I have this table:
TableA
----------------
ID (pk) Name
1 A
2 B
3 C
4 A
5 D
6 A
7 B
8 A
9 D
10 C
....
I need to randomly extract with a SELECT TOP 5 ID, Name FROM TableA
with Name that must be unique within the 5 records.
I'm trying :
;WITH group
AS
(
SELECT ID, Name,
ROW_NUMBER() OVER (PARTITION BY Name ORDER BY NewId()) rn
FROM TableA
)
SELECT ID, Name
FROM group
WHERE rn = 1
but every time I have quite the same results.
I need to select between all the values for ID at random, assuring that Name will always be different for each record.
I hope the problem is understandable. Any ideas?
Found a solution. It seems to work!
;WITH group
AS (
SELECT ID, Name, ROW_NUMBER() OVER (PARTITION BY Name ORDER BY NewId()) rn FROM TableA )
SELECT top 5 ID, Name, NewId() [NewId]
FROM group
WHERE rn = 1
ORDER BY [newid]
Perhaps the problem is that although newid() is random, it may tend to be sequential. Does this fix the problem?
WITH g as (
SELECT ID, Name,
ROW_NUMBER() OVER (PARTITION BY Name ORDER BY RAND(CHECKSUM(NewId()))) as rn
FROM TableA
)
SELECT ID, Name
FROM g
WHERE rn = 1;
CREATE TABLE #test(ID INT ,Name VARCHAR(1)) INSERT INTO #test(ID ,Name )
SELECT 1,'A' UNION ALL SELECT 2,'B' UNION ALL SELECT 3,'C' UNION ALL
SELECT 4,'A' UNION ALL SELECT 5,'D'UNION ALL SELECT 6,'A' UNION ALL
SELECT 7,'B' UNION ALL SELECT 8,'A'UNION ALL SELECT 9,'D' UNION ALL
SELECT 10,'C'
SELECT T1.ID ,T1.Name FROM #test T1
JOIN ( SELECT TOP 5 Name FROM #test T2 ORDER BY NEWID()
) A ON T1.Name = A.Name ORDER BY A.Name
;WITH group
AS
(
SELECT ID, Name,
ROW_NUMBER() OVER (PARTITION BY Name ORDER BY NewId()) rn
FROM TableA
)
SELECT top 5 ID, Name, NewId() [NewId]
FROM group
WHERE rn = 1
ORDER BY [newid]
Related
I have the below table where names will be inserted first. Then I will get IDs where I need to map with names
ID NAME
null Test1
null Test2
1 null
2 null
I need the result like
ID NAME
1 Test1
2 Test2
I tried below query but it doesn't work for me
select t1.ID , t2.Name from table1 T1 join table1 t2 on T1.id = t2.id
According to screen short you are working with SQL Server , you could try cte expression which may help you
;with cte as
(
select max(id) id, row_number() over (order by (select 1)) rn from
(
select *, rank() over(order by id) rnk from table
) a
group by a.rnk
having max(id) is not null
), cte1 as
(
select max(name) name, row_number() over (order by (select 1)) rn from
(
select *, rank() over(order by name) rnk from table
) a
group by a.rnk
having max(name) is not null
)
select c.id, c1.name from cte c
join cte1 c1 on c1.rn = c.rn
Result :
id name
1 test1
2 test2
I have this table:
I am trying to pull all records from this table for the max value in the DIST_NO column for every distinct ID in the left most column, but I still want to pull every record for each ID in which there are different Product_ID's as well.
I tried partitioning and using row_number, but I am having trouble at the moment.
Here are my desired results:
This is what my code looks like currently:
select *
from
(SELECT *,
ROW_NUMBER() OVER (PARTITION BY ID ORDER BY DIST_NO DESC) RN
FROM Table) V
WHERE RN<=3
you want the max(DIST_NO) for each ID, product_ID?
If so, you can:
SELECT
ID, product_ID, max(DIST_NO)
from table
group by ID, product_ID
If you want the detail rows related to the max row, you just need to join it back to your table:
Select
t.ID, max_dist_no, TRANSaction_ID , LINE_NO , PRODUCT_ID
from
table t inner join
(SELECT
ID, max(DIST_NO) as max_dist_no
from table
group by ID) mx on
t.ID = mx.ID and
t.DIST_NO = max_DIST_NO
Try
SELECT MT.ID
, MT.DIST_NO
, MT.TRANS_ID
, MT.LINE_NO
, MT.PRODUCT_ID
FROM MYTABLE MT
INNER JOIN (
SELECT T.ID, MAX(T.DIST_NO) as DIST_NO FROM MYTABLE T
GROUP BY T.ID
) MAX_MT ON MT.Id = MAX_MT.ID AND MT.DIST_NO = MAX_MT.DIST_NO
The sub query returns each combination of ID and Max value of DIST_NO:
SELECT T.ID, MAX(T.DIST_NO) as DIST_NO FROM MYTABLE T
GROUP BY T.ID
Joining this back to your original table will basically filter your original data-set by only these combinations of values.
Tested on PostgreSQL:
WITH t1 AS (
SELECT id, product_id, MAX(dist_no) AS dist_no
FROM test
GROUP BY 1,2)
SELECT t1.id, t1.dist_no, t2.trans_id, t2.line_no, t1.product_id
FROM test t2, t1
WHERE t1.id=t2.id AND t1.product_id=t2.product_id AND t1.dist_no=t2.dist_no
Use rank() or dense_rank():
select t.*
from (SELECT t.*
RANK() OVER (PARTITION BY ID ORDER BY DIST_NO DESC) as seqnum
FROM Table t
) t
WHERE seqnum = 1;
This is almost a literal translation of your request:
I am trying to pull all records from this table for the max value in
the DIST_NO column for every distinct ID in the left most column.
you can try something like this one :). (But is your result correct? I think there is little mistake in TRANS_ID...)
DECLARE #ExampleTable TABLE
(ID INT,
DIST_NO INT,
TRANS_ID INT,
LINE_NO INT,
PRODUCT_ID INT)
INSERT INTO #ExampleTable
( ID, DIST_NO, TRANS_ID,LINE_NO, PRODUCT_ID )
VALUES ( 102657, 1, 1105365, 1, 109119 ),
( 102657, 1, 1105366, 2, 109114 ),
( 102657, 2, 1105365, 1, 109119 ),
( 102657, 2, 1105366, 2, 109114 ),
( 104371, 1, 1190538, 1, 110981 ),
( 104371, 2, 1190538, 1, 110981 )
;WITH CTE AS ( SELECT DISTINCT ID, LINE_NO
FROM #ExampleTable)
SELECT a.ID,
x.DIST_NO,
x.TRANS_ID,
x.LINE_NO,
x.PRODUCT_ID
FROM CTE a
CROSS APPLY (SELECT TOP 1 *
FROM #ExampleTable f
WHERE a.ID = f.ID AND
a.LINE_NO = f. LINE_NO
ORDER BY DIST_NO DESC) x
I have a table and there are 4 fields in it, ID, Price, QTY, Ratting and Optional [Position].
I have all the records Grouped By Columns [Qty,Ratting]
I have to define the position of groupwise and store that Position into Optional column.
For better understanding I have added an image with data in table:
On the basis of QTY in Each Rating I have to Mark Top3, Bottom3 and Rest of them as remaining.
I am not getting how to do it.
Can anybody suggest me how to do it?
So far what I've tried is:
Declare #RankTable TABLE
(
ID INT,
Price Decimal (10,2),
Qty INT,
Ratting INT
)
INSERT INTO #RankTable
SELECT 1,10,15,1
UNION ALL
SELECT 2,11,11,1
UNION ALL
SELECT 3,96,10,1
UNION ALL
SELECT 4,96,8,1
UNION ALL
SELECT 5,56,7,1
UNION ALL
SELECT 6,74,5,1
UNION ALL
SELECT 7,93,4,1
UNION ALL
SELECT 8,98,2,1
UNION ALL
SELECT 9,12,1,1
UNION ALL
SELECT 10,32,80,2
UNION ALL
SELECT 11,74,68,2
UNION ALL
SELECT 12,58,57,2
UNION ALL
SELECT 13,37,43,2
UNION ALL
SELECT 14,79,32,2
UNION ALL
SELECT 15,29,28,2
UNION ALL
SELECT 16,46,17,2
UNION ALL
SELECT 17,86,13,2
UNION ALL
SELECT 19,75,110,3
UNION ALL
SELECT 20,27,108,3
UNION ALL
SELECT 21,38,104,3
UNION ALL
SELECT 22,87,100,3
UNION ALL
SELECT 23,47,89,3
DECLARE #PositionGroup VARCHAR(1)
SELECT *,ISNULL(#PositionGroup,'') AS Position FROM #RankTable
You can try this:
SELECT ID
,Price
,Qty
,Ratting
,CASE WHEN RowID >= 1 AND RowID <= 3
THEN 0
ELSE CASE WHEN RowID > Total - 3 THEN 1 ELSE 2 END END AS Position
FROM (SELECT ID
,Price
,Qty
,Ratting
,COUNT(*) OVER(PARTITION BY Ratting) AS Total
,ROW_NUMBER() OVER(PARTITION BY Ratting ORDER BY Qty DESC) AS RowID
,ISNULL(#PositionGroup,'') AS Position
FROM #RankTable) AS T
Use Window Function. Try this.
;WITH cte
AS (SELECT *,
Row_number()OVER(partition BY rating ORDER BY id) rn,
count(id)OVER(partition BY rating) mx
FROM #RankTable)
SELECT ID,
Price,
Qty,
Rating,
mx - rn,
CASE WHEN rn IN ( 1, 2, 3 ) THEN 0
WHEN mx - rn IN( 0, 1, 2 ) THEN 1
ELSE 2
END position
FROM cte
try this as well.
;WITH cte AS
(
SELECT MAX(Row) [Max],
MIN(Row) [Min],
LU.Ratting
FROM (
SELECT *,
ROW_NUMBER() OVER(PARTITION BY Ratting ORDER BY Qty DESC) Row
FROM #RankTable)LU
GROUP BY LU.Ratting
)
SELECT ID,
R.Price,
R.Qty,
cte.Ratting,
CASE WHEN (Row - Min) <= 2 THEN 0 WHEN (Max - Row) <= 2 THEN 1 ELSE 2 END Position
FROM cte
JOIN (
SELECT Ratting,
ID,
Price,
Qty,
ROW_NUMBER() OVER(PARTITION BY Ratting ORDER BY Qty DESC) [Row]
FROM #RankTable
) R ON R.Ratting = cte.Ratting
Result:
I have the following table structure:
Id, Message
1, John Doe
2, Jane Smith
3, Error
4, Jane Smith
Is there a way to get the error record and the surrounding records? i.e. find all Errors and the record before and after them.
;WITH numberedlogtable AS
(
SELECT Id,Message,
ROW_NUMBER() OVER (ORDER BY ID) AS RN
FROM logtable
)
SELECT Id,Message
FROM numberedlogtable
WHERE RN IN (SELECT RN+i
FROM numberedlogtable
CROSS JOIN (SELECT -1 AS i UNION ALL SELECT 0 UNION ALL SELECT 1) n
WHERE Message='Error')
WITH err AS
(
SELECT TOP 1 *
FROM log
WHERE message = 'Error'
ORDER BY
id
),
p AS
(
SELECT TOP 1 l.*
FROM log
WHERE id <
(
SELECT id
FROM err
)
ORDER BY
id DESC
)
SELECT TOP 3 *
FROM log
WHERE id >
(
SELECT id
FROM p
)
ORDER BY
id
Adapt this routine to pick out your target.
DECLARE #TargetId int
SET #TargetId = 3
select *
from LogTable
where Id in (-- "before"
select max(Id)
from LogTable
where Id < #TargetId
-- target
union all select #TargetId
-- "after"
union all select min(Id)
from LogTable
where Id > #TargetId)
select id,messag from
(Select (Row_Number() over (order by ID)) as RNO, * from #Temp) as A,
(select SubRNO-1 as A,
SubRNO as B,
SubRNO+1 as C
from (Select (Row_Number() over (order by ID)) as SubRNO, * from #Temp) as C
where messag = 'Error') as B
where A.RNO = B.A or A.RNO = B.B or A.RNO = B.C
;WITH Logs AS
(
SELECT ROW_NUMBER() OVER (ORDER BY id), id, message as rownum FROM LogTable lt
)
SELECT curr.id, prev.id, next.id
FROM Logs curr
LEFT OUTER JOIN Logs prev ON curr.rownum+1=prev.rownum
RIGHT OUTER JOIN Logs next ON curr.rownum-1=next.rownum
WHERE curr.message = 'Error'
select id, message from tbl where id in (
select id from tbl where message = "error"
union
select id-1 from tbl where message = "error"
union
select id+1 from tbl where message = "error"
)
Get fixed number of rows before & after target
Using UNION for a simple, high performance query (I found selected answer WITH query above to be extremely slow)
Here is a high performance alternative to the WITH top selected answer, when you know an ID or specific identifier for a given record, and you want to select a fixed number of records BEFORE and AFTER that record. Requires a number field for ID, or something like date that can be sorted ascending / descending.
Example: You want to select the 10 records before and after a specific error was recorded, you know the error ID, and can sort by date or ID.
The following query gets (inclusive) the 1 result above, the identified record itself, and the 1 record below. After the UNION, the results are sorted again in descending order.
SELECT q.*
FROM(
SELECT TOP 2
id, content
FROM
the_table
WHERE
id >= [ID]
ORDER BY id ASC
UNION
SELECT TOP 1
id, content
FROM
the_table
WHERE
id < [ID]
ORDER BY id DESC
) q
ORDER BY q.id DESC
This should be a simple question, but I can't get it to work :(
How to select rows that have the maximum column value,as group by another column?
For example,
I have the following table definition:
ID
Del_Index
docgroupviewid
The issue now is that I want to group by results by docgroupviewid first, and then choose one row from each docgroupviewid group, depending on which one has the highest del_index.
I tried
SELECT docgroupviewid, max(del_index),id FROM table
group by docgroupviewid
But instead of return me with the correct id, it returns me with the earliest id from the group with the same docgroupviewid.
Any ideas?
I've struggled with this many times myself and the solution is to think about your query differently.
I want each DocGroupViewID row where the Del_Index is the highest(max) for all rows with that DocGroupViewID:
SELECT
T.DocGroupViewID,
T.Del_Index,
T.ID
FROM MyTable T
WHERE T.Del_Index = (
SELECT MAX( T1.Del_Index ) FROM MyTable T1
WHERE T1.DocGroupViewID = T.DocGroupViewID
)
It gets more complex when more than one row can have the same Del_Index, since then you need some way to choose which one to show.
EDIT: wanted to follow up with another option
You can use the RANK() or ROW_NUMBER() functions with a CTE to get more control over the results, as follows:
-- fake a source table
DECLARE #t TABLE (
ID int IDENTITY(1,1) PRIMARY KEY,
Del_Index int,
DocGroupViewID int
)
INSERT INTO #t
SELECT 1, 1 UNION ALL
SELECT 2, 1 UNION ALL
SELECT 3, 1 UNION ALL
SELECT 1, 2 UNION ALL
SELECT 2, 2 UNION ALL
SELECT 2, 2 UNION ALL
SELECT 1, 3 UNION ALL
SELECT 2, 3 UNION ALL
SELECT 3, 3 UNION ALL
SELECT 4, 3
-- show our source
SELECT * FROM #t
-- select using RANK (can have duplicates)
;WITH cteRank AS
(
SELECT
DocGroupViewID,
Del_Index,
ID,
RANK() OVER
(PARTITION BY DocGroupViewID ORDER BY Del_Index DESC)
AS RowRank,
ROW_NUMBER() OVER
(PARTITION BY DocGroupViewID ORDER BY Del_Index DESC)
AS RowNumber
FROM #t
)
SELECT *
FROM cteRank
WHERE RowRank = 1
-- select using ROW_NUMBER
;WITH cteRowNumber AS
(
SELECT
DocGroupViewID,
Del_Index,
ID,
RANK() OVER
(PARTITION BY DocGroupViewID ORDER BY Del_Index DESC)
AS RowRank,
ROW_NUMBER() OVER
(PARTITION BY DocGroupViewID ORDER BY Del_Index DESC)
AS RowNumber
FROM #t
)
SELECT *
FROM cteRowNumber
WHERE RowNumber = 1
If you have ways to sort out ties, just add it to the ORDER BY.
You will have to complicate your query a little bit:
select a.docgroupviewid, a.del_index, a.id from table a
where a.del_index = (select max(b.del_index) from table
where b.docgroupviewid = a.docgroupviewid)