*) as ClassCount
FROM attendance A
INNER JOIN class_table C
ON A.class_id = C.class_id
WHERE A.student_roll = 316
AND C.course = 'MC'
Related
I'm pretty new to joinings and advanced querying, what I want to do is to join three tables to make an summary of how many hours an employee has spent on courses (course data is omitted from examples).
!-SQL query is below the example table-!
The query must show:
A unique set of employee name.
Their individual allocated hours.
A sum of their hours spent
And return a final new column showing the allowance left.
"employees" table
id
employee_id
1
"Annachiara Darius"
2
"Samar Rajani"
3
"Taonga Eric"
4
"Tycho Sigdag"
5
"Naevius Matvei"
6
"Theophania Eglantine"
7
"Boro Stanislav"
"accounting" table where hours are recorded
id
employee_id
hours_done
1
1
2.50
2
1
2.80
3
2
5.60
4
2
3.30
5
4
4.50
6
5
8.90
7
6
7.60
8
3
6.50
9
7
1.00
10
5
10.30
11
7
11.50
12
5
5.60
13
7
100.00
14
2
30.00
"allocation" table
id
employee_id
hours_allocated
1
1
12
2
2
16
3
3
20
4
4
15
5
5
10
6
6
7
7
7
8
SELECT ACCOUNTING.EMPLOYEE_ID AS EMPLOYEE_ID,
EMPLOYEE.EMPLOYEE_NAME AS EMPLOYEE_NAME,
ALLOCATED.HOURS_ALLOCATED,
SUM(ACCOUNTING.HOURS_DONE) AS HOURS_SPENT,
SUM(ALLOCATED.HOURS_ALLOCATED - ACCOUNTING.HOURS_DONE) AS ALLOWANCE
FROM PUBLIC.ACCOUNTING ACCOUNTING
INNER JOIN
(SELECT EMPLOYEE_NAME,
EMPLOYEE_ID
FROM PUBLIC.EMPLOYEES GROUP
BY EMPLOYEE_ID) EMPLOYEE ON EMPLOYEE.EMPLOYEE_ID = ACCOUNTING.EMPLOYEE_ID
INNER JOIN
(SELECT HOURS_ALLOCATED,
EMPLOYEE_ID
FROM PUBLIC.ALLOCATION GROUP
BY EMPLOYEE_ID,
HOURS_ALLOCATED) ALLOCATED ON ALLOCATED.EMPLOYEE_ID = ACCOUNTING.EMPLOYEE_ID GROUP
BY ACCOUNTING.EMPLOYEE_ID,
EMPLOYEE_NAME,
ALLOCATED.HOURS_ALLOCATED
ORDER
BY EMPLOYEE_NAME ASC
Result from the query above
employee_id
employee_name
hours_allocated
hours_spent
allowance
1
"Annachiara Darius"
12
5.3
18.7
7
"Boro Stanislav"
8
112.5
-88.5
5
"Naevius Matvei"
10
24.8
5.2
2
"Samar Rajani"
16
38.9
9.1
3
"Taonga Eric"
20
6.5
13.5
6
"Theophania Eglantine"
7
7.6
-0.6
4
"Tycho Sigdag"
15
4.5
10.5
As you can see I've managed to get every column displaying the information I wanted correctly.
The problem:
Allowence column is only correct if the employee has only made one entry in the accounting table.
If employee has more than one entry in accounting the calculation is off/wrong.
The line I use to get the allowance is
SUM(ALLOCATED.HOURS_ALLOCATED - ACCOUNTING.HOURS_DONE) AS ALLOWANCE
I've been trying different stuff but can't seem to manage this part of the query.
How can I incorporate this into the group logic?
The answer was posted in a comment.
ALLOCATED.HOURS_ALLOCATED - SUM(ACCOUNTING.HOURS_DONE) is correct
but not
`SUM(ALLOCATED.HOURS_ALLOCATED - ACCOUNTING.HOURS_DONE)` AS ALLOWANCE
I got two tables. One with a bill of material and one with purchasing orders. Now I want to display the full bill of material of a product with the total on order amounts from the table purchasing.
**Billofmaterials**
BOM_ID BOM_Prod_id BOM_item_id
1 5 11
2 5 13
3 6 11
4 6 15
5 6 20
Example prod_id (product id) 6 has 3 items (id 11, 15 and 20).
**Purchasing**
PU_ID PU_item_id PU_amount PU_status
1 11 100 On order
2 11 650 On order
3 11 40 Received
4 20 600 On order
5 8 10 On order
6 15 150 Received
Now i got the following SQL
SELECT
BOM_item_id,
SUM(DISTINCT purchasing.PU_amount) as total_on_order
FROM Billofmaterials
LEFT JOIN purchasing
ON Billofmaterials.BOM_item_id= purchasing.PU_item_id
AND purchasing.PU_status != 'Received'
AND BOM_prod_id = 6
GROUP BY BOM_item_id
This query returns the following:
**Query result**
BOM_item_id total_on_order
11 750
20 600
Because there is only one received purchase order for BOM_item_id 15 it doesn't return a value. Now i want to retun BOM_item_id 15 also but with a total_on_order as 0 like:
**Expected result**
BOM_item_id total_on_order
11 750
15 0
20 600
What SQL feature/function do I need to use to get the expected result?
You can try the below -
SELECT BOM_item_id,coalesce(total_on_order,0) as total_on_order
FROM Billofmaterials left join
(
select PU_item_id,SUM(purchasing.PU_amount) as total_on_order
from purchasing
where purchasing.PU_status != 'Received'
group by PU_item_id
) purchasing
ON Billofmaterials.BOM_item_id= purchasing.PU_item_id
where BOM_prod_id = 6
Thanks in advance for any assistance you can provide. I have spent hours on this with no luck.
I'm working with an indented bill of material table which has an end part id, a sequence number, a level and a quantity. The goal is to determine the total cumulative quantity of each row on this table.
What makes this difficult is that to determine the total quantity, the child quantity needs to be multiplied by it's parent quantity. The parent quantity of that parent needs to be multiplied by it's parent quantity and so on.
For example, a level 3 part has a component quantity of 5. It's parent the level 2 part has a component quantity of 2. It's parent the level 1 part has a component quantity of 3. This means the level 3 part total quantity is 30 (3 X 2 X 5).
With the assistance of SO (specifically #KKK) the parent quantity was able to be calculated in the below query. After this was resolved I realized I now need two additional columns, one that shows the Rolled/Cumulative quantities of the parent rows and one that shows the total quantity of the child.
The attached screenshot has the two columns that need to be added highlighted in yellow. Here is the current SQL (using Oracle 10.2) for the columns that are not in yellow:
select
end_part_id, sort_seq_no, indented_lvl, comp_qty,
(select distinct first_value(a.comp_qty) over (order by a.sort_seq_no desc, TRIM(a.indented_lvl) desc)
from
report_table a
where
a.end_part_id = b.end_part_id
and a.sort_seq_no < b.sort_seq_no
and TRIM(a.indented_lvl) < TRIM(b.indented_lvl)) as "PARENT_QTY"
from report_table b
Expected Results
END_PART_ID SORT_SEQ_NO INDENTED_LVL COMP_QTY PARENT_QTY ROLLED_PARENT QTY TOTAL_QTY
PARTX 1 1 2 1 1 2
PARTX 2 2 5 2 2 10
PARTX 3 3 2 5 10 20
PARTX 4 4 1 2 20 20
PARTX 5 5 1 1 20 20
PARTX 6 6 1 1 20 20
PARTX 7 5 4 1 20 80
PARTX 8 6 1 4 80 80
PARTX 9 2 7 2 2 14
PARTX 10 3 2 7 14 28
PARTX 11 3 2 7 14 28
PARTX 12 4 1 2 28 28
PARTX 13 4 1 2 28 28
PARTX 14 3 8 7 14 112
PARTX 15 1 1 1 1 1
PARTX 16 2 7 1 1 7
PARTX 17 3 2 7 7 14
PARTX 18 3 2 7 7 14
PARTX 19 4 1 2 14 14
PARTX 20 4 1 2 14 14
The code I have for this is
select name
from employee e, workon w
where e.empid = w.empid
and pid in
(select pid
from workon
where did in
(select did
from employee ee
where e.did = ee.did))
group by name
But I know that isn't right, since I also need to find someone who works in a project outside of his division. The problem is that I'm not too sure how to do that.
Tables
Employee
EMPID NAME SALARY DID
1 kevin 32000 2
2 joan 46200 1
3 brian 37000 3
4 larry 82000 5
5 harry 92000 4
6 peter 45000 2
7 peter 68000 3
8 smith 39000 4
9 chen 71000 1
10 kim 46000 5
11 smith 46000 1
Workon
PID EMPID HOURS
3 1 30
2 3 40
5 4 30
6 6 60
4 3 70
2 4 45
5 3 90
3 3 100
6 8 30
4 4 30
5 8 30
6 7 30
6 9 40
5 9 50
4 6 45
2 7 30
2 8 30
2 9 30
1 9 30
1 8 30
1 7 30
1 5 30
1 6 30
2 6 30
Project
PID PNAME BUDGET DID
1 DB development 8000 2
2 network development 6000 2
3 Web development 5000 3
4 Wireless development 5000 1
5 security system 6000 4
6 system development 7000 1
select e.name
from employee e
where
-- Projects in department
exists (
select *
from
workon w
join project p
on w.pid = p.pid
and p.did = e.did
where w.empid = e.empid
)
-- Projects out of department
and exists (
select *
from
workon w
join project p
on w.pid = p.pid
and p.did != e.did
where w.empid = e.empid
)
I am using the following statement;
SELECT RESV_ID, BOOKING_CUS_ID, ACC_ID,
(SELECT F.FLI_PRICE FROM FLIGHT F WHERE F.FLI_ID = R.IN_FLIGHT_ID) AS DEPART_FLIGHT_PRICE,
(SELECT F1.FLI_PRICE FROM FLIGHT F1 WHERE F1.FLI_ID = R.OUT_FLIGHT_ID) AS RETURN_FLIGHT_PRICE,
(SELECT AC.ACC_PRICEPN FROM ACCOMMODATION AC WHERE AC.ACC_ID = R.ACC_ID) AS ACCOMMODATION_PRICE
FROM HOLIDAY_RESERVATION R;
to yield the following results;
RESV_ID BOOKING_CUS_ID ACC_ID DEPART_FLIGHT_PRICE RETURN_FLIGHT_PRICE ACCOMMODATION_PRICE
---------- -------------- ---------- ------------------- ------------------- -------------------
1 1 2 520 450 350
2 3 4 250 150 150
3 5 6 290 300 450
4 7 7 399 450 650
5 9 365 345
6 11 558 460
7 13 250 250
8 15 550 550
9 17 25 250
10 19 19 450
10 rows selected.
Question:
How do I sum up the price fields, SOME PRICES ARE NOT AVAILABLE because a reservation was either made for accommodation only or flight only, hence both values will not be present always and this is where the issue lies
DEPART_FLIGHT_PRICE RETURN_FLIGHT_PRICE ACCOMMODATION_PRICE
Furthermore:
I wish to insert or update the SUM of those three values into a SUBTOTAL in the reservation table, perhaps by using select into or update, I have spent a whole day trying to do this but my skills are limited. any help will be greatly appreciated.
Flight table
FLI_ID FLI_CO FLI_AIRCRA DEPT_AIRPORT ARRV_AIRPORT DEPT_TIME ARRV_TIME FLI_PRICE
1 BD425 Boeing 707 1 12 18-MAR-12 02.24.00 AM 18-MAR-12 06.24.00 AM 520
2 LX345 Beriev 30 6 7 20-MAR-12 03.30.00 PM 20-MAR-12 04.20.00 PM 250
3 NZ4445 Boeing 720 9 14 25-MAR-12 09.00.00 AM 25-MAR-12 05.00.00 PM 290
4 TP351 Boeing 767 10 15 25-MAR-12 11.25.00 AM 25-MAR-12 03.35.00 PM 399
5 BA472 Boeing 720 5 14 26-MAR-12 01.05.00 PM 26-MAR-12 04.15.00 PM 365
Accommodation
ACC_ID ACC_TYPE_CODE ACC_DESC ACC_PRICEPN ACC_ROOMS RESORT_ID ACC_ADDR CITY_ID
1 1 Three bedroom bungalow near theme park 500 3 1
2 1 Two bedroom bungalow next to disney house 350 2 1
3 1 One bedroom bungalow with lake view 250 2 2
4 2 One bedroom chalet near the lake 150 1 2
5 2 Four bedroom chalet near the tree house 600 4 3
Reservation
RESV_ID EMP_ID BOOKING_CUS_ID RESV_DATE HOLIDAY_S HOLIDAY_E IN_FLIGHT_ID OUT_FLIGHT_ID IN_FLIGHT_SEATS_NO OUT_FLIGHT_SEATS_NO ACC_ID SUBTOTAL
1 338 1 16-FEB-12 18-MAR-12 20-APR-12 1 11 2 2 2
2 335 3 10-JAN-12 20-MAR-12 22-APR-12 2 12 2 2 4
3 338 5 05-MAR-12 25-MAR-12 26-APR-12 3 13 2 2 6
4 328 7 02-JAN-12 25-MAR-12 25-APR-12 4 14 2 2 7
5 311 9 20-JAN-12 26-MAR-12 21-APR-12 5 15 2 2
6 317 11 07-JAN-12 27-MAR-12 22-APR-12 6 16 2 2
7 344 13 29-FEB-12 15-MAR-12 12-APR-12 7 17 2 2
8 326 15 11-JAN-12 18-MAR-12 12-APR-14 8 18 2 2
9 329 17 16-JAN-12 19-MAR-12 17-APR-12 25
10 323 19 18-FEB-12 20-MAR-12 21-APR-12 19
Okay I managed to yield the results that i wanted
SELECT HR.RESV_ID, F_IN.FLI_ID, F_IN.FLI_PRICE, F_OUT.FLI_ID, F_OUT.FLI_PRICE, AC.ACC_ID, AC.ACC_PRICEPN, NVL(F_IN.FLI_PRICE,0)+NVL(F_OUT.FLI_PRICE,0)+NVL(AC.ACC_PRICEPN,0) AS TOTAL
FROM HOLIDAY_RESERVATION HR
LEFT JOIN FLIGHT F_IN ON HR.IN_FLIGHT_ID = F_IN.FLI_ID
LEFT JOIN FLIGHT F_OUT ON HR.OUT_FLIGHT_ID = F_OUT.FLI_ID
LEFT JOIN ACCOMMODATION AC ON HR.ACC_ID = AC.ACC_ID
ORDER BY HR.RESV_ID;
YIELDS
RESV_ID FLI_ID FLI_PRICE FLI_ID FLI_PRICE ACC_ID ACC_PRICEPN TOTAL
---------- ---------- ---------- ---------- ---------- ---------- ----------- ----------
1 1 500 11 555 2 350 1405
2 2 150 12 253 4 150 553
3 3 300 13 345 6 450 1095
4 4 450 14 343 7 650 1443
5 5 345 15 242 587
6 6 460 16 460 920
7 7 250 17 250 500
8 8 550 18 550 1100
9 25 250 250
10 19 450 450
And the following statement is to update the reservation table.
Thanks to Leigh Riffel from DBA stackxchange for the following code
UPDATE HOLIDAY_RESERVATION R SET SUBTOTAL =
NVL((SELECT F.FLI_PRICE FROM FLIGHT F WHERE F.FLI_ID = R.IN_FLIGHT_ID), 0) +
NVL((SELECT F.FLI_PRICE FROM FLIGHT F WHERE F.FLI_ID = R.OUT_FLIGHT_ID), 0) +
NVL((SELECT AC.ACC_PRICEPN FROM ACCOMMODATION AC WHERE AC.ACC_ID = R.ACC_ID), 0);
Now the subtotal is populated with the values obtained from the sum performed above >>
RESV_ID EMP_ID BOOKING_CUS_ID RESV_DATE HOLIDAY_S HOLIDAY_E IN_FLIGHT_ID OUT_FLIGHT_ID IN_FLIGHT_SEATS_NO OUT_FLIGHT_SEATS_NO ACC_ID SUBTOTAL
---------- ---------- -------------- --------- --------- --------- ------------ ------------- ------------------ ------------------- ---------- ----------
1 338 1 16-FEB-12 18-MAR-12 20-APR-12 1 11 2 2 2 1405
2 335 3 10-JAN-12 20-MAR-12 22-APR-12 2 12 2 2 4 553
3 338 5 05-MAR-12 25-MAR-12 26-APR-12 3 13 2 2 6 1095
4 328 7 02-JAN-12 25-MAR-12 25-APR-12 4 14 2 2 7 1443
5 311 9 20-JAN-12 26-MAR-12 21-APR-12 5 15 2 2 587
6 317 11 07-JAN-12 27-MAR-12 22-APR-12 6 16 2 2 920
7 344 13 29-FEB-12 15-MAR-12 12-APR-12 7 17 2 2 500
8 326 15 11-JAN-12 18-MAR-12 12-APR-14 8 18 2 2 1100
9 329 17 16-JAN-12 19-MAR-12 17-APR-12 25 250
10 323 19 18-FEB-12 20-MAR-12 21-APR-12 19 450
Subsequently the code was added to a trigger (which was the original intention)
CREATE OR REPLACE TRIGGER HR_SUBTOTAL
BEFORE INSERT OR UPDATE ON HOLIDAY_RESERVATION
FOR EACH ROW
BEGIN
SELECT
NVL((SELECT F.Fli_Price FROM Flight F WHERE F.Fli_ID = :new.In_Flight_ID), 0) +
NVL((SELECT F.Fli_Price FROM Flight F WHERE F.Fli_ID = :new.Out_Flight_ID), 0) +
NVL((SELECT AC.Acc_PricePn FROM Accomodation AC WHERE AC.Acc_ID = :new.Acc_ID), 0)
INTO :new.Subtotal
FROM dual;
END;
/
For the SUM, assuming you want to treat NULL values as 0, you'd just need to do an NVL on the numbers
NVL( DEPART_FLIGHT_PRICE, 0 ) +
NVL( RETURN_FLIGHT_PRICE, 0 ) +
NVL( ACCOMMODATION_PRICE, 0 )
As for the UPDATE, it sounds like you just need a correlated UPDATE statement.
UPDATE reservation r
SET subtotal = (SELECT (SELECT NVL( DEPART_FLIGHT_PRICE, 0 ) +
NVL( RETURN_FLIGHT_PRICE, 0 ) +
NVL( ACCOMMODATION_PRICE, 0 )
FROM (SELECT RESV_ID,
BOOKING_CUS_ID,
ACC_ID,
(SELECT F.FLI_PRICE
FROM FLIGHT F
WHERE F.FLI_ID = R.IN_FLIGHT_ID) AS DEPART_FLIGHT_PRICE,
(SELECT F1.FLI_PRICE
FROM FLIGHT F1
WHERE F1.FLI_ID = R.OUT_FLIGHT_ID) AS RETURN_FLIGHT_PRICE,
(SELECT AC.ACC_PRICEPN
FROM ACCOMMODATION AC
WHERE AC.ACC_ID = R.ACC_ID) AS ACCOMMODATION_PRICE
FROM dual));
You are asking:
How do I sum up the price fields, as you can see some of them can have nulls.
DEPART_FLIGHT_PRICE RETURN_FLIGHT_PRICE ACCOMMODATION_PRICE
Just enclose them in NVL function as follows:
NVL(DEPART_FLIGHT_PRICE, 0)
and then sum them up.
For the second part, what you need is a MERGE statement. A good example is at http://www.oracle-developer.net/display.php?id=203