MySQL Query Optimisation - JOIN?

Question

One for all you MySQL experts :-)

I have the following query:

SELECT o.*, p.name, p.amount, p.quantity 
FROM orders o, products p 
WHERE o.id = p.order_i         


        

Answer 1

1. Use Explain to indicate how to optimise the query. I'd suggest starting with indices on Total and TimeStamp

2. You may find removing the date function improves performance.

3. You should use modern syntax.

eg.

SELECT o.*, p.name, p.amount, p.quantity  
FROM orders o
     inner join products p  
     on o.id = p.order_id 
WHERE o.total != '0.00' 
AND o.timestamp BETWEEN '2012-01-01' AND '2012-01-31 23:59'  
ORDER BY o.timestamp ASC