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JOIN PERFORMANCE
Posted by: Adam Knight
Date: October 26, 2004 12:10AM

Can anyone tell me if there could be any significant performance difference between using these two queries:

Which should be used for best practice ?

1)
SELECT DISTINCT
suppliers.supplier_name
FROM
raw_sales, suppliers, items left join net_rates
on items.item_id=net_rates.item_id
where
raw_sales.item_num=items.item_num and
items.supplier_id=suppliers.supplier_id and
(net_rates.net_rates_amount = '0' OR net_rates.net_rates_amount IS NULL)

2)
SELECT DISTINCT
suppliers.supplier_name
FROM
suppliers
INNER JOIN
items
ON
suppliers.supplier_id = items.supplier_id
INNER JOIN
raw_sales
ON
raw_sales.item_num = item.item_num
LEFT JOIN
net_rates
ON
items.item_id = net_rates.item_id
ORDER BY supplier_name

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