Golang GORP - No error, no results - mysql

dbCount, er2 = dbmap.SelectInt("SELECT COUNT(*) AS N FROM (SELECT av.id FROM Table av LEFT JOIN Table2 dt ON dt.`app_id` = av.`app_id` LEFT JOIN Table3 a ON a.`id` = av.`app_id` WHERE dt.`user_id` IN (?) OR a.`org_id` IN (?) GROUP BY av.id LIMIT ? OFFSET ?) tmp", user_id, org_ids, limit, offset)
user_id = 1000
org_ids = 13444,12444,10333
limit = 25
offset = 0
Any idea why this returns no error or results in GO but when run directly on the database returns 1 result? There are no errors either.

Related

Query is running too slow?

I am writing a MySQL query with left join it giving me result in 28 seconds when I remove and condition with left join then it working in one second can any one tell me what is the issue in my query and how it will be modified?
select *
FROM regist_queue rq
left join appoint ap
on rq.token_number = ap.daily_ticket_no
and rq.LocationId = 15800
and ap.LocationId = 15800
and date(rq.QueueDate) = CURRENT_DATE()
and date(ap.dAppDate) = date(now())
left join patient pr
on ap.iPatID = pr.IPatID
left join gender ge
on pr.vGender = ge.iGenderID
where ifnull(ap.isDel,0) = 0
and ifnull(ap.is_referred,0) != 1
and (ap.LocationId = 15800 or rq.LocationId = 15800 )
order by rq.token_number asc;
I also applied indexes on all searched parameters and where joins are applied.
Explain plan of query.
MySQL Query Plan:
Your purpose is not pretty clear to me. For an example in the join and rq.LocationId = 15800
and ap.LocationId = 15800
and in the where clause and (ap.LocationId = 15800 or rq.LocationId = 15800 )
what my suggestion is to have something like this.
in the left join rq.LocationId = ap.LocationId
and in the where clause ap.LocationId = 15800
it is hard to evaluate the performance without having the real data.
Use SQL with (nolock) in sql query
like :
select *
FROM regist_queue rq with (nolock)
left join appoint ap with (nolock)
on rq.token_number = ap.daily_ticket_no
and rq.LocationId = 15800
and ap.LocationId = 15800
and date(rq.QueueDate) = CURRENT_DATE()
and date(ap.dAppDate) = date(now())
left join patient pr with (nolock)
on ap.iPatID = pr.IPatID
left join gender ge with (nolock)
on pr.vGender = ge.iGenderID
where ifnull(ap.isDel,0) = 0
and ifnull(ap.is_referred,0) != 1
and (ap.LocationId = 15800 or rq.LocationId = 15800 )
order by rq.token_number asc;
it seems there is Cartesian join....
base on the three predicate starts with on .........,
i think the sql statement does not based on your real purpose...

Results returning twice from MySQL query

I'm struggling to figure out why my results are returning twice for the group messages. It's returning the correct values for the single conversations.
It should be returning all the data from Data in table screenshot. However it's returning the data with is_group = 1 twice.
Data in Table:
MySQL Query:
(SELECT dm.* FROM `direct_message`AS dm
INNER JOIN direct_message_thread AS dmt
ON dmt.chat_id = dm.id
WHERE
( dm.recipient_id = '10896' OR dm.creator_id = '10896' )
AND dm.school_id = '1'
GROUP BY dm.id
ORDER BY dmt.inserted DESC
) UNION ALL (
SELECT dm.* FROM `direct_message` AS dm
INNER JOIN direct_message_thread AS dmt ON dmt.chat_id = dm.id
LEFT JOIN direct_message_group AS dmg ON dmg.chat_id = dm.id
WHERE dmg.staff_id = '10896' AND dm.school_id = '1'
GROUP BY dm.id
ORDER BY dmt.inserted DESC
) LIMIT 0, 25
Results:
I think it could be because of the first SELECT getting the results and then the UNION ALL get the same results but not grouping together with the first SELECT
When I try and do the following:
(SELECT dm.* FROM `direct_message`AS dm
INNER JOIN direct_message_thread AS dmt
ON dmt.chat_id = dm.id
WHERE ( dm.recipient_id = '10896' OR dm.creator_id = '10896' )
AND dm.school_id = '1'
) UNION ALL (
SELECT dm.* FROM `direct_message` AS dm
INNER JOIN direct_message_thread AS dmt ON dmt.chat_id = dm.id
LEFT JOIN direct_message_group AS dmg ON dmg.chat_id = dm.id
WHERE dmg.staff_id = '10896' AND dm.school_id = '1'
)
GROUP BY dm.id
ORDER BY dmt.inserted DESC
LIMIT 0, 25
It shows this error message:
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use
near 'GROUP BY dm.id ORDER BY dmt.inserted DESC LIMIT 0, 25' at line
14
You are using union for two queries.
Records 595-597 and 599-601 are met both of them.
My be better to select to whole query with
select id,...
from (...)
group by id

Join between sub-queries in SQLAlchemy

In relation to the answer I accepted for this post, SQL Group By and Limit issue, I need to figure out how to create that query using SQLAlchemy. For reference, the query I need to run is:
SELECT t.id, t.creation_time, c.id, c.creation_time
FROM (SELECT id, creation_time
FROM thread
ORDER BY creation_time DESC
LIMIT 5
) t
LEFT OUTER JOIN comment c ON c.thread_id = t.id
WHERE 3 >= (SELECT COUNT(1)
FROM comment c2
WHERE c.thread_id = c2.thread_id
AND c.creation_time <= c2.creation_time
)
I have the first half of the query, but I am struggling with the syntax for the WHERE clause and how to combine it with the JOIN. Any one have any suggestions?
Thanks!
EDIT: First attempt seems to mess up around the .filter() call:
c = aliased(Comment)
c2 = aliased(Comment)
subq = db.session.query(Thread.id).filter_by(topic_id=122098).order_by(Thread.creation_time.desc()).limit(2).offset(2).subquery('t')
subq2 = db.session.query(func.count(1).label("count")).filter(c.id==c2.id).subquery('z')
q = db.session.query(subq.c.id, c.id).outerjoin(c, c.thread_id==subq.c.id).filter(3 >= subq2.c.count)
this generates the following SQL:
SELECT t.id AS t_id, comment_1.id AS comment_1_id
FROM (SELECT count(1) AS count
FROM comment AS comment_1, comment AS comment_2
WHERE comment_1.id = comment_2.id) AS z, (SELECT thread.id AS id
FROM thread
WHERE thread.topic_id = :topic_id ORDER BY thread.creation_time DESC
LIMIT 2 OFFSET 2) AS t LEFT OUTER JOIN comment AS comment_1 ON comment_1.thread_id = t.id
WHERE z.count <= 3
Notice the sub-query ordering is incorrect, and subq2 somehow is selecting from comment twice. Manually fixing that gives the right results, I am just unsure of how to get SQLAlchemy to get it right.
Try this:
c = db.aliased(Comment, name='c')
c2 = db.aliased(Comment, name='c2')
sq = (db.session
.query(Thread.id, Thread.creation_time)
.order_by(Thread.creation_time.desc())
.limit(5)
).subquery(name='t')
sq2 = (
db.session.query(db.func.count(1))
.select_from(c2)
.filter(c.thread_id == c2.thread_id)
.filter(c.creation_time <= c2.creation_time)
.correlate(c)
.as_scalar()
)
q = (db.session
.query(
sq.c.id, sq.c.creation_time,
c.id, c.creation_time,
)
.outerjoin(c, c.thread_id == sq.c.id)
.filter(3 >= sq2)
)

Difficult MySQL Statement

I've got this query but the result is wrong.
How can I use the min() statement and the Group by Statement so that I will get for each AthletenID the lowest DiszOrder?
Select
ar_Leistungen.`AthletenID`,
ar_Leistungen.`Leistung`,
ar_Leistungen.`Disziplin`,
ar_Leistungen.`Klasse`,
min(ar_Leistungen.`DiszOrder`),
ar_Athleten.`Vorname`,
ar_Athleten.`Jahrgang`,
ar_Wettkampf.`Wettkampfdatum`
from
ar_Leistungen,
ar_Athleten,
ar_Wettkampf
Where
ar_Athleten.ID = ar_Leistungen.AthletenID and
ar_Leistungen.WettkampfID = ar_Wettkampf.ID and
ar_Leistungen.`Disziplin` = '100' and
ar_Leistungen.`Leistung` > 0 and
(ar_Athleten.`Jahrgang` = '1995' or ar_Athleten.`Jahrgang` = '1994') and
ar_Wettkampf.`Wettkampfdatum` LIKE '%2013%'
Group By
AthletenID
Order by
DiszOrder Desc
Limit
0, 100
You can have a subquery which separately gets the lowest DiszOrder for each AthletenID and join it with the other table so you can freely get the other value of the columns.
SELECT a.AthletenID,
a.Leistung,
a.Disziplin,
ar_Leistungen.Klasse,
a.DiszOrder),
b.Vorname,
b.Jahrgang,
c.Wettkampfdatum
FROM ar_Leistungen a
INNER JOIN ar_Athleten b
ON b.ID = a.AthletenID
INNER JOIN ar_Wettkampf c
ON a.WettkampfID = c.ID
INNER JOIN
(
SELECT AthletenID, MIN(DiszOrder) DiszOrder
FROM ar_Leistungen
GROUP BY AthletenID
) d ON a.AthletenID = d.AthletenID AND
a.DiszOrder = d.DiszOrder
WHERE a.Disziplin = '100' AND
a.Leistung > 0 AND
(b.Jahrgang IN ('1995', '1994'))

Strange: MySQL Left Join, "unknown column"; the same leftjoin doesn't work in multiple-table query

I'm trying to run a select query, which is the following:
SELECT * FROM pages, c_item_category cc
LEFT JOIN pages_tr ON (pages.page_id = pages_tr.page_id AND lang_id = 2)
LEFT JOIN users ON (pages.page_author = users.u_id)
WHERE (pages.page_id = cc.item_id AND cc.cat_id = 7)
AND (page_date >= 1317420000 AND page_date <= 1320101999)
AND (page_showinfos = 1)
ORDER BY page_date ASC LIMIT 0,10
But I get this error: Unknown column 'pages.page_id' in 'on clause'
Why is that? I can confirm that I have a column named 'page_id' in 'pages' :)
But, when I do a single-table query with the same left joins, it works well:
SELECT * FROM pages
LEFT JOIN pages_tr ON (pages.page_id = pages_tr.page_id AND lang_id = 2)
LEFT JOIN users ON (pages.page_author = users.u_id)
WHERE (page_date >= 1317420000 AND page_date <= 1320101999)
AND (page_showinfos = 1)
ORDER BY page_date ASC LIMIT 0,10
What is my mistake in the first query? :\
Try it this way instead.
SELECT *
FROM pages
LEFT JOIN pages_tr ON (pages.page_id = pages_tr.page_id AND lang_id = 2)
LEFT JOIN users ON (pages.page_author = users.u_id),
c_item_category cc
WHERE (pages.page_id = cc.item_id AND cc.cat_id = 7)
AND (page_date >= 1317420000 AND page_date <= 1320101999)
AND (page_showinfos = 1)
ORDER BY page_date ASC LIMIT 0,10