SQL Query using distinct and max - sql

I have a dataset like:
type seqID text
A 1 Text1a
A 2 Text2a
A 3 Text3a
B 1 Text1b
B 2 Text2b
How do I get the row back by type with the highest seqID grouped by type? So in the above example I would want the row that has A, 3, Text3a and B, 2, Text2b returned.

SELECT *
FROM tmp t1
WHERE NOT EXISTS
(SELECT 1 FROM tmp t2 WHERE t1.type = t2.type AND t2.seqID > t1.seqID)
It shouldn't exists any other row with the same type and higher seqID.

You kind of need an ID, but since "Text" seems unique for this example
CREATE TABLE #TMP
(type VARCHAR(3), seqID INT, [text] varchar(256))
insert #TMP values ('A' , 1 , 'Text1a')
insert #TMP values ('A' , 2 , 'Text2a')
insert #TMP values ('A' , 3 , 'Text3a')
insert #TMP values ('B' , 1 , 'Text1b')
insert #TMP values ('B' , 2 , 'Text2b')
SELECT * FROM #TMP T
where [text] IN
(SELECT TOP 1 [text] FROM #TMP t2 WHERE t.type = t2.type ORDER BY t2.seqID DESC)

SELECT tbl.*
FROM
( SELECT type, MAX(seqID)
FROM tbl
GROUP BY type) maxes
WHERE
tbl.type= maxes.type AND
tbl.seqID= maxes.seqID

SELECT t.* FROM
(
SELECT type, MAX(seqID) as maxId
FROM Table
GROUP BY type
) m
INNER JOIN Table t ON m.maxId = t.seqId
Using CTE
;WITH maxIds(maxId)
AS
(
SELECT type, MAX(seqID) as maxId
FROM Table
GROUP BY type
)
SELECT t.* FROM
Table t
INNER JOIN maxIds m ON m.maxId = t.seqID

If you are on SQL Server 2005+, you could use a ranking function (more specifically, ROW_NUMBER()):
SELECT
type,
seqID,
text
FROM (
SELECT
*,
rnk = ROW_NUMBER() OVER (PARTITION BY type ORDER BY seqID DESC)
FROM atable
) s
WHERE rnk = 1

create table #tlb1(
[type] VARCHAR(3), seqID INT, [text] varchar(max)
)
declare #type varchar(3), #text varchar(max);
declare #seqID int;
declare seq_cursor cursor for
select [type], max(seqID) from tbl group by [type]
open seq_cursor
fetch next from seq_cursor into #type,#seqID
while(##fetch_status=0)
begin
set #text= (select [text] from tbl where [type]=#type and seqID=#seqid);
insert into #tlb1 values (#type, #seqID,#text);
fetch next from seq_cursor into #type,#seqID
end
select * from #tlb1
close seq_cursor
deallocate seq_cursor
truncate table #tlb1

Try:
SELECT type, max(seqID),text
FROM 'db'
GROUP BY type
As easy as that.

EDITED solution. Consider this a psuedo-code (since I am not familiar with SQL server syntax):
SELECT a.type, a.seqID, a.text FROM table a
JOIN
(SELECT type, max(seqID) seqID FROM table GROUP BY type) b
ON a.seqID = b.seqID AND a.type=b.type

Related

Need to return an ID which has start and END in sql server

I have a scenario wherein I need to find the ID which only has start and END in it. Below is the table for reference.
Declare #T Table ( ID int, Name varchar(100))
Insert into #T values (1,'Start')
Insert into #T values (1,'END')
Insert into #T values (1,'Stuart')
Insert into #T values (1,'robin')
Insert into #T values (2,'Start')
Insert into #T values (2,'END')
Insert into #T values (3,'Start')
Insert into #T values (4,'END')
I want the Output as:
ID Name
2 Start
2 END
I want those ID which only has start and end in it.
What I tried so far:
SELECT * FROM #T t
WHERE EXISTS (SELECT * FROM #T WHERE id = t.id AND name = 'start')
AND EXISTS (SELECT * FROM #T WHERE id = t.id AND name = 'END')
But my query is giving ID 1 as well.
Can someone please help me rectify the problem.
I presume your issue is that record 1 has a 'Stuart' in it too?
As such, you can do a similar check in the WHERE e.g.,
SELECT * FROM #T t
WHERE EXISTS (SELECT * FROM #T WHERE id = t.id AND name = 'start')
AND EXISTS (SELECT * FROM #T WHERE id = t.id AND name = 'END')
AND NOT EXISTS (SELECT * FROM #T WHERE id = t.id AND name NOT IN ('start','END'))
Note that you may want to consider
What happens if you have two 'start' rows or two 'end' rows (e.g., start-start-end)? Can you even have two 'start' rows (e.g., start-start)?
What happens if you have a blank/NULL (e.g., start-NULL-end)?
EDIT: removed 'What happens if they're out of order (e.g., end-start)?' as a question as there is no sorting in the data at all (e.g., not even an implicit sort).
You can go for CTE to get group wise count and total count as 2.
Declare #T Table ( ID int, Name varchar(100))
Insert into #T values (1,'Start')
Insert into #T values (1,'END')
Insert into #T values (1,'Stuart')
Insert into #T values (1,'robin')
Insert into #T values (2,'Start')
Insert into #T values (2,'END')
Insert into #T values (3,'Start')
Insert into #T values (4,'END')
;WITH CTE_Total_StartEnd AS
(
select id, count(*) AS Total_Cnt
, COUNT( case when Name IN ('Start') THEN 1 END) as start_cnt
, COUNT( case when Name IN ('End') THEN 1 END) as end_cnt
from #t
group by id
having COUNT( case when Name IN ('Start') THEN 1 END) =1 and
COUNT( case when Name IN ('End') THEN 1 END) = 1 and
count(*) = 2
)
SELECT t.* from #t t
inner join CTE_Total_StartEnd as c
ON c.id = t.id
+----+-------+
| ID | Name |
+----+-------+
| 2 | Start |
| 2 | END |
+----+-------+
You can do this by using group by function also like below
WITH cte AS
(
SELECT 1 AS id , 'Start' AS name
UNION ALL
SELECT 1 AS id ,'END' AS name
UNION ALL
SELECT 1 AS id ,'Stuart' AS name
UNION ALL
SELECT 1 AS id ,'robin' AS name
UNION ALL
SELECT 2 AS id ,'Start' AS name
UNION ALL
SELECT 2 AS id ,'END' AS name
UNION ALL
SELECT 3 AS id ,'Start' AS name
UNION ALL
SELECT 4 AS id ,'END' AS name
)
SELECT T.ID,SUM(T.VAL)AS SUM
FROM
(
SELECT id,name , CASE WHEN name='Start' THEN 1
WHEN name='END' THEN 2
ELSE 3
END AS VAL
FROM cte
)T
GROUP BY T.ID
HAVING SUM(T.VAL) =3
could you please try this? Pls note i added collate command in the end of sql.
SQL Server check case-sensitivity?
SELECT * FROM #T t
WHERE EXISTS (SELECT * FROM #T WHERE id = t.id AND name = 'start' COLLATE SQL_Latin1_General_CP1_CS_AS)
AND EXISTS (SELECT * FROM #T WHERE id = t.id AND name = 'END' COLLATE SQL_Latin1_General_CP1_CS_AS)

How to get the each record with some condition

I have following data:
DECLARE #temp TABLE (
ID int
,sn varchar(200)
,comment varchar(2000)
,rownumber int
)
insert into #temp values(1,'sn1',NULL,1)
insert into #temp values(2,'sn1','aaa',2)
insert into #temp values(3,'sn1','bbb',3)
insert into #temp values(4,'sn1',NULL,4)
insert into #temp values(5,'sn2',NULL,1)
insert into #temp values(6,'sn2',NULL,2)
insert into #temp values(7,'sn2',NULL,3)
select * from #temp
And I want to output like this:
2 sn1 aaa 2
5 sn2 NULL 1
same sn, if comment have value, get this lower rownumber's record. For sn1, have two records with comment value, so here, get the the record with rownumber=2
If comment doesn't have value, get the lower rownumber's record. For sn2, get the record with rownumber=1
May I know how to write this SQL?
This is a prioritization query. I think row_number() is the simplest method:
select t.*
from (select t.*,
row_number() over (partition by sn
order by (case when comment is not null then 1 else 2 end),
rownumber
) as seqnum
from #temp t
) t
where seqnum = 1;
Here is a db<>fiddle.

Selection One Entry Only As Non Zero In SQl Select

I have a scenario where I have to select multiple rows from table, I have multiple rows of one record but with different status,
at times I have two identical rows with identical data for status < for that case I canted to select Non zero for the first occurrence and set 0 for the remaining occurrences.
Below is the Image to show and I have marked strike-out and marked 0 for the remaining occurrence.
And body could suggest better SQL Query:
Here is the Query: I am getting zero value for status 1 for ID =1 but I need to show first as regular and then 0 if that status repeats again.
CREATE TABLE #Temp
(ID INT,
ItemName varchar(10),
Price Money,
[Status] INT,
[Date] Datetime)
INSERT INTO #Temp VALUES(1,'ABC',10,1,'2014-08-27')
INSERT INTO #Temp VALUES(1,'ABC',10,2,'2014-08-27')
INSERT INTO #Temp VALUES(1,'ABC',10,1,'2014-08-28')
INSERT INTO #Temp VALUES(2,'DEF',25,1,'2014-08-26')
INSERT INTO #Temp VALUES(2,'DEF',25,3,'2014-08-27')
INSERT INTO #Temp VALUES(2,'DEF',25,1,'2014-08-28')
INSERT INTO #Temp VALUES(3,'GHI',30,1,'2014-08-27')
SELECT CASE WHEN Temp.Status = 1 THEN
0
ELSE
Temp.Price END AS Price,
* FROM (SELECT * FROM #Temp) Temp
DROP TABLE #Temp
Here is the result:
You might modify your inner select using Row_Number() and set price to Zero for RowNumber > 1.
SELECT CASE WHEN Temp.RowNumber > 1 THEN
0
ELSE
Temp.Price END AS Price,
* FROM (
SELECT *,Row_Number() over (PARTITION by ID,Status ORDER BY ID,Date) AS 'RowNumber'
FROM #Temp
) Temp
Order by ID,Date
You can try this:
;WITH DataSource AS
(
SELECT RANK() OVER (PARTITION BY [ID], [ItemName], [Price], [Status] ORDER BY Date) AS [RankID]
,*
FROM #Temp
)
SELECT [ID]
,[ItemName]
,IIF([RankID] = 1, [Price], 0)
,[Status]
,[Date]
FROM DataSource
ORDER BY [ID]
,[Date]
Here is the output:
please try this below code . it is working for me.
CREATE TABLE #Temp
(ID INT,
ItemName varchar(10),
Price Money,
[Status] INT,
[Date] Datetime)
INSERT INTO #Temp VALUES(1,'ABC',10,1,'2014-08-27')
INSERT INTO #Temp VALUES(1,'ABC',10,2,'2014-08-27')
INSERT INTO #Temp VALUES(1,'ABC',10,1,'2014-08-28')
INSERT INTO #Temp VALUES(2,'DEF',25,1,'2014-08-26')
INSERT INTO #Temp VALUES(2,'DEF',25,3,'2014-08-27')
INSERT INTO #Temp VALUES(2,'DEF',25,1,'2014-08-28')
INSERT INTO #Temp VALUES(3,'GHI',30,1,'2014-08-27')
select *,case when a.rn=1 and status!=2 then price else 0 end as price from
(select *,ROW_NUMBER() over(partition by status,date order by date asc) rn from #Temp) a
order by ItemName asc
You can do this with UNION:
SELECT * FROM #Temp t
WHERE NOT EXISTS
(SELECT * FROM #Temp
WHERE t.id = id and t.status = status and t.date < date)
UNION ALL
SELECT ID, ItemName, 0 as Price, status, date
WHERE EXISTS
(SELECT * FROM #Temp
WHERE t.id = id and t.status = status and t.date < date)
Or subquery:
SELECT CASE
WHEN (SELECT COUNT(*)
FROM #Temp
WHERE t.id = id and t.status = status
and t.date > date) > 1 THEN 0 ELSE price END as NewPrice, t.*
FROM #Temp t
Or possibly RANK() function:
SELECT CASE
WHEN RANK() OVER (PARTITION BY id, status ORDER BY date) > 1
THEN 0 ELSE Price END,
t.*
FROM #Temp t

Select item type and its base type in SQL Server?

I have a simple table :
DECLARE #t TABLE(item INT, itemType INT )
insert INTO #t SELECT 1000,0
insert INTO #t SELECT 1000,3
insert INTO #t SELECT 1000,5
insert INTO #t SELECT 1000,6
insert INTO #t SELECT 2000,0
insert INTO #t SELECT 2000,3
insert INTO #t SELECT 2000,5
insert INTO #t SELECT 2000,6
insert INTO #t SELECT 3000,0
insert INTO #t SELECT 3000,10
insert INTO #t SELECT 4000,11
I want to select all items where itemtype = 3 but if there is a row , provide also its base itemtype (if it exists) which is itemType = 0.
For example :
for itemType = 3
1000,0 should be provided --why ? because table also has 1000 + itemType 0
1000,3 should be provided --why ? because we looked for itemType=3
2000,0 should be provided --why ? because table has found 2000,3 and this 2000 also has itemType=0
2000,3 should be provided --why ? because we looked for itemType=3
for itemType = 10
3000,0 should be provided --why ? because table has found 3000,10 and this 3000 also has itemType=0
3000,10 should be provided --why ? because we looked for itemType=10
for itemType = 11
4000,11 should be provided --why ? because we looked for itemType=11 ( notice , there isn't itemType 0 , so only itself).
I started doing :
;with cte as(
SELECT * FROM #t
)
select * from cte where itemType=3
In summary, if the itemType is found, provide itself + its zero type (if exists), and also for his siblings ( sample(#1) )
But I can't do union here cause CTE is not recognized there... rubbish. it is possible.
How can I solve it ?
SQL ONLINE
To avoid evaluating the itemType = 3 query twice you can self outer join then use CROSS APPLY ... VALUES to UNPIVOT
DECLARE #itemType INT = 3;
WITH T(item1, itemType1, item2, itemType2 )
AS (SELECT *
FROM #t T1
LEFT JOIN #t T2
ON T1.item = T2.item
AND T2.itemType = 0
AND T1.itemType <> 0
WHERE T1.itemType = #itemType)
SELECT item,
itemType
FROM T
CROSS APPLY ( VALUES (item1, itemType1),
(item2, itemType2) ) v(item, itemType)
WHERE item IS NOT NULL
SQL Fiddle
Execution Plans
DECLARE #findtype INT = 3;
WITH results AS
(
SELECT t.item, #findtype
FROM #t t
WHERE t.itemType = #findtype
UNION ALL
SELECT t.item, 0
FROM #t t
INNER JOIN results r on r.item = t.item
WHERE t.itemType = 0
)
SELECT *
FROM results;
WITH recordList
AS
(
SELECT item, itemType
FROM SampleTable
WHERE itemType = 11 -- change here
)
SELECT item, itemType FROM recordList
UNION
SELECT a.item, a.itemType
FROM SampleTable a
INNER JOIN recordList b
ON a.item = b.item
WHERE a.itemtype = 0
SQLFiddle Demo
SQLFiddle Demo (using IN clause for multiple values)

How to pivot column values of the below table?

TableA:
Brand Product
------------------
A X
A XX
A XXX
B Y
B YY
C Z
I need data as shown in Table below:
A B C
-------------------
X Y Z
XX YY NULL
XXX NULL NULL
How to do that in Sql Server 2008 ?
I dont beleive a PIVOT is what you are looking for here.
From what I can see you are looking at using the entries in order to generate the rows?
Also, PIVOTs make use of aggregate functions, so I cant see this happening.
What you can try, is something like
DECLARE #Table TABLE(
Brand VARCHAR(10),
Product VARCHAR(10)
)
INSERT INTO #Table SELECT 'A','X '
INSERT INTO #Table SELECT 'A','XX'
INSERT INTO #Table SELECT 'A','XXX'
INSERT INTO #Table SELECT 'B','Y'
INSERT INTO #Table SELECT 'B','YY'
INSERT INTO #Table SELECT 'C','Z'
;WITH Vals AS (
SELECT *,
ROW_NUMBER() OVER(PARTITION BY Brand ORDER BY (SELECT NULL)) RID
FROM #Table
)
, RIDs AS (
SELECT DISTINCT
RID
FROM Vals
)
SELECT vA.Product [A],
vB.Product [B],
vC.Product [C]
FROM RIDs r LEFT JOIN
Vals vA ON r.RID = vA.RID
AND vA.Brand = 'A' LEFT JOIN
Vals vB ON r.RID = vB.RID
AND vB.Brand = 'B' LEFT JOIN
Vals vC ON r.RID = vC.RID
AND vC.Brand = 'C'
I know it is a late entry, but here is a different approach to solve it:
DECLARE #Table TABLE(Brand VARCHAR(10), Product VARCHAR(10))
INSERT INTO #Table SELECT 'A','X '
INSERT INTO #Table SELECT 'A','XX'
INSERT INTO #Table SELECT 'A','XXX'
INSERT INTO #Table SELECT 'B','Y'
INSERT INTO #Table SELECT 'B','YY'
INSERT INTO #Table SELECT 'C','Z'
SELECT [A],[B],[C] FROM (
SELECT row_number() over (partition by brand order by product) rn,
Product, brand FROM #table
) as p
PIVOT(
MAX(product) for Brand in ([A],[B],[C])
)as pvt