SQL Join Tables

Question

Table one contains

ID|Name  
1  Mary  
2  John  

Table two contains

ID|Color  
1  Red  
2  Blue  
2  Green  
2  Black  

I want to end up with is

ID|Name|Red|Blue|Green|Black  
1  Mary Y   Y  
2  John     Y     Y     Y

Thanks for any help.

---

Thanks for the responses. I'm going to re-post this with some additional info about exactly what I'm trying to do that may complicate this. Can someone close this?

Answer 1

If you use T-SQL you can use PIVOT (http://msdn.microsoft.com/en-us/library/ms177410.aspx)

Here is query I used:

declare @tbl_names table(id int, name varchar(100))
declare @tbl_colors table(id int, color varchar(100))

insert into @tbl_names
select 1, 'Mary'
union
select 2, 'John'


insert into @tbl_colors
select 1, 'Red'
union
select 1, 'Blue'
union
select 2, 'Green'
union
select 2, 'Blue'
union
select 2, 'Black'

select name,
        case when [Red] is not null then 'Y' else '' end as Red,
        case when [Blue] is not null then 'Y' else '' end as Blue,
        case when [Green] is not null then 'Y' else '' end as Green,
        case when [Black] is not null then 'Y' else '' end as Black

from
(
select n.id, name, color from @tbl_names n
inner join @tbl_colors c on n.id = c.id
) as subq
pivot 
(
    min(id)
    FOR color IN ([Red], [Blue], [Green], [Black])
) as pvt

And here is output:

John        Y   Y   Y
Mary    Y   Y       

Answer 2

I can use a CASE statement with a subquery to input the Y values.

select ID, Name,
  case
    when exists (select * from Colors C where C.ID = N.ID and Color = 'Red') then
      'Y'
    else
      NULL
  end
,
 case
    when exists (select * from Colors C where C.ID = N.ID and Color = 'Blue') then
      'Y'
    else
      NULL
  end
,
 case
    when exists (select * from Colors C where C.ID = N.ID and Color = 'Green') then
      'Y'
    else
      NULL
  end
,
 case
    when exists (select * from Colors C where C.ID = N.ID and Color = 'Black') then
      'Y'
    else
      NULL
  end
from Names N