I have the following table for which I need to get the latest values for the group ( name , address ).
This means I need to have the max(time) for each ( name, address ) couple and get the last_read for that time value.
How can I do that in one select query ?
I think below should work for you, you need to use GROUP BY and MAX
select max([time]),
[name],
[address]
from yourTable
group by [name],
[address]
EDIT
You can try other answers or check below, which uses temp table
select max([time]) as last_read_time,
[name],
[address]
into #temp_table
from yourTable
group by [name],
[address]
select last_read
from yourTable as yt
inner join #temp_table t
on yt.[name] = t.[name]
and yt.[time] = t.last_read_time
IF OBJECT_ID('tempdb..#temp_table', 'U') IS NOT NULL
In most databases, a correlated subquery is a good approach:
select t.*
from t
where t.time = (select max(t2.time)
from t t2
where t2.name = t.name and t2.address = t.address
);
In particular, this can take advantage of an index on (name, address, time).
you can use row_number() if your dbms support
select * from
(select *,row_number() over(partition by name,address order by time desc) rn
) t where t.rn=1
None of the above solutions worked.
I finally found the following query that works :
select
l2.MAX t,
l.name,
l.address,
l.last_read
from links_data l
inner join (select name,
address,
max(time) as "MAX"
from links_data
group by name, address) l2
on l.name = l2.name
and l.address = l2.address
and l.time = l2.MAX;
Thanks everyone.
Related
i'm trying to get a inner join from two select sentences but it doesn't work, what i am doing wrong?
i cant work with internal tables because inner join doesn't permit it.
clear: it_spfli.
refresh: it_spfli.
select
spfli-cityto
spfli-cityfrom
into TABLE it_spfli from(select spfli-cityto COUNT( * )from spfli group by spfli-cityto) as t1
INNER JOIN(select spfli-cityfrom COUNT( * )from spfli group by spfli-cityfrom) as t2
ON t1-cityto = t2-cityfrom.
i expect a table of more frequency city to and city from order by city to with table spfli.
First of all i don't think you are doing the right SELECT to get what you want.
I answer this question from the technical perspective. You can use WITH.
WITH +spf1 AS (
SELECT spfli~cityto AS cityto, COUNT(*) AS count FROM spfli GROUP BY spfli~cityto ) ,
+spf2 AS (
SELECT spfli~cityfrom AS cityfrom , COUNT(*) AS count FROM spfli GROUP BY spfli~cityfrom ) ,
+spf3 AS (
SELECT s1~cityto, s2~cityfrom FROM +spf1 AS s1 INNER JOIN +spf2 AS s2
ON s1~cityto = s2~cityfrom )
SELECT * FROM +spf3 INTO TABLE #DATA(lt_result).
I have a query
with x as
(select row_number() over(partition by FirstName order by Investment_DT desc) as rn, *
from [dbSuppHousing].[dbo].[tblABC])
select Login_Name
,r.Role_Name
,Investment_DT
,FirstName
,LastName
,Login_Name
,Investment_DT
,Investment_ID
from x join tblUsers t
on t.UserName = x.Login_Name
join tblUser_Roles ur on t.User_Id=ur.USER_ID
join tblRoles r on r.Role_Id=ur.Role_ID
where x.rn = 1
order by x.FirstName
I want to insert the result of this query into another table as is.
Typically I use a query like:
insert into tblABC2
select * from tblABC
But I'm not sure how to do this in this case which is a query which begins with with x as
with x as
(select row_number() over(partition by FirstName order by Investment_DT desc) as rn, *
from [dbSuppHousing].[dbo].[tblABC])
select Login_Name
,r.Role_Name
,Investment_DT
,FirstName
,LastName
,Login_Name
,Investment_DT
,Investment_ID
into #temptable
from x join tblUsers t
on t.UserName = x.Login_Name
join tblUser_Roles ur on t.User_Id=ur.USER_ID
join tblRoles r on r.Role_Id=ur.Role_ID
where x.rn = 1
-- order by x.FirstName
You can use into to insert into the table you need. Also note that you can't do an order by when doing this (which has been commented out).
with x as (...) insert into tbl select * from x
So, insert should be directly after all CTEs used in the query.
You simply need to put the insert statement between the common table expression (CTE) and your select statement:
with x as
(select row_number() over(partition by FirstName order by Investment_DT desc) as rn, *
from [dbSuppHousing].[dbo].[tblABC])
/*
place insert statement here
*/
select Login_Name
,r.Role_Name
,Investment_DT
,FirstName
,LastName
,Login_Name
,Investment_DT
,Investment_ID
from x join tblUsers t
on t.UserName = x.Login_Name
join tblUser_Roles ur on t.User_Id=ur.USER_ID
join tblRoles r on r.Role_Id=ur.Role_ID
where x.rn = 1
order by x.FirstName
If you are running this on SQL Server 2008+, you need to ensure that any statement previous to the CTE is terminated with a semicolon.
My query is taking very long time.
select distinct JobName,
ValidationType,
AppName,
Result,
ResultType,
ErrorWarningDetails,
CvtStartDateTime
from contentvalidationjobdetails with (nolock)
where appname=#AppName
and result=#Result
and (cast(cvtstartdatetime as date) > #Date )
and concat(Jobname,validationtype) not in (
select concat(jobname,validationtype)
from Contentvalidationjobdetails with (nolock)
where appname = #AppName
and CVTStartDateTime = (
select top 1 teststartdatetime
from contentvalidation
where appname=#AppName
and Teststartdatetime<#Date
order by teststartdatetime desc
)
)
I know that the concat(jobname,validationtype) is taking time. how to handle this.
Place the query in FROm section to be executed just once (not for each line in WHERE). Add outer join and leave only records which has no joins.
select distinct JobName,
ValidationType,
AppName,
Result,
ResultType,
ErrorWarningDetails,
CvtStartDateTime
from contentvalidationjobdetails with (nolock)
LEFT OUTER JOIN (
select concat(jobname,validationtype) cnt
from Contentvalidationjobdetails with (nolock)
where appname = #AppName
and CVTStartDateTime = (
select top 1 teststartdatetime
from contentvalidation
where appname=#AppName
and Teststartdatetime<#Date
order by teststartdatetime desc) sub ON concat(Jobname,validationtype)=sub.cnt
where appname=#AppName
and result=#Result
and (cast(cvtstartdatetime as date) > #Date ))
HAVING sub.cnt is null
I'm not a DBA so please don't yell at me. Trying to do an inner join and Group By using a concatenated column. The ON statement is producing a syntax error. I do not have access to the original tables and am trying to normalize this into another table, I know its ugly. Not overly worried about performance, just need to work. Cant use functions either.
SELECT DISTINCT A.[carrier_code],[carrier_name], [carrier_grouping], A.[collector_name], [dataset_loaded], [docnum], [envoy_payer_id], [loc], [market], [master_payor_grouping], [plan_class], [plan_name], A.[resp_ins],A.[resp_ind], A.[resp_payor_grouping], A.[Resp_Plan_Type], A.[rspphone], A.[state], A.[sys],A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] as ExtId
FROM [Table1] A
INNER JOIN
(SELECT [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as Extid
FROM [Table1]
WHERE [resp_ind] = 'Insurance'
GROUP BY [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name]) B
ON A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] = B.[resp_ins]+B.[resp_payor_grouping]+B.[carrier_code]+B.[state]+B.[Collector_Name];
My ON and Group By statements are eventually the primary key in new table.
Your alias B hasn't columns as you mentioned. It has just on column Extid.
SELECT DISTINCT A.[carrier_code],[carrier_name], [carrier_grouping], A.[collector_name], [dataset_loaded], [docnum], [envoy_payer_id], [loc], [market], [master_payor_grouping], [plan_class], [plan_name], A.[resp_ins],A.[resp_ind], A.[resp_payor_grouping], A.[Resp_Plan_Type], A.[rspphone], A.[state], A.[sys],A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] as ExtId
FROM [Table1] A
INNER JOIN
(SELECT [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as Extid
FROM [Table1]
WHERE [resp_ind] = 'Insurance'
GROUP BY [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name]) B
ON A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] = B.Extid;
Try this, I didn't put all the column in result, you can manage yourself.
select A.*
from
(
select [carrier_code],[carrier_name], [sys],[resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as ExtId
FROM [Table1]
) A
inner join
(
select distinct Extid
from
(
SELECT [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as ExtId
FROM [Table1]
WHERE [resp_ind] = 'Insurance'
) ins
) B on (A.ExtId = B.ExtId)
You don't need to concatenate the values - you can GROUP BY and JOIN on multiple columns.
SELECT DISTINCT
...
FROM
[Table1] A
INNER JOIN
(
SELECT
[resp_ins],
[resp_payor_grouping],
[carrier_code],
[state],
[Collector_Name]
FROM
[Table1]
WHERE
[resp_ind] = 'Insurance'
GROUP BY
[resp_ins],
[resp_payor_grouping],
[carrier_code],
[state],
[Collector_Name]
) B
ON
(
A.[resp_ins] = B.[resp_ins]
Or
(A.[resp_ins] Is Null And B.[resp_ins] Is Null)
)
And
(
A.[resp_payor_grouping] = B.[resp_payor_grouping]
Or
(A.[resp_payor_grouping] Is Null And B.[resp_payor_grouping] Is Null)
)
And
(
A.[carrier_code] = B.[carrier_code]
Or
(A.[carrier_code] Is Null And B.[carrier_code] Is Null)
)
And
(
A.[state] = B.[state]
Or
(A.[state] Is Null And B.[state] Is Null)
)
And
(
A.[Collector_Name] = B.[Collector_Name]
Or
(A.[Collector_Name] Is Null And B.[Collector_Name] Is Null)
)
;
the first query:
SELECT u.id , prop1.id
FROM ( SELECT '9fbc6e9b59504c08ac643752c1e2d033' AS id ,
'|6813dbbfec6241a19b8d2316d2cb2a65,1|' AS customprop
UNION
SELECT 'f2271c45682f45fc84527c4afff0ab16' AS id ,
'|6813dbbfec6241a19b8d2316d2cb2a65,2|' AS customprop
) u
INNER JOIN ( SELECT ROW_NUMBER() OVER ( ORDER BY a.Id ) id ,
A.Id propId ,
B.NAME
FROM ( SELECT '6813dbbfec6241a19b8d2316d2cb2a65' AS id ,
CONVERT(XML, '<v>1,职业资格1</v><v>2,职业资格2</v>') AS value
) A
OUTER APPLY ( SELECT Name = N.v.value('.',
'nvarchar(Max)')
FROM A.[VALUE].nodes('/v') N ( v )
) B
) prop1 ON CHARINDEX('|' + prop1.propid + ','
+ CONVERT(NVARCHAR(10), prop1.id)
+ '|', u.customprop) > 0
GROUP BY u.id ,
prop1.id
the second query:
SELECT u.id ,prop1.id, count(*)
FROM ( SELECT '9fbc6e9b59504c08ac643752c1e2d033' AS id ,
'|6813dbbfec6241a19b8d2316d2cb2a65,1|' AS customprop
UNION
SELECT 'f2271c45682f45fc84527c4afff0ab16' AS id ,
'|6813dbbfec6241a19b8d2316d2cb2a65,2|' AS customprop
) u
INNER JOIN ( SELECT ROW_NUMBER() OVER ( ORDER BY a.Id ) id ,
A.Id propId ,
B.NAME
FROM ( SELECT '6813dbbfec6241a19b8d2316d2cb2a65' AS id ,
CONVERT(XML, '<v>1,职业资格1</v><v>2,职业资格2</v>') AS value
) A
OUTER APPLY ( SELECT Name = N.v.value('.',
'nvarchar(Max)')
FROM A.[VALUE].nodes('/v') N ( v )
) B
) prop1 ON CHARINDEX('|' + prop1.propid + ','
+ CONVERT(NVARCHAR(10), prop1.id)
+ '|', u.customprop) > 0
GROUP BY u.id ,
prop1.id
sql can be executed on sqlserver 2005 directly.
the first query can produce one item and the second query produce two items.
I think that the two queries should both produce two items.
I have thouht for three days and I really want to konw why.
I'm a Chinese and my English is poor.I hope you can understand my description
Tough question, but the problem is with this line:
INNER JOIN ( SELECT ROW_NUMBER() OVER ( ORDER BY a.Id ) id ,
The ORDER BY is ambiguous and consequently, if it is executed multiple times (which it can be because of the INNER JOIN it is contained in), it may not always return the same ordering/assignment. This can cause a latter join condition to only match on one record instead of two, which is what happens in the query plan being used for the version without the count(*) column.
To fix this, you just need to add something to make the ordering assignment unique, like this:
INNER JOIN ( SELECT ROW_NUMBER() OVER ( ORDER BY a.Id, B.Name ASC ) id ,
Try it like this, it should work.
Your problem is with the ORDER BY clause of the ROW_NUMBER - since the a.ID is not unique the outcome is unpredictable. Make that unique and your problem will go away - you can use something like
...SELECT ROW_NUMBER() OVER ( ORDER BY newid() ) id...