I have this query:
SELECT
[Address]=e.Address,
[LastEmail] =
(
SELECT TOP 1 [Email]
FROM Email innerE
WHERE e.UserID = innerE.UserID
AND innerE.Contact = #emailId
AND (IsSent is null OR isSent = 0)
ORDER BY Timestamp DESC
)
FROM Emails e
This works fine, but now, I realized i'd like to get the entire row containing that lastemail column, if this is possible, any ideas on how it could be done?
You can do this:
;WITH LastEmails
AS
(
SELECT *,
ROW_NUMBER() OVER(ORDER BY Timestamp DESC) rownum
FROM Emails
WHERE Contact = #emailId
AND (IsSent is null OR isSent = 0)
)
SELECT * FROM LastEmails
WHERE rownum = 1;
If your DBMS supports it you can use APPLY (which I think it does as it looks like SQL-Server Syntax)
SELECT [Address]=e.Address,
[LastEmail] = ie.Email
FROM Emails e
OUTER APPLY
( SELECT TOP 1 *
FROM Email innerE
WHERE e.UserID = innerE.UserID
AND innerE.Contact = #emailId
AND (IsSent is null OR isSent = 0)
ORDER BY Timestamp DESC
) ie
This works similar a correlated subquery but allows mulitple rows and multiple columns.
Related
I have the following query where I unique records for patient_id, meaning patient_id should not be duplicate. Each time I try executing the query, seems like the DB hangs or it takes hours to execute, I'm not sure. I need my records to load quickly. Any quick resolution will be highly appreciated.
SELECT DISTINCT a.patient_id,
a.study_id,
a.procstep_id,
a.formdata_seq,
0,
(SELECT MAX(audit_id)
FROM audit_info
WHERE patient_id =a.patient_id
AND study_id = a.study_id
AND procstep_id = a.procstep_id
AND formdata_seq = a.formdata_seq
) AS data_session_id
FROM frm_rg_ps_rg a,
PATIENT_STUDY_STEP pss
WHERE ((SELECT COUNT(*)
FROM frm_rg_ps_rg b
WHERE a.patient_id = b.patient_id
AND a.formdata_seq = b.formdata_seq
AND a.psdate IS NOT NULL
AND b.psdate IS NOT NULL
AND a.psresult IS NOT NULL
AND b.psresult IS NOT NULL) = 1)
OR NOT EXISTS
(SELECT *
FROM frm_rg_ps_rg c
WHERE a.psdate IS NOT NULL
AND c.psdate IS NOT NULL
AND a.psresult IS NOT NULL
AND c.psresult IS NOT NULL
AND a.patient_id = c.patient_id
AND a.formdata_seq = c.formdata_seq
AND a.elemdata_seq! =c.elemdata_seq
AND a.psresult != c.psresult
AND ((SELECT (a.psdate - c.psdate) FROM dual)>=7
OR (SELECT (a.psdate - c.psdate) FROM dual) <=-7)
)
AND a.psresult IS NOT NULL
AND a.psdate IS NOT NULL;
For start, you have a cartesian product with PATIENT_STUDY_STEP (pss).
It is not connected to anything.
select *
from (select t.*
,count (*) over (partition by patient_id) as cnt
from frm_rg_ps_rg t
) t
where cnt = 1
;
I'm creating a view in MariaDB and i'm having trouble making it work for a couple of fields. Currently this is working:
( SELECT DISTINCT IFNULL(grades.`grade`,'No Grade')
FROM `table` grades
WHERE userinfo.`id` = grades.`id`
AND grades.`Item Name` = 'SOMEINFO'
) 'SOMENAME',
But i need to add a select where the 'No grade' is, in the following form
( SELECT DISTINCT IFNULL( grades.`grade`,
SELECT IF( EXISTS
( SELECT *
FROM `another_table`
WHERE userid = 365
AND courseid = 2
), 'Enrolled', 'Not enrolled'
)
)
FROM `table` grades
WHERE userinfo.`id` = grades.`id`
AND grades.`Item Name` = 'SOMEINFO'
) 'SOMENAME',
i know that
SELECT IF( EXISTS( SELECT *
FROM `another_table`
WHERE userid = 365
AND courseid = 2
),
'Enrolled', 'Not enrolled'
)
is working too, but now the whole thing it's giving me an error, so any suggestions would be greatly appreciated
Thanks
This looks like a subquery:
(SELECT DISTINCT IFNULL(grades.`grade`,
SELECT IF( EXISTS (SELECT *
FROM `another_table`
WHERE userid = 365 AND courseid = 2
), 'Enrolled', 'Not enrolled'
)
)
FROM `table` grades
WHERE userinfo.`id` = grades.`id` AND
grades.`Item Name` = 'SOMEINFO'
) as SOMENAME,
You are using a subquery that returns two columns in a position where a scalar subquery is expected. A scalar subquery returns one column in at most one row.
Unfortunately, there is no easy way to do what you want in MySQL, because of the restrictions on views. I would advise you to rewrite the logic so the exists is handled using a left join in the from clause.
I have a database table below.
And I want to get list of all DBKey that have: at least one entry with Staled=1, and the last entry is Staled=0
The list should not contain DBKey that has only Staled=0 OR Staled=1.
In this example, the list would be: DBKey=2 and DBKey=3
I think this should do the trick:
SELECT DISTINCT T.DBKey
FROM TABLE T
WHERE
-- checks that the DBKey has at least one entry with Staled = 1
EXISTS (
SELECT DISTINCT Staled
FROM TABLE
WHERE DBKey = T.DBKey
AND Staled = 1
)
-- checks that the last Staled entry for this DBKey is 0
AND EXISTS (
SELECT DISTINCT Staled
FROM TABLE
WHERE DBKey = T.DBKey
AND Staled = 0
AND EntryDateTime = (
SELECT MAX(EntryDateTime)
FROM TABLE
WHERE DBKey = T.DBKey
)
)
Here is a working SQLFiddle of the query, using your sample data.
The idea is to use EXISTS to look for those individual conditions that you've described. I've added comments to my code to explain what each does.
Should be done with a simple JOIN... Starting FIRST with any 1 qualifiers, joined to itself by same key AND 0 staled qualifier AND the 0 record has a higher date. Ensure you have an index on ( DBKey, Staled, EntryDateTime )
SELECT
YT.DBKey,
MAX( YT.EntryDateTime ) as MaxStaled1,
MAX( YT2.EntryDateTime ) as MaxStaled0
from
YourTable YT
JOIN YourTable YT2
ON YT.DBKey = YT2.DBKey
AND YT2.Staled = 0
AND YT.EntryDateTime < YT2.EntryDateTime
where
YT.Staled = 1
group by
YT.DBKey
having
MAX( YT.EntryDateTime ) < MAX( YT2.EntryDateTime )
Maybe this:
With X as
(
Select Row_Number() Over (Partition By DBKey Order By EntryDateTime Desc) RN, DBKey, Staled
From table
)
Select *
From X
Where rn = 1 and staled = 0 and
Exists (select 1 from x x2 where x2.dbkey = x.dbkey and Staled = 1)
I am new to SQL so bear with me. I am returning data from multiple tables. Followed is my SQL (let me know if there is a better approach):
SELECT [NonScrumStory].[IncidentNumber], [NonScrumStory].[Description], [DailyTaskHours].[ActivityDate], [Application].[AppName], [SupportCatagory].[Catagory], [DailyTaskHours].[PK_DailyTaskHours],n [NonScrumStory].[PK_NonScrumStory]
FROM [NonScrumStory], [DailyTaskHours], [Application], [SupportCatagory]
WHERE ([NonScrumStory].[UserId] = 26)
AND ([NonScrumStory].[PK_NonScrumStory] = [DailyTaskHours].[NonScrumStoryId])
AND ([NonScrumStory].[CatagoryId] = [SupportCatagory].[PK_SupportCatagory])
AND ([NonScrumStory].[ApplicationId] = [Application].[PK_Application])
AND ([NonScrumStory].[Deleted] != 1)
AND [DailyTaskHours].[ActivityDate] >= '1/1/1990'
ORDER BY [DailyTaskHours].[ActivityDate] DESC
This is what is being returned:
This is nearly correct. I only want it to return one copy of PK_NonScrumStory though and I can't figure out how. Essentially, I only want it to return one copy so one of the top two rows would not be returned.
You could group by the NonScrumStore columns, and then aggregate the other columns like this:
SELECT [NonScrumStory].[IncidentNumber],
[NonScrumStory].[Description],
MAX( [DailyTaskHours].[ActivityDate]),
MAX( [Application].[AppName]),
MAX([SupportCatagory].[Catagory]),
MAX([DailyTaskHours].[PK_DailyTaskHours]),
[NonScrumStory].[PK_NonScrumStory]
FROM [NonScrumStory],
[DailyTaskHours],
[Application],
[SupportCatagory]
WHERE ([NonScrumStory].[UserId] = 26)
AND ([NonScrumStory].[PK_NonScrumStory] = [DailyTaskHours].[NonScrumStoryId])
AND ([NonScrumStory].[CatagoryId] = [SupportCatagory].[PK_SupportCatagory])
AND ([NonScrumStory].[ApplicationId] = [Application].[PK_Application])
AND ([NonScrumStory].[Deleted] != 1)
AND [DailyTaskHours].[ActivityDate] >= '1/1/1990'
group by [NonScrumStory].[IncidentNumber], [NonScrumStory].[Description],[NonScrumStory].[PK_NonScrumStory]
ORDER BY 3 DESC
From the screenshot it seems DISTINCT should have solved your issue but if not you could use the ROW_NUMBER function.
;WITH CTE AS
(
SELECT ROW_NUMBER() OVER (PARTITION BY [NonScrumStory].[PK_NonScrumStory] ORDER BY [DailyTaskHours].[ActivityDate] DESC) AS RowNum,
[NonScrumStory].[IncidentNumber], [NonScrumStory].[Description], [DailyTaskHours].[ActivityDate], [Application].[AppName], [SupportCatagory].[Catagory], [DailyTaskHours].[PK_DailyTaskHours],n [NonScrumStory].[PK_NonScrumStory]
FROM [NonScrumStory], [DailyTaskHours], [Application], [SupportCatagory]
WHERE ([NonScrumStory].[UserId] = 26)
AND ([NonScrumStory].[PK_NonScrumStory] = [DailyTaskHours].[NonScrumStoryId])
AND ([NonScrumStory].[CatagoryId] = [SupportCatagory].[PK_SupportCatagory])
AND ([NonScrumStory].[ApplicationId] = [Application].[PK_Application])
AND ([NonScrumStory].[Deleted] != 1)
AND [DailyTaskHours].[ActivityDate] >= '1/1/1990'
)
SELECT * FROM CTE WHERE RowNum = 1 ORDER BY [ActivityDate] DESC
I believe if you add DISTINCT to your query that should solve your problem. Like so
SELECT DISTINCT [NonScrumStory].[IncidentNumber], [NonScrumStory].[Description],...
I have 2 two tables questionpool and question where question is a many to one of question pool. I have created a query using a sub select query which returns the correct random results but I need to return more than one column from the question table.
The intent of the query is to return a random test from the 'question' table for each 'QuizID' from the 'Question Pool' table.
SELECT QuestionPool.QuestionPoolID,
(
SELECT TOP (1) Question.QuestionPoolID
FROM Question
WHERE Question.GroupID = QuestionPool.QuestionPoolID
ORDER BY NEWID()
)
FROM QuestionPool
WHERE QuestionPool.QuizID = '5'
OUTER APPLY is suited to this:
Select *
FROM QuestionPool
OUTER APPLY
(
SELECT TOP 1 *
FROM Question
WHERE Question.GroupID = QuestionPool.QuestionPoolID
ORDER BY NEWID()
) x
WHERE QuestionPool.QuizID = '5'
Another example of OUTER APPLY use http://www.ienablemuch.com/2012/04/outer-apply-walkthrough.html
Live test: http://www.sqlfiddle.com/#!3/d8afc/1
create table m(i int, o varchar(10));
insert into m values
(1,'alpha'),(2,'beta'),(3,'delta');
create table x(i int, j varchar, k varchar(10));
insert into x values
(1,'a','hello'),
(1,'b','howdy'),
(2,'x','great'),
(2,'y','super'),
(3,'i','uber'),
(3,'j','neat'),
(3,'a','nice');
select m.*, '' as sep, r.*
from m
outer apply
(
select top 1 *
from x
where i = m.i
order by newid()
) r
Not familiar with SQL server, but I hope this would do:
Select QuestionPool.QuestionPoolID, v.QuestionPoolID, v.xxx -- etc
FROM QuestionPool
JOIN
(
SELECT TOP (1) *
FROM Question
WHERE Question.GroupID = QuestionPool.QuestionPoolID
ORDER BY NEWID()
) AS v ON v.QuestionPoolID = QuestionPool.QuestionPoolID
WHERE QuestionPool.QuizID = '5'
Your query appears to be bringing back an arbitrary Question.QuestionPoolId for each QuestionPool.QuestionPoolId subject to the QuizId filter.
I think the following query does this:
select qp.QuestionPoolId, max(q.QuestionPoolId) as any_QuestionPoolId
from Question q join
qp.QuestionPoolId qp
on q.GroupId = qp.QuestionPoolId
WHERE QuestionPool.QuizID = '5'
group by qp.QuestionPoolId
This returns a particular question.
The following query would allow you to get more fields:
select qp.QuestionPoolId, q.*
from (select q.*, row_number() over (partition by GroupId order by (select NULL)) as randrownum
from Question q
) join
(select qp.QuestionPoolId, max(QuetionPool qp
on q.GroupId = qp.QuestionPoolId
WHERE QuestionPool.QuizID = '5' and
randrownum = 1
This uses the row_number() to arbitrarily enumerate the rows. The "Select NULL" provides the random ordering (alternatively, you could use "order by GroupId".
Common Table Expressions (CTEs) are rather handy for this type of thing...
http://msdn.microsoft.com/en-us/library/ms175972(v=sql.90).aspx