I'm not sure why this isn't working. If I join either table separately, it comes back with the appropriate results, but when I try to join them both, I get 0 results. (car_id and boat_id are both primary keys on their tables.)
$query = "SELECT
*
FROM
posted c
JOIN posted_car e on c.car_id = e.car_id
JOIN posted_boat g on c.boat_id = g.boat_id
WHERE
c.posted = 'posted'
ORDER BY date DESC LIMIT 0, 30";
$resultBoth = mysql_query($query, $db) or die(mysql_error($db));
Might be worth noting that when I do
LEFT JOIN posted_car e on c.car_id = e.car_id
RIGHT JOIN posted_boat g on c.boat_id = g.boat_id
I get results as if I had only joined the posted_boat table. If anyone could point me in the right direction...it would be much appreciated.
you are using JOIN that might be a problem . you should use left outer join to get proper result . check following syntax :
$query = "SELECT *
FROM
posted c
left OUTER JOIN posted_car e on c.car_id = e.car_id
left OUTER JOIN posted_boat g on c.boat_id = g.boat_id
WHERE c.posted = 'posted'
ORDER BY date DESC LIMIT 0, 30";
$resultBoth = mysql_query($query, $db) or die(mysql_error($db));
Related
I have a MySQL query that creates an aggregate of data for an object and all of it's children in a one to many relationship. My query looks like this:
select * from object o
left join event e on o.tenant_id = e.tenant_id AND o.udid = e.udid
left join event_type et on e.event_type_id = et.event_type_id
left join event_custom_field ecf on e.event_id = ecf.event_id
left join profile p on o.tenant_id = p.tenant_id AND o.udid = p.udid
left join status s on o.tenant_id = s.tenant_id AND o.udid = s.udid
left join o_tenant_app ota on o.tenant_id = ota.tenant_id AND o.udid = ota.udid
left join tenant_app ta on ota.tenant_app_id = ta.tenant_app_id
left join heartbeat h on o.tenant_id = h.tenant_id AND o.udid = h.udid
where o.tenant_id = 'a'
AND o.checked_out = false
and p.name in ('test')
and s.status_name in ('stat1', 'stat2')
order by o.udid, e.event_id;
I need to be able to apply a limit to the number of objects returned while still including all of the other joined data. If I put the limit at the end then I will lose object data. I could do this on my first line:
select * from (select * from object limit 0,5) o
but that will show fewer than 5 objects if those first 5 objects don't match the where clause. I would like to do this as performant as possible as I will likely have millions of records to query against.
I have the following SQL:
$queryString = "
SELECT
iR.lastModified,
d.*,
c2.title as stakeholderTitle,
u.username as authorUsername,
c.title as authorContactName,
GROUP_CONCAT(iR.stakeholderRef) AS participants
FROM
informationRelationships iR,
contacts c2
INNER JOIN
debriefs d ON
d.id = iR.linkId
LEFT JOIN
users u ON
u.id = iR.author
LEFT JOIN
contacts c ON
c.ref = u.contactId
LEFT JOIN
debriefs d2 ON
d2.stakeholder = c2.ref
WHERE
(
iR.clientRef = '$clientRef' OR
iR.contactRef = '$contactRef'
)
AND
iR.projectRef = '$projectRef' AND
iR.type = 'Debrief'
GROUP BY
iR.linkId
ORDER BY
d.dateOfEngagement
";
notice how I require 2 different bits of data for the the contacts table.
So at one point, I need to match
c.ref = u.contactId
This will return one bit of information
but I also need a completely different grouping:
d2.stakeholder = c2.ref
Problem is that the title is the column i'm interested in for both:
c2.title as stakeholderTitle,
...
c.title as authorContactName
How do I go about doing this?
My current try is returning:
Error: Unknown column 'iR.linkId' in 'on clause'
I'm not sure I really understand what is happening here:
how to join two tables on common attributes in mysql and php?
EDIT::::---ANSWERED--zerkms
$queryString = "
SELECT
iR.lastModified,
d.*,
c2.title as stakeholderTitle,
u.username as authorUsername,
c.title as authorContactName,
GROUP_CONCAT(iR.stakeholderRef) AS participants
FROM
informationRelationships iR
INNER JOIN
debriefs d ON
d.id = iR.linkId
INNER JOIN
contacts c2 ON
d.stakeholder = c2.ref
LEFT JOIN
users u ON
u.id = iR.author
LEFT JOIN
contacts c ON
c.ref = u.contactId
WHERE
(
iR.clientRef = '$clientRef' OR
iR.contactRef = '$contactRef'
)
AND
iR.projectRef = '$projectRef' AND
iR.type = 'Debrief'
GROUP BY
iR.linkId
ORDER BY
d.dateOfEngagement
";
By re-ordering my query I have managed to get both columns in... Thanks zerkms!
You cannot mix implicit joins and explicit joins in a single query in mysql.
So
FROM informationRelationships iR,
contacts c2
should be rewritten to
FROM informationRelationships iR
INNER JOIN contacts c2 ON ...
Do not use cartesian product and joins in the same query (not subquery), here, use only joins (CROSS JOIN is the same as cartesian product).
There's a query I need to modify. What the query currently does is return search results (ads) based on Ad Title and Ad Description . If any of the search words are either found in ad title or ad description, it returns those results
I want to modify the query so that each ad appears in search results only once for a given ad title... So if there were 5 ads found with the same ad title for the given words in the search , it should return only 1 ad for that ad title...
$sql = "SELECT a.*, UNIX_TIMESTAMP(a.createdon) AS timestamp, ct.cityname,
COUNT(*) AS piccount, p.picfile,
scat.subcatname, cat.catid, cat.catname $xfieldsql
FROM t_ads a
INNER JOIN t_cities ct ON a.cityid = ct.cityid
INNER JOIN t_subcats scat ON a.subcatid = scat.subcatid
INNER JOIN t_cats cat ON scat.catid = cat.catid
LEFT OUTER JOIN t_adxfields axf ON a.adid = axf.adid
LEFT OUTER JOIN t_adpics p ON a.adid = p.adid AND p.isevent = '0'
LEFT OUTER JOIN t_featured feat ON a.adid = feat.adid AND feat.adtype = 'A'
WHERE $where
AND $visibility_condn
AND (feat.adid IS NULL OR feat.featuredtill < NOW())
$loc_condn
GROUP BY a.adid
ORDER BY a.createdon DESC
LIMIT $offset, $ads_per_page";
Edit: $where contains the search expression... if regular expression search is turned on it uses regex otherwise not... $sqlsearch contains the search words that were input by the user...
if ($regex_search) {
$where = "(a.adtitle RLIKE '[[:<:]]{$searchsql}[[:>:]]' OR a.addesc RLIKE '[[:<:]]{$searchsql}[[:>:]]')";
} else {
$where = "(a.adtitle LIKE '$searchsql' OR a.addesc LIKE '$searchsql')";
The "proper" way to do this would be tackle the route cause by working out why the duplicates are appearing in the first place. It will be something to do with the JOINs but without looking at the data I'm unable to answer that. If, however you'd like a quick(ish) and dirty way to remove duplicates, could try something like below.
Disclaimer: This is completely untested so there's more likely to be a mistake or two in here - but hopefully no dealbreaker.
SELECT a2.*, UNIX_TIMESTAMP(a.createdon) AS timestamp, ct2.cityname,
COUNT(*) AS piccount, p2.picfile,
scat2.subcatname, cat2.catid, cat2.catname $xfieldsql
FROM
(SELECT subq1.title, MIN(subq1.adid) AS adid
FROM
(SELECT a.*, UNIX_TIMESTAMP(a.createdon) AS timestamp, ct.cityname,
COUNT(*) AS piccount, p.picfile,
scat.subcatname, cat.catid, cat.catname
FROM t_ads a
INNER JOIN t_cities ct ON a.cityid = ct.cityid
INNER JOIN t_subcats scat ON a.subcatid = scat.subcatid
INNER JOIN t_cats cat ON scat.catid = cat.catid
LEFT OUTER JOIN t_adxfields axf ON a.adid = axf.adid
LEFT OUTER JOIN t_adpics p ON a.adid = p.adid AND p.isevent = '0'
LEFT OUTER JOIN t_featured feat ON a.adid = feat.adid AND feat.adtype = 'A'
WHERE $where
AND $visibility_condn
AND (feat.adid IS NULL OR feat.featuredtill < NOW())
$loc_condn
GROUP BY a.adid) subq1
GROUP BY subq.title) subq2
INNER JOIN t_ads a2 ON a2.adid = subq2.adid
INNER JOIN t_cities ct2 ON a2.cityid = ct2.cityid
INNER JOIN t_subcats scat2 ON a2.subcatid = scat2.subcatid
INNER JOIN t_cats cat2 ON scat2.catid = cat2.catid
LEFT OUTER JOIN t_adxfields axf2 ON a2.adid = axf2.adid
LEFT OUTER JOIN t_adpics p2 ON a2.adid = p2.adid AND p2.isevent = '0'
LEFT OUTER JOIN t_featured feat2 ON a2.adid = feat2.adid AND feat2.adtype = 'A'
ORDER BY a2.createdon DESC
LIMIT $offset, $ads_per_page
This could be massively simplified and tidied up e.g. by removing some of the stuff from the subquery but am just giving the general idea to (hopefully) get you up and running...
Explanation
subq2 simply groups by title and picks out an adid from each group (chose to use MIN here but could have used MAX instead).
subq1 is the original query but with ordering and limits removed since these are applied by the outer query.
The outer query joins back on the de-duped IDs and joins back to the ads and other tables (giving them different aliases) in order to select the fields from your original query.
I have this long query that I finally got to work but I am unable to ORDER BY date_time_added, which is a field that is in all the tables except for user_accounts and relationships table. How do i make it work correctly?
$sql = "select distinct pb.user_id, pb.Full_name,
tv.why_onsite3, tv.onsite3_id, tv.other_date as onsite3_date,
tv.user_allowed as tv_user_allowed, np.onsite4_name ,
np.onsite4_id, np.other_date as onsite4_date, np.user_allowed
as np_user_allowed, pml.med_name , pml.med_id, pml.other_date
as pml_date, pml.user_allowed as pml_user_allowed, pl.onsite5_name,
pl.onsite5_test_id, pl.other_date as some_stats_date, pl.user_allowed as
pl_user_allowed, chlp.problem_name_is , chlp.current_problem_id,
chlp.other_date as chlp_date, chlp.user_allowed as chlp_user_allowed,
pphl.onsite10_health_prob_id , pphl.onsite10_problem_name_is,
pphl.other_date as pphl_date, pphl.user_allowed as pphl_user_allowed,
al.onsite_id , al.onsite_name, al.other_date as onsite_date,
al.user_allowed as al_user_allowed, sl.onsite2_id , sl.onsite2_name,
sl.other_date as onsite2_date, sl.user_allowed as sl_user_allowed,
hal.onsite6_id , hal.reason_for_admit, hal.other_date as hal_date,
hal.user_allowed as hal_user_allowed, il.onsite9_id , il.onsite9_name,
il.other_date as il_date , il.user_allowed as il_user_allowed
from user_accounts pb left join some_stuff tv on pb.user_id = tv.user_id
left join some_onsite4s np on pb.user_id = np.user_id
left join some_med pml on pb.user_id = pml.user_id
left join list_hal hal on pb.user_id = hal.user_id
left join list_for_things il on pb.user_id = il.user_id
left join list_on sl on pb.user_id = sl.user_id
left join some_all al on pb.user_id = al.user_id
left join some_list pphl on pb.user_id = pphl.user_id
left join some_stats pl on pb.user_id = pl.user_id
left join some_probs chlp on pb.user_id = chlp.user_id
where (pb.user_id in (select fb.friend_id from relationships fb
where fb.user_id = '$uid')
or pb.user_id in (select fb1.user_id from relationships fb1
where fb1.friend_id = '$uid')
)
group by pb.user_id ORDER BY date_time_added DESC LIMIT $startrow, 20";
In ORDER BY clause, you have to specify what is the exact column you are ordering by. That means you have to prefix the column that is used for ordering, because you have multiple columns that are called the same in multiple tables.
Other option is to restructure the query completely and use UNION operator with multiple SELECT statements. Each SELECT statement would pickup a group of data from one table and order that group by column from that table.
The solution depend on the data that you want to output - the context of the data.
I have code:
$query = "SELECT a.*, c.name as categoryname, c.id as categoryid
FROM #__table_one as a
LEFT JOIN #__table_two c ON c.id = a.catid";
$query .= " WHERE a.published = 1
AND a.access <= {$aid}
AND a.trash = 0
AND c.published =
AND c.access <= {$aid}
AND c.trash = 0";
I would like to add a third table ('__some_table') for the parts of the query where a.publish, a.access and a.trash. In other words, I want these fields to be retrieved from another table, not "#__table_one", but I do not know how to incorporate the #__some_table into the current query
I imagine the JOIN command can help me, but I do not know how to code mysql
//not tested
$query = "SELECT a.*, c.name as categoryname, c.id as categoryid
FROM #__table_one as a
LEFT JOIN #__table_two c ON c.id = a.catid
LEFT JOIN #__table_three d ON d.id = a.some_id";