SQL查询-将行值作为列返回

Question

I have a table:

Part    X   Y   
ABC     1   10  
ABC     2   20  
ABC     3   30  
ABC     4   40  
ABC     5   x   
ABC     6   x   
XYZ     1   50  
XYZ     2   60  
XYZ     3   70  
XYZ     4   80  
XYZ     5   x   
XYZ     6   x   
ETC     1   90  
ETC     2   100 
ETC     3   110 

Id like to select this data in the following way:

Part    1   2   3   4
ABC     10  20  30  40
XYZ     50  60  70  80
ETC     90  110 120 130

Is this possible?

Notes:

• Header for results = 1,2,3,4 = Field x from the table
• FieldX contains values 1 - 18, I'm only interested in 1-4
• I'd later like to also Join this to a product table where I'll be able to specify the results based on the product.Supplier field.

I think Subqueries may be the way to go but not experienced in this area.

Thanks for any help offered

Answer 1

I'm only posting this as the previous answers seem way off. Without knowing your RDBMS , you can use MAX with CASE :

SElECT part,
    MAX(CASE WHEN X = 1 THEN Y END) Y1,
    MAX(CASE WHEN X = 2 THEN Y END) Y2,
    MAX(CASE WHEN X = 3 THEN Y END) Y3,
    MAX(CASE WHEN X = 4 THEN Y END) Y4
FROM YourTable
GROUP BY part

If you're RDBMS will support it, you can use the PIVOT command.