如何将相同的id和mrege数据组合成一个记录？

Question

I have a database structure like so:

Car
 - id   
 - carname
 - image
 - category
 - status

Parts
 - partid
 - partname

CarParts
 - carpartid
 - carid(fk)
 - partid(fk)
 - amountid(fk)

Category
 - id
 - categoryname

Amount
 - amountid
 - amountvalue

Right now this is what I am working on:

SELECT * FROM carparts
INNER JOIN car on carparts.carpartid = car.id 

INNER JOIN parts on parts.partid = carparts.carpartid

INNER JOIN amount on amount.amountid = carparts.amountid where status = 1

This returns duplicate records when there is more than one carpart in the carparts table. How can I combine the carparts.id and car.id to one row but still have multiple partname for that one record?

Answer 1

Try this.

SELECT * FROM car left join  carparts on car.id = carparts.carpartid 
left join  parts on parts.partid = carparts.carpartid
left join amount on amount.amountid = carparts.amountid where status = 1
group by car.id

Thank you.

Answer 2

You can use :

SELECT group_concat(parts.partname) as parts FROM car left join  carparts on car.id = carparts.carpartid 
left join  parts on parts.partid = carparts.carpartid
left join amount on amount.amountid = carparts.amountid where status = 1
group by car.id

Since we need to combine records, we are doing it via group by clause. Also since we need multiple records in one row, we are using group_concat to concatenate multiple results. PS : There is some limitation on number of values returned by group_concat ?