Question

I have two tables. One has order information with an order id, and the other table has order detail information. order_details has multiple rows for each order_id. I’d like a single query that would pull the order information, and then add a ‘column’ for each entry on the order_details table.

Is this possible? And if so, how?

Answer 1

This is not possible in MySQL, or in any SQL that I know of, with the exception of a highly hardcoded query with excessive joins or subqueries.

This type of problem is typically relegated to the domain of programming languages. If you have an ad-hoc need for a query to do this, then something like this would do it (you will have to quote the keyword order)

SQL example:

SELECT 
  order_id, 
  date, 
  (select amt from order_detail where order_id=order.order_id and detail_line=1),
  (select amt from order_detail where order_id=order.order_id and detail_line=2),
  (select amt from order_detail where order_id=order.order_id and detail_line=3),
  (select amt from order_detail where order_id=order.order_id and detail_line=4),
FROM 
  order
WHERE 
  order_id = 1234