Mysql, 3 tables 2 group by - mysql

Question

I have 3 tables, student, family and fee. Some families have more than one kid. Fees are recorded in fee table. Families makes many payments through the year.
I want to group the number of kids by family and get the total amount paid by each family.
My Qyery:
SELECT student.Family_ID, family.Family_Name, count(*) as kids_numb, sum (Amount) as Paid_Amount
FROM student, family, fee
WHERE student.Family_ID = family.Family_ID
AND fee.Family_ID = family.Family_ID
AND student.Status ='1'
GROUP BY student.Family_ID;
I need to sort Something like:
Family Name | # of kids | Fees | Paid | Balance
----------------------------------------------------
Lebon | 1 | 425 | 200 | 225
Lavoix | 2 | 700 | 150 | 550
Napper | 1 | 425 | 0 | 425
Major | 3 | 900 | 300 | 600

Answer 1

UPDATED based on your comments.
Try it this way
SELECT m.family_id, m.family_name, s.kids_numb, COALESCE(f.paid_amount, 0) paid_amount
FROM family m LEFT JOIN
(
SELECT family_id, COUNT(*) kids_numb
FROM student
WHERE status = 1
GROUP BY family_id
) s
ON m.family_id = s.family_id LEFT JOIN
(
SELECT family_id, SUM(amount) paid_amount
FROM fee
GROUP BY family_id
) f
ON m.family_id = f.family_id
WHERE s.family_id IS NOT NULL
Sample output:
| FAMILY_ID | FAMILY_NAME | KIDS_NUMB | PAID_AMOUNT |
|-----------|-------------|-----------|-------------|
| 1 | Lebon | 1 | 200 |
| 2 | Lavoix | 2 | 150 |
| 3 | Napper | 1 | 0 |
| 4 | Major | 3 | 300 |
Here is SQLFiddle demo
UPDATE2: to add a grand total
SELECT family_id, family_name, SUM(kids_numb) kids_numb, SUM(paid_amount) paid_amount
FROM
(
SELECT m.family_id, m.family_name, s.kids_numb, COALESCE(f.paid_amount, 0) paid_amount
FROM family m LEFT JOIN
(
SELECT family_id, COUNT(*) kids_numb
FROM student
WHERE status = 1
GROUP BY family_id
) s
ON m.family_id = s.family_id LEFT JOIN
(
SELECT family_id, SUM(amount) paid_amount
FROM fee
GROUP BY family_id
) f
ON m.family_id = f.family_id
WHERE s.family_id IS NOT NULL
) q
GROUP BY family_id, family_name WITH ROLLUP
HAVING (family_id IS NOT NULL AND
family_name IS NOT NULL)
OR (family_id IS NULL AND
family_name IS NULL)
Sample output:
| FAMILY_ID | FAMILY_NAME | KIDS_NUMB | PAID_AMOUNT |
|-----------|-------------|-----------|-------------|
| 1 | Lebon | 1 | 200 |
| 2 | Lavoix | 2 | 150 |
| 3 | Napper | 1 | 0 |
| 4 | Major | 3 | 300 |
| (null) | (null) | 7 | 650 |
MySQL GROUP BY non-standard extension will allow you to change this whole part
GROUP BY family_id, family_name WITH ROLLUP
HAVING (family_id IS NOT NULL AND
family_name IS NOT NULL)
OR (family_id IS NULL AND
family_name IS NULL)
with just
GROUP BY family_id WITH ROLLUP
but then instead of NULL in family_name column for a total row you'll have a value of last family name.
Sample output:
| FAMILY_ID | FAMILY_NAME | KIDS_NUMB | PAID_AMOUNT |
|-----------|-------------|-----------|-------------|
| 1 | Lebon | 1 | 200 |
| 2 | Lavoix | 2 | 150 |
| 3 | Napper | 1 | 0 |
| 4 | Major | 3 | 300 |
| (null) | Major | 7 | 650 |
Here is SQLFiddle demo