SQL query stops working if column repeats - sql

Question

I have a Datagridview like this:
Model day1 day2 day3
car 1 2 4
bike 2 3 5
ship 6 1 7
Then i save it in my database table like this:
date model qty id
day1 car 1 1
day2 car 2 2
day3 car 4 3
day1 bike 2 4
day2 bike 3 5
day3 bike 5 6
day1 ship 6 7
day2 ship 1 8
day3 ship 7 9
Then using this query:
Select Min(id) As id,model From table Group By model order by id
i get the list of models in the same order as i had them in the datagridview:
car
bike
ship
The problem comes when i save 2 models with the same name in the table and then execute my query,i expect to get this:
1 car
2 bike
3 ship
4 car
but instead i get this:
1 car
2 bike
3 ship
The second proble with the current design i have is, if somehow i manage to retrieve the list as in the datagrid view:
car
bike
ship
car
How im going to know which quantities are from the first "car" and which ones are from the last "car" so i can put them in the datagridview back again.
In resume, i want to show in the datagrid the info in the same order i had it when i save it, but i dont know if the problem is the design of my table or the query im doing.
Example:
Saving this in my table, and then doing a query to get the same info in the same format:
Model day1 day2 day3
car 1 2 4
bike 2 3 5
ship 6 1 7
car 1 2 4

Answer 1

The problem is your query, you are grouping by the model
This means it will get the minimum Id of all the cars of that model, so you have car twice, but it only shows once because it groups all records of model car and selects the minimum Id which will be 1
Try this:
Select Count(id) As ModelCount,model From table Group By model order by id
on your dataset with the four cars and you will find that it will return the following:
ModelCount | model
2 | car
1 | bike
1 | ship

Answer 2

Based on your description, this is a gaps-and-island problem, sort-of. Actually, it is a data representation problem. Why are you storing the data with a single id instead of a row id and column id?
Given the way you are sorting the data, you can subtract a sequence to identify groups. Then you can group by and get the original rows:
select model
from (select t.*, row_number() over (partition by model order by id) as seqnum
from t
) t
group by model, (id - seqnum)
order by min(id);
But let me emphasize that if you want row/column information, then that is what you should be storing in the database.