Question

I am supposed to rewrite a SQL-query without using a subquery.
My solution which uses a subquery is:

SELECT * from parts WHERE weight > 
(SELECT weight from parts WHERE name = 'tape-drive');

A simplified version of my table ‘parts’:

NAME    WEIGHT  
----------------------  
line-printer    520     
tape-drive      100    
line-printer      520  
tape-drive        100         
byte-soap          75          
card-punch        120

I’ve thought about it for quite some time and am unable to figure it out.

Answer 1

Answering, because it’s not often that I can;

SELECT P1.* 
  from parts P1
  join parts P2 on
       P1.weight > P2.weight
 WHERE P2.name = 'tape drive'