Hi All,
I'm having a problem with MySQL performing really badly.
if i do a select where we have a join and we are just looking for the search parameter in one of the joined tables, then the query only takes about 1 second:
$res = mysql_query("
SELECT * FROM logs, updates
WHERE logs.feedback_number = updates.feedback_number
AND update_details LIKE '%$like%'
GROUP BY logs.feedback_number
ORDER BY logs.feedback_number DESC
"
similarly, if i look for the search term matching against fileds in the other table, again it only takes about a second
$res = mysql_query("SELECT * FROM logs
WHERE feedback_number LIKE '%$like%'
OR feedback_description LIKE '%$like%'
OR product LIKE '%$like%'
OR product_serial LIKE '%$like%'
OR customer_name LIKE '%$like%'
OR customer_contact LIKE '%$like%'
OR contact_telephone LIKE '%$like%'
OR contact_email LIKE '%$like%'
OR change_request_num LIKE '%$like%'
ORDER BY feedback_number DESC"
but if i try to combine the 2 statements so that in effect it's doing a similar job to both the above combined, it now takes half a minute to return the answers!!??
I was presuming that as both the above took around a second, then the combined search should only take a couple of seconds???
Is it just the case that using too many "LIKE" statements is inefficient??
$res = mysql_query("
SELECT * FROM logs, updates
WHERE logs.feedback_number = updates.feedback_number
AND updates.update_details LIKE '%$like%'
OR logs.feedback_number = '$like'
OR logs.feedback_description LIKE '%$like%'
OR logs.product = '$like'
OR logs.product_serial = '$like'
OR logs.customer_name LIKE '%$like%'
OR logs.customer_contact LIKE '%$like%'
OR logs.contact_telephone = '$like'
OR logs.contact_email = '$like'
OR logs.change_request_num = '$like'
GROUP BY logs.feedback_number
ORDER BY logs.feedback_number DESC
"
please help! :-)