I have one table which has the following data, I want to skip row 3, just want to fetch OPEN status only once, I am using below query but it skipping wor 5 as well.
SELECT t.*
FROM emailEvent t
JOIN
( SELECT MIN(id) AS minid
FROM emailEvent WHERE email_id = 3
GROUP BY status
) AS grp
ON grp.minid = t.id
WHERE (t.email_id = 3)
I came up with this as a solution but not sure if there are any other best solution for this
SELECT t.*
FROM emailEvent t
WHERE t.status != "Open" and t.email_id = 3
UNION
(
SELECT et.*
FROM emailEvent et
WHERE et.status = "Open" and et.email_id = 3
ORDER BY et.createdAt DESC LIMIT 1
)
I want the result to be look like something like this
SELECT *
FROM
(
SELECT t.*,
min(id) over (partition by status) as min_id
FROM emailEvent t
WHERE (t.email_id = 3) -- only email 3
) AS dt
WHERE id = min_id -- only for 'Open' status
OR status <> 'Open'
For older releases not supporting Windowed Aggregates:
select *
from emailEvent
where email_id = 3
and
(
e.status <> 'Open'
or id in (select min(id) -- only for 'Open' status
from emailEvent
where status = 'Open'
and email_id = 3)
)
With NOT EXISTS:
select e.* from emailEvent e
where e.status <> 'Open'
or not exists (select 1 from emailEvent where status = e.status and id < e.id)
Related
I have this working query. It has count with subquery.
SELECT
COUNT(*) AS total
FROM
(SELECT
COUNT(aset)
FROM
`public_1`
WHERE `public_1`.`aset` NOT IN
(SELECT
asset_code
FROM
application_detail
WHERE application_id = 6)
AND org_id = 7
AND status_id = 8
GROUP BY aset) t
now I need to union with different table and get the total from both table. This code could get count record but the value is incorrect.
SELECT
COUNT(*) AS total
FROM
(SELECT
COUNT(aset)
FROM
`public_1`
WHERE `public_1`.`aset` NOT IN
(SELECT
asset_code
FROM
application_detail
WHERE application_id = 6)
AND org_id = 7
AND status_id = 8
UNION
SELECT
COUNT(aset)
FROM
`public_2`
WHERE `public_2`.`aset` NOT IN
(SELECT
asset_code
FROM
application_detail
WHERE application_id = 6)
AND org_id = 7
AND status_id = 8
GROUP BY aset) z
Please assist me in getting the query correct. Thanks in advance
Use SELECT COUNT(DISTINCT aset) to get your counts, and then add them together.
SELECT t1.total + t2.total AS total
FROM (
SELECT COUNT(DISTINCT aset) AS total
FROM `public_1`
WHERE `public_1`.`aset` NOT IN
(SELECT
asset_code
FROM
application_detail
WHERE application_id = 6)
AND org_id = 7
AND status_id = 8) AS t1
CROSS JOIN (
SELECT COUNT(DISTINCT aset) AS total
FROM `public_2`
WHERE `public_2`.`aset` NOT IN
(SELECT
asset_code
FROM
application_detail
WHERE application_id = 6)
AND org_id = 7
AND status_id = 8) AS t2
Basically I need to merge these into one single query:
SELECT COUNT( DISTINCT id ) AS totalRows1
FROM other_events WHERE status = "approved"
AND Location = 1
SELECT COUNT( DISTINCT Id ) AS totalRows2
FROM core_events WHERE Status = "Active"
AND Location_id = 1
When I do it like below, if there is no event with Location_id = 1 query returns 0. In that condition I need it to return the count of the first table only.
SELECT COUNT( DISTINCT t1.id ) + COUNT( DISTINCT t2.Id ) AS total
FROM other_events AS t1, core_events AS t2
WHERE t1.status = "approved"
AND t1.Location = 1
AND t2.Location_id = 1
AND t2.Status = 'Active'
ps. column names are exactly like above
Use a UNION statement to merge the result like this:
SELECT SUM(total) FROM (
SELECT COUNT(DISTINCT id) AS total
FROM other_events
WHERE (status = "approved" AND Location = 1)
UNION ALL
SELECT COUNT(DISTINCT Id) AS total
FROM core_events
WHERE (Location_id = 1 AND Status = 'Active')
) union_result
I have a message table, this table contains the following columns :
id | fromUserId | toUserId | sentDate | readDate | message | subject | fromUserDeleted(bit) | toUserDeleted(bit)
Now I need to select first message within every conversionen no mather if its from or to the current user. What makes it more complex is that I need to exclude messages that are deleted by the current user, so if the message is from current user then the fromUserDeleted have to be 0 if the message is from another user then toUserDeleted needs to be 0.
I know that there already are a lot of examples on how to select first post within groups but this is a bit more complex. The current user might be in toUserId or in fromUserId and the same goes for the deleted column.
This is what I have tried :
SELECT
m1.*,
(SELECT count(*) FROM mail m3 WHERE m3.fromUserId=m1.fromUserId AND m3.toUserId=m1.toUserId AND m3.toUserDeleted = 0) as messageCount,
(SELECT count(*) FROM mail m4 WHERE m4.toUserId=15 AND m4.readDate is null AND m4.toUserDeleted=0) as messagesNotRead
FROM
mail m1
LEFT JOIN mail m2 ON
((m1.fromUserId = m2.fromUserId) and
m2.)
WHERE
m2.id IS NULL AND
(m1.toUserId = 15 OR m1.fromUserId = 15)
ORDER BY
m1.sentDate DESC;
And :
SELECT
*
FROM
mail m1
WHERE
((m1.fromUserId = 15 AND m1.fromUserDeleted=0) OR (m1.toUserId = 15 AND m1.toUserDeleted=0)) AND
m1.id = (SELECT m2.id FROM mail m2 WHERE m2.fromUserId = 15 OR m2.toUserId = 15 OR m2.fromUserId = m1.fromUserId OR m2.fromUserId = m1.toUserId OR m2.toUserId = m1.fromUserId OR m2.toUserId = m1.toUserId order By m2.sentDate desc limit 0,1)
Order by m1.sentDate DESC
None of these will do what I need. Pleas help!
It´s okay if a stored procedure needs to be created.
IMPORTANT : This i MySQL
EDIT 1:
Pleas see this for example : http://sqlfiddle.com/#!2/6a2ef/3
DOING UNPIVOT to get fromUSerId, toUserId under same column so that we can pick correct userId based on the sentDate.
SELECT T.*
FROM
(
SELECT *,
ROW_NUMBER() OVER ( PARTITION BY userVal ORDER BY sentDate DESC) as seq
FROM
(SELECT
*
FROM msg
WHERE (fromUserId = #userID AND fromUserDeleted = 0 )
OR (toUserId = #UserID AND toUserDeleted = 0)
)p
unpivot
( userVal for UserId in ( fromUserId, toUserId)
)as unpvt
) T
WHERE seq =1
Thanks for the feedback. Hopefully this will address your need:
DECLARE #UserID INT
SELECT #UserID = 15
SELECT *
FROM (
SELECT UserID, ConversationWithUserID, sentDate, readDate, [message], [subject], ROW_NUMBER() OVER (PARTITION BY ConversationWithUserID ORDER BY sentDate ASC) AS MessageOrder
FROM (
SELECT id, fromUserId AS UserID, toUserId AS ConversationWithUserID, sentDate, readDate, [message], [subject]
FROM dbo.mail
WHERE fromUserID = #UserID AND fromUserDeleted = 0
UNION
SELECT id, toUserId AS UserID, fromUserId AS ConversationWithUserID, sentDate, readDate, [message], [subject]
FROM dbo.mail
WHERE toUserId = #UserID AND toUserDeleted = 0
) x
) y
WHERE MessageOrder = 1
ORDER BY y.UserID, y.ConversationWithUserID
I have 100 records from 3 users. I want to show the most recent record from each user. I have the following query:
SELECT *
FROM Mytable
WHERE Dateabc = CURRENT DATE
AND timeabc =
(
SELECT MAX(timeabc)
FROM Mytable
)
It returns the most recent record for everyone, and I need it to return most recent record from every user.
Should the solution support both DB2 and mysql?
SELECT * FROM Mytable as x
WHERE Dateabc = CURRENT_DATE
AND timeabc = (SELECT MAX( timeabc ) FROM Mytable as y where x.user = y.user)
If it's only DB2 more efficient solutions exists:
SELECT * from (
SELECT x.*, row_number() over (partition by user order by timeabc desc) as rn
FROM Mytable as x
)
WHERE rn = 1
I assume somewhere in your table you have a userID...
select userID, max(timeabc) from mytable group by userID
SELECT *
FROM Mytable as a
WHERE Dateabc = CURRENT_DATE
AND timeabc =
(
SELECT MAX( timeabc )
FROM Mytable as b
WHERE a.uId = b.uId
)
I have table psc_Pro_ProfessorPositions(ProfessorID,PositionID,StartDate,EndDate). It have 2 primary key is ProfessorID,PositionID.
I want to check ProfessorID,PositionID not in table to insert.I wrote like this:
insert into CoreUIs.dbo.psc_Pro_ProfessorPositions
(
ProfessorID,PositionID,StartDate,EndDate
)
select a.MaQuanLy,b.MaQuanLy,convert(smalldatetime,NgayHieuLuc),convert(smalldatetime,NgayHetHieuLuc)
from inserted
inner join GiangVien a on a.MaGiangVien = inserted.MaGiangVien
inner join ChucVu b on b.MaChucVu = inserted.MaChucVu
where a.MaQuanLy not in (select ProfessorID from CoreUIs.dbo.psc_Pro_ProfessorPositions)
and b.MaQuanLy not in (select PositionID from CoreUIs.dbo.psc_Pro_ProfessorPositions)
But it's wrong.Can help me?Thanks all.
;WITH x AS
(
SELECT TeacherID, ClassID, ClassStuID, s = [SUM],
rn = ROW_NUMBER() OVER (PARTITION BY TeacherID ORDER BY ClassID)
FROM dbo.TB1
)
SELECT TeacherID, ClassID, ClassStuID,
[SUM] = CASE rn WHEN 1 THEN s ELSE NULL END
FROM x
ORDER BY TeacherID, [SUM] DESC;
You can employ CTEs with ROW_NUMBER()OVER() to identify the first row of each TeacherID:
; with a as (
select * from TB1
union
select * from TB2
)
, b as (
select *, r=ROW_NUMBER()over(partition by a.TeacherID order by a.TeacherID,
a.ClassID, a.ClassStuID) from a
)
select b.TeacherID, b.ClassID, b.ClassStuID
, [SUM]=case b.r when 1 then b.[SUM] else null end
from b
order by b.TeacherID, b.r
go
Result: