$query_index_neighborhood1 =
"SELECT areas_db.areas_name, areas_db.areas_id, neighborhoods_db.neighborhoods_id,
neighborhoods_db.neighborhoods_name, neighborhoods_db.neighborhoods_area_id,
areas_db.areas_state_id
FROM (
(
(
restaurants_db
INNER JOIN neighborhoods_db ON neighborhoods_db.neighborhoods_id=restaurants_db.restaurants_neighborhood
)
INNER JOIN areas_db ON areas_db.areas_id=neighborhoods_db.neighborhoods_area_id
)
INNER JOIN areas_db AS areas_db1 on areas_db1.areas_id=restaurants_db.restaurants_area
)
WHERE areas_db.areas_state_id=$mxstateid
GROUP BY neighborhoods_db.neighborhoods_id
ORDER BY areas_db.areas_id, neighborhoods_db.neighborhoods_name ASC";
As an interesting thought exercise, I came up with the following:
SELECT a.areas_name,
a.areas_id,
n.neighborhoods_id,
n.neighborhoods_name,
n.neighborhoods_area_id,
a.areas_state_id
FROM neighborhoods_db AS n
INNER JOIN areas_db AS a ON a.areas_id = n.neighborhoods_area_id
WHERE a.areas_state_id = $mxstateid
AND n.neighborhoods_id in (SELECT restaurants_neighborhood FROM restaurants_db)
ORDER BY a.areas_id, n.neighborhoods_name ASC
Also, table aliases are your friend.
Related
I'm not sure how to make the following SQL query more efficient. Right now, the query is taking 8 - 12 seconds on a pretty fast server, but that's not close to fast enough for a Website when users are trying to load a page with this code on it. It's looking through tables with many rows, for instance the "Post" table has 717,873 rows. Basically, the query lists all Posts related to what the user is following (newest to oldest).
Is there a way to make it faster by only getting the last 20 results total based on PostTimeOrder?
Any help would be much appreciated or insight on anything that can be done to improve this situation. Thank you.
Here's the full SQL query (lots of nesting):
SELECT DISTINCT p.Id, UNIX_TIMESTAMP(p.PostCreationTime) AS PostCreationTime, p.Content AS Content, p.Bu AS Bu, p.Se AS Se, UNIX_TIMESTAMP(p.PostCreationTime) AS PostTimeOrder
FROM Post p
WHERE (p.Id IN (SELECT pc.PostId
FROM PostCreator pc
WHERE (pc.UserId IN (SELECT uf.FollowedId
FROM UserFollowing uf
WHERE uf.FollowingId = '100')
OR pc.UserId = '100')
))
OR (p.Id IN (SELECT pum.PostId
FROM PostUserMentions pum
WHERE (pum.UserId IN (SELECT uf.FollowedId
FROM UserFollowing uf
WHERE uf.FollowingId = '100')
OR pum.UserId = '100')
))
OR (p.Id IN (SELECT ssp.PostId
FROM SStreamPost ssp
WHERE (ssp.SStreamId IN (SELECT ssf.SStreamId
FROM SStreamFollowing ssf
WHERE ssf.UserId = '100'))
))
OR (p.Id IN (SELECT psm.PostId
FROM PostSMentions psm
WHERE (psm.StockId IN (SELECT sf.StockId
FROM StockFollowing sf
WHERE sf.UserId = '100' ))
))
UNION ALL
SELECT DISTINCT p.Id AS Id, UNIX_TIMESTAMP(p.PostCreationTime) AS PostCreationTime, p.Content AS Content, p.Bu AS Bu, p.Se AS Se, UNIX_TIMESTAMP(upe.PostEchoTime) AS PostTimeOrder
FROM Post p
INNER JOIN UserPostE upe
on p.Id = upe.PostId
INNER JOIN UserFollowing uf
on (upe.UserId = uf.FollowedId AND (uf.FollowingId = '100' OR upe.UserId = '100'))
ORDER BY PostTimeOrder DESC;
Changing your p.ID in (...) predicates to existence predicates with correlated subqueries may help. Also since both halves of your union all query are pulling from the Post table and possibly returning nearly identical records you might be able to combine the two into one query by left outer joining to UserPostE and adding upe.PostID is not null as an OR condition in the WHERE clause. UserFollowing will still inner join to UPE. If you want the same Post record twice once with upe.PostEchoTime and once with p.PostCreationTime as the PostTimeOrder you'll need keep the UNION ALL
SELECT
DISTINCT -- <<=- May not be needed
p.Id
, UNIX_TIMESTAMP(p.PostCreationTime) AS PostCreationTime
, p.Content AS Content
, p.Bu AS Bu
, p.Se AS Se
, UNIX_TIMESTAMP(coalesce( upe.PostEchoTime
, p.PostCreationTime)) AS PostTimeOrder
FROM Post p
LEFT JOIN UserPostE upe
INNER JOIN UserFollowing uf
on (upe.UserId = uf.FollowedId AND
(uf.FollowingId = '100' OR
upe.UserId = '100'))
on p.Id = upe.PostId
WHERE upe.PostID is not null
or exists (SELECT 1
FROM PostCreator pc
WHERE pc.PostId = p.ID
and pc.UserId = '100'
or exists (SELECT 1
FROM UserFollowing uf
WHERE uf.FollowedId = pc.UserID
and uf.FollowingId = '100')
)
OR exists (SELECT 1
FROM PostUserMentions pum
WHERE pum.PostId = p.ID
and pum.UserId = '100'
or exists (SELECT 1
FROM UserFollowing uf
WHERE uf.FollowedId = pum.UserId
and uf.FollowingId = '100')
)
OR exists (SELECT 1
FROM SStreamPost ssp
WHERE ssp.PostId = p.ID
and exists (SELECT 1
FROM SStreamFollowing ssf
WHERE ssf.SStreamId = ssp.SStreamId
and ssf.UserId = '100')
)
OR exists (SELECT 1
FROM PostSMentions psm
WHERE psm.PostId = p.ID
and exists (SELECT
FROM StockFollowing sf
WHERE sf.StockId = psm.StockId
and sf.UserId = '100' )
)
ORDER BY PostTimeOrder DESC
The from section could alternatively be rewritten to also use an existence clause with a correlated sub query:
FROM Post p
LEFT JOIN UserPostE upe
on p.Id = upe.PostId
and ( upe.UserId = '100'
or exists (select 1
from UserFollowing uf
where uf.FollwedID = upe.UserID
and uf.FollowingId = '100'))
Turn IN ( SELECT ... ) into a JOIN .. ON ... (see below)
Turn OR into UNION (see below)
Some the tables are many:many mappings? Such as SStreamFollowing? Follow the tips in http://mysql.rjweb.org/doc.php/index_cookbook_mysql#many_to_many_mapping_table
Example of IN:
SELECT ssp.PostId
FROM SStreamPost ssp
WHERE (ssp.SStreamId IN (
SELECT ssf.SStreamId
FROM SStreamFollowing ssf
WHERE ssf.UserId = '100' ))
-->
SELECT ssp.PostId
FROM SStreamPost ssp
JOIN SStreamFollowing ssf ON ssp.SStreamId = ssf.SStreamId
WHERE ssf.UserId = '100'
The big WHERE with all the INs becomes something like
JOIN ( ( SELECT pc.PostId AS id ... )
UNION ( SELECT pum.PostId ... )
UNION ( SELECT ssp.PostId ... )
UNION ( SELECT psm.PostId ... ) )
Get what you can done of that those suggestions, then come back for more advice if you still need it. And bring SHOW CREATE TABLE with you.
I have below query , only 800 record taking 5 minits to run, can you some help please
SELECT
vtiger_salesorder.salesorderid,vtiger_salesorder.salesorder_no,vtiger_salesorder.sostatus,
(SELECT se.s_date
FROM
softMax_events as se
INNER JOIN vtiger_salesorder as bm ON bm.salesorderid = se.orderNum
where (bm.sostatus = 'Order' AND se.orderNum = vtiger_salesorder.salesorderid) AND se.appointTyp='60'
group by bm.salesorderid Limit 0,1) As sdate
FROM
vtiger_salesorder
Inner Join vtiger_crmentity ON vtiger_salesorder.salesorderid = vtiger_crmentity.crmid
WHERE (vtiger_salesorder.sostatus = 'Order')
and ( vtiger_crmentity.deleted<>'1')
Try this query, hope so this will help you,
SELECT vtiger_salesorder.salesorderid,vtiger_salesorder.salesorder_no,vtiger_salesorder.sostatus,se.s_date
FROM vtiger_salesorder
Inner Join vtiger_crmentity ON vtiger_salesorder.salesorderid = vtiger_crmentity.crmid
INNER JOIN softMax_events se ON se.orderNum = salesorderid
WHERE (vtiger_salesorder.sostatus = 'Order') AND/OR
se.orderNum = vtiger_salesorder.salesorderid AND se.appointTyp='60'
and ( vtiger_crmentity.deleted<>'1')
Edit:
I noticed that there is some relation between vtiger_salesorder and softMax_events and you can use a join for both table, and in this way you can remove that inner query, i tried it you may test it. this will help you for sure after a bit modification.
I have two tables
one is
Receivesms(Matchdate,Matchtime,Keyword,SmsMessage,Mobileno)
another is
QAoptios(Keyword,Question,Answeroption,Matchdate,Matchtime)
I need to find the count of SmsMessage which have the value same as Answeroption on same Matchdate,Matchtime and same Keyword. and also i need to filter on Receivesms.Matchdate='2012-12-25 00:00:00.000'
SELECT
q.AnswerOption,
COUNT(SmsMessage) TheCount
FROM Receivesms r
INNER JOIN QAoptions q ON r.Matchdate = q.Matchdate
AND r.Matchtime = q.Matchtime
AND r.Keyword = q.keyword
GROUP BY q.AnswerOption;
use can use:
select count(*) from Recievesms r,QAoptios q
where
r.Matchdate = q.Matchdate
and
r.Matchtime = q.Matchtime
and
r. Keyword =q.Keyword
and
r.SmsMessage = q.Answeroption;
or
select count(*) from from Recievesms as r
inner join
QAoptios as q
on
r.SmsMessage = q.Answeroption;
try this one
SELECT count(*) from Receivesms as a inner join QAoptios as b on a.keyword=b.keyword
and a.matchtime=b.matchtime and a.matchdate=b.matchdate and a.value=b.answeroption
SELECT COUNT(R.SmsMessage)
FROM Receivesms R
INNER JOIN QAoptios Q ON
R.Keyword=Q.Keyword AND
R.Matchdate=Q.Matchdate AND
R.Matchtime=Q.Matchtime AND
R.SmsMessage=Q.AnswerOption
Or you can add GROUP BY clause if you want to show AnswerQuestion, like this:
SELECT Q.AnswerOption, COUNT(R.SmsMessage) as TheCount
FROM Receivesms R
INNER JOIN QAoptios Q ON
R.Keyword=Q.Keyword AND
R.Matchdate=Q.Matchdate AND
R.Matchtime=Q.Matchtime AND
R.SmsMessage=Q.AnswerOption
GROUP BY Q.AnswerOption
i have this query:
SELECT `completed`.`ID` AS `ID`,`completed`.`level` AS `level`,`completed`.`completed_in` AS `completed_in`, COUNT(1) AS `right_answers_num`
FROM `completed`
INNER JOIN `history` ON `history`.`ID` = `completed`.`ID`
INNER JOIN `questions` ON `questions`.`ID` = `history`.`question`
WHERE `completed`.`student_id` = '1' AND `questions`.`answer` = `history`.`answer`
GROUP BY `completed`.`ID`
ORDER BY `completed`.`completed_in` DESC
what i need is to get info of each test in completed table (id,level,completed_in,right_answer_num)
the problem with that query is that if there is no one right answer(history.answer = questions.answer) then it doesn't return the row, while it should return the row(id,level,completed_in) and the right_answer_num(counter) should be zero..
please help me,, thanks ahead.
SELECT
completed.ID AS ID,
completed.level AS level,
completed.completed_in AS completed_in,
COUNT(questions.answer) AS right_answers_num
FROM completed
INNER JOIN history ON history.ID = completed.ID
LEFT JOIN questions ON questions.ID = history.question AND questions.answer = history.answer
WHERE
completed.student_id = '1'
GROUP BY
completed.ID
ORDER BY completed.completed_in DESC
use a LEFT OUTER JOIN intead of an INNER JOIN.
The second inner join is what's causing rows with no record in the questions table to be omitted. An inner join will only return rows that have data in all corresponding tables. Change the second inner join to a left join like so:
SELECT
completed.ID AS ID,
completed.level AS level,
completed.completed_in AS completed_in,
COUNT(questions.answer) AS right_answers_num
FROM completed
INNER JOIN history ON history.ID = completed.ID
LEFT JOIN questions ON questions.ID = history.question
WHERE completed.student_id = 1
GROUP BY completed.ID
ORDER BY completed.completed_in DESC
I would like to use JOIN instead of IN in the following SQL query. I can't figure out how to do it.
SELECT * FROM shop_orders WHERE
id IN (SELECT orders_id FROM shop_orders_data WHERE closed='1' /*AND backorder='0'*/ AND exhibition_id='389' AND
exhibition_id IN (SELECT id FROM shop_exhibitions WHERE
country_id IN (SELECT id FROM countries WHERE id='72')) AND in_country = '72' AND
exhibition_id IN (SELECT id FROM shop_exhibitions WHERE start<=1336946400 AND end>1336600800)) AND
id IN (SELECT orders_id FROM shop_orders_products WHERE
products_id IN (SELECT id FROM shop_products WHERE artno='120000' OR name LIKE '%120000%')) AND created>=1333231200 AND created<1333663200 ORDER BY created DESC
I tried this:
SELECT
s.*
FROM
shop_orders s
INNER JOIN shop_orders_data od ON s.id=od.orders_id
INNER JOIN shop_exhibitions se ON od.exhibition_id=se.id
INNER JOIN countries co ON se.country_id=co.id
INNER JOIN shop_orders_products sop ON s.id=sop.orders_id
INNER JOIN shop_products sp
ON sop.products_id=sp.id
WHERE od.closed=1
AND ( sp.artno='120000' or sp.name LIKE '%120000%' )
AND ( od.exhibition_id='389')
AND ( od.in_country = '72')
AND ( se.start <=1336946400)
AND ( se.end >1336600800)
AND ( se.created>=1333231200)
AND ( se.created<1333663200)
ORDER BY `s`.`created` DESC
I this correct??
See if this works (and study the code to learn how it works):
SELECT *
FROM shop_orders so
JOIN shop_orders_data sod ON (
(so.id = sod.orders_id)
AND (sod.closed = '1')
/*AND (sod.backorder = '0') */
AND (sod.exhibition_id = '389')
AND (sod.in_country = '72')
)
JOIN shop_exhibitions se ON (
(sod.exhibition_id = se.id)
AND (se.start <= 1336946400)
AND (se.end > 1336600800)
)
JOIN countries c ON (
(se.country_id = c.id)
AND (c.id = '72')
)
JOIN shop_orders_products sop ON (
(so.id = sop.orders_id)
)
JOIN shop_products sp ON (
(sop.products_id = sp.id)
AND ((sp.artno='120000') OR (sp.name LIKE '%120000%'))
)
WHERE (so.created >= 1333231200) AND (so.created < 1333663200)
ORDER BY so.created DESC;
The join syntax works like this:
SELECT field1,field2,field3
FROM FirstTable
JOIN SecondTable ON (FirstTable.PrimaryKey = SecondTable.ForeignKey)
JOIN ThirdTable ON (FirstTable.PrimaryKey = ThirdTable.ForeignKey)
Try applying this approach to your query.