Question

Here is my data:

ID 
Model  
Year  

1    
Civic      
2008

1    
Accord   
2010

2    
Mustang 
2011

3    
Tahoe    
2011

I would like to get this result:

ID 
Model1  
Year1  
Model2  
Year2  

1    
Civic      
2008     
Accord     
2010     

2    
Mustang 
2011

3    
Tahoe    
2011

Up to 4 cars can be present under each ID and no more. I have spent a lot of time researching this but have not found a good solution that fits my example exactly. Perhaps because I don’t know how exactly to word my search. Thanks…

Answer 1

There’s not a really great way to do this in SQL. You might try and struggle with a pivot table, but each entity would need a sequence.

Your best bet would be to arrange it how you want in your output language which will have much better tools available for this sort of thing.

Add a column to each row called sequence (which has 1, 2, 3, and 4)

SELECT
id,
Max(case when seq = 1 then model end) as model1,
max(case when seq = 1 then year end) as year1,
Max(case when seq = 2 then model end) as model2,
max(case when seq = 2 then year end) as year2,
Max(case when seq = 3 then model end) as model3,
max(case when seq = 3 then year end) as year3,
Max(case when seq = 4 then model end) as model4,
max(case when seq = 4 then year end) as year4
group by id