SQL Server 2014 :: Group Up Records Randomly Into N Number Of Batches
Jul 6, 2015
I need to group up the records randomly into ‘n’ number of batches. That can be done by NTILE, but I want group up similar records in single group.
Say for example, following is the list of records I have in my table which I want to group into 5 batches
A123
A124
A124
A123
A127
After Ntile I will get the below,
Desired output is, Need output like Ntile but all same id should reside in single batch
Even if I n=5, maximum possibility of batches are 3 only.
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Dec 19, 2014
Sample Data
SET NOCOUNT ON;
USE tempdb;
GO
CREATE TABLE CheckRegistry (
CheckNumber smallint,
[code]...
How can I get the result orderd by the month number?
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Aug 6, 2014
I'm trying to do the following and haven't been able to figure it out.
Say there's a table with these records:
Col1 Col2 Col3
a b c
a b c
a b d
e f g
e f g
I want to generate a number that represents the groups of columns like this:
Col1 Col2 Col3 MyNumber
a b c 1
a b c 1
a b d 2
e f g 3
e f g 3
So that each grouping gets its own identifier. I've tried this:
SELECT Col1, Col2, Col3
row_number() OVER (PARTITION BY Col1, Col2, Col3
ORDER BY Col1, Col2, Col3) AS MyNumber
FROM MyTable
But I get this:
Col1 Col2 Col3 MyNumber
a b c 1
a b c 2
a b d 1
e f g 1
e f g 2
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Jul 16, 2014
I have duplicate records in table.I need to count duplicate records based upon Account number and count will be stored in a variable.i need to check whether count > 0 or not in stored procedure.I have used below query.It is not working.
SELECT @_Stat_Count= count(*),L1.AcctNo,L1.ReceivedFileID from Legacy L1,Legacy L2,ReceivedFiles where L1.ReceivedFileID = ReceivedFiles.ReceivedFileID
and L1.AcctNo=L2.AcctNo group by L1.AcctNo,L1.ReceivedFileID having Count(*)> 0
IF (@_Stat_Count >0)
BEGIN
SELECT @Status = status_cd from status-table where status_id = 10
END
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Nov 10, 2014
I have 2 tables with this schema
CREATE TABLE tableValues(
[LASTENCRYPTIONDT] [datetime] NULL,
[ENCRYPTIONID] [int] NULL,
[NAME] [varchar](50) NULL
[Code] ....
I want to update tableToUpdate in batches of 5000 per batch and set the lastenecryptionDT to null based on the the join to the tableValues using the column ENCRYPTIONID, and also output updated rows into another table. Incase I would need to do a rollback.
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Mar 19, 2008
Hai friends,,
I have a table name "Student"
it contain 2 fields no ,name
no name
1 Raja
2 Larsen
3 Ravi
4 Ankit
5 Eban
my questions is I have a webform random.aspx
whenever any user open a webform random.aspx
it should display anyone of name in a random order..... CODING:-
Dim cn As New System.Data.sqlclient.SqlConnectionDim rd As sqlDataReader
cn.ConnectionString = "Persist Security Info=False;User ID=sa;Initial Catalog=master;password=david;"
cn.Open()Dim cmd1 As New SqlCommand("select no,name from Student", cn) ' how i can chage to random order....
rd = cmd1.ExecuteReader
rd.Read()
Response.Write(rd(0) & "." & rd(1))
rd.Close()
thank u..
Ambrose...
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Mar 19, 2014
create table #sample
(
Name varchar(100),
value int
[code]....
From that I wanted to delete some records based on following condition. randomly select any number of records but sum(value) = 125 and name = xxx
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Oct 23, 2014
My issue is that I have 10 accounts that were assigned to 5 agents with each agent receiving 2 accounts. I would know like to randomly reassign the accounts with the only criteria being that the random allocation not reassign to the same agency and each agent gets 2 accounts again.
Data looks like below and I want to populate the randomly assigned agent in the "Second_Agent" column.
Account,First_Agent,Second_Agent
B1,1,
B2,1,
B3,2,
B4,2,
B5,3,
B6,3,
B7,4,
B8,4,
B9,5,
B10,5,
How to most effectively achieve this using SQL?
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Jan 29, 2008
I'm looking for a bit of SQL code that will select some entries randomly from an SQL table.
For instance I'd like to feed a parameter in that contains the number
20, and the returned record contains 20 randomly and distinct selected
records.
Anyone know how this can be done? (never came across randomly select records) Appreciate any help
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Apr 10, 2001
I need to randomly pick one or more records from a query e.g
select c_id, c_name
from c_table
where cat_id = 52
There may be more than one records for cat_id = 52. and I need to pick 3 of them randomly.
Thanks in advance!
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Oct 17, 2007
Hi
i have created a quiz software in VB. i have used ini files to fetch questions.. now i have thought of changing it to SQL.. i have created a table with questionno, question, option1,option2,option3,option4 and the correctanswer.. now i want to select the questions randomly each time the question session is started.. please help me out as i need to complete this project for my school...
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Feb 1, 2005
I have a web app that calculates tax filing status and then stores data about the person.
Facts
The insert is done through a stored procedure.
All the sites that this program is being used are connecting through a VPN so this is not an external site.
The duplicate records are coming from multiple sites (I am capturing there IP address).
I am getting a duplicate about 3 or 4 times a day out of maybe 300 record inserts.
Any help would be greatly appreciated.
There are many sqlcmdInsert.Parameters("@item").Value =
cnTaxInTake.Open()
sqlcmdInsert.ExecuteNonQuery()
cnTaxInTake.Close()
And that is it.
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Jan 26, 2015
I ran this query to populate a field with random numbers but it keeps populating with some duplicate records. how I can remove the duplicates?
UPDATE APRFIL
SET ALTATH = CONVERT(int, RAND(CHECKSUM(NEWID())) * 10000);
Below are sample output that I need the dupes not show. The table already exist and its sql 2008
155957
155957
155968
155974
155976
15599
155990
155997
155997
156005
156008
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Jan 20, 2015
I want to group the following data attached by CUSTACCT, YEAR, PERIOD(month). As you can see in the attached example, I see duplicates for late fees and Exchange fees but none for FLIGHT_HRS. I want to see the data grouped by CUSTACCT by YEAR then by PERIOD for each of these: FLIGHTHRSSUM, LATEFEESUM, EXCHFEESUM without duplicates.
Is this possible?
This is my current SQL
SELECT dbo.VIEW_FLIGHT_HRS_TOT.YEAR AS FLTHRSYEAR, dbo.VIEW_FLIGHT_HRS_TOT.PERIOD AS FLTHRSPERIOD, dbo.VIEW_FLIGHT_HRS_TOT.FLIGHTHRSSUM,
dbo.VIEW_LATE_FEES_TOT.PERIOD AS LATEFEEPERIOD, dbo.VIEW_LATE_FEES_TOT.YEAR AS LATEFEEYEAR, dbo.VIEW_LATE_FEES_TOT.LATEFEESUM,
[Code] ....
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Oct 11, 2013
I have one table which contines 3 columns they are
1.emp
2.monthyear
3.amount
in that table i am having 6 rows like below.
emp monthyear amount
1 102013 1000
2 102013 1000
1 112013 1000
1 112013 1000
2 122013 1000
2 122013 0000
i want a total on group by condition on each employee. which will have the data from NOV to dec 2013 only.
out put should be like this
1 2000
2 1000
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May 28, 2015
We have an application that can spit out our Facility Structure into the following format. However, we have a need to take that data and feed it into another system. However, as you can see it is organized in a PARENT / CHILD structure.
Indent Level Key:
1System
2Facility
3Service Line
4Division
5Department
If you notice, each additional row is the child row to its parent above it as long as the Indent Level Key continues to increment. Once we start going back up the structure we essentially have a new Division/Service Line/or Facility depending on how far back we jump on the Indent Level for that next row. Here is some sample data.
--===== If the test table already exists, drop it
IF OBJECT_ID('TempDB..#Test_Data','U') IS NOT NULL
DROP TABLE #Test_Data
--===== Create the test table with
SET ANSI_NULLS ON
[Code] .....
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Jul 3, 2015
We have 4 servers : Server 1 , Server 2 and HA , DR servers.
I designed 2 Plans to get HA support for my databases .
Which of them are better , And is there any problem in my design ?
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Dec 14, 2014
I got this ERD and I have 2 questions about it:
What is the minimum number of times that R2 can appear in the connection? and what is the maximum?
A=5
B=5
C1=1
C2=2
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Oct 3, 2015
I have a function which generate random number in range :
CREATE FUNCTION Func_Rand
(
@MAX BIGINT ,
@UNIQID UNIQUEIDENTIFIER
)
RETURNS BIGINT
AS
BEGIN
RETURN (ABS(CHECKSUM(@UNIQID)) % @MAX)+1
END
GO
If you run this script you always get result between 1 and 4
SELECT dbo.Func_Rand(4, NEWID())
BUT, in this script sometimes have no result !!!!!!! why??
SELECT 'aa'
WHERE dbo.Func_Rand(4, NEWID()) IN ( 1, 2, 3, 4 )
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Oct 7, 2015
I have heard that high numbers of VLF's aren't good. It can impact performance and can delay recovery time, so I wanted to test that.
I created 2 DBs with 100MB datafile and 50MB logfile.
TestDB log file had 100MB autogrowth
TestDB2 log file had 1% growth.
I inserted 1048576 records, took the backup
Ran DBCC loginfo and
TestDB had 40 VLFs and
TestDB2 had 165 VLFs
But when I restored both DBs, this is what I got.
TestDB:
RESTORE DATABASE successfully processed 42258 pages in 4.420 seconds (74.691 MB/sec).
SQL Server Execution times:
CPU Time = 125ms, elapsed time = 8323 ms.
TestDB2:
RESTORE DATABASE successfully processed 42257 pages in 3.943 seconds (83.724 MB/sec).
SQL Server Execution Times:
CPU time = 109 ms, elapsed time = 8314 ms.
Question is: Where is the difference? How TestDB which has 40 VLFs are better than TestDB22 which has 165 VLFs.
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Aug 11, 2015
Table1 contains fields Groupid, UserName,Category, Dimension
Table2 contains fields Group, Name,Category, Dimension (Group and Name are not in Table1)
So basically I need to read the records in Table1 using Groupid and each time there is a Groupid then select records from Table2 where Table2.Category in (Select Catergory from Table1)
and Table2.Dimension in (Select Dimension from Table1)
In Table1 There might be 10 Groupid records all of which are different.
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Nov 10, 2014
Is there any way to trigger an event (ie. call a procedure/job/etc.) when/if an AG fails over?
Not looking to use agent alerts.
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Dec 24, 2014
Recently after turning on trace I restarted the sql services on a box which is configured for automatic failover availability groups. The ag has not failed over to other node. The other node was in resolving state. When the restarted server is back, the AG went back to that server. I checked the sys.availability groups field for failover property failure condition level, it's set to 1 which means service restarts should initiate the failover.
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Jun 17, 2015
What I asked for: Three Windows Server 2012 R2 machines with independent storage running a SQL Server 2014 AlwaysOn Availability Group. DB1 would be the primary, DB2 would be a synchronous replica, and DB3 would be a remote asynchronous replica.
What I was given: a two-node Windows Server 2012 R2 WSFC to run SQL Server 2014 Enterprise with shared storage and a third (remote) Windows Server 2012 R2 machine with independent storage, also with SQL Server 2014 Enterprise, to host an AlwaysOn Availability Groups asynchronous replica.
DB1 and DB2 (as Cluster1) share an E: drive. The remote DB3 has its own E: drive. Initially, DB3’s E: drive was claimed as a cluster resource and I couldn’t even see it. I’ve had several ugly days trying to make this work and have temporarily given up, installing DB3 as a standalone SQL Server that is no longer part of the WSFC and pointing everything towards that (it was originally a third node in the WSFC).
Is it possible to create an AlwaysOn Availability Group with nested clusters (i.e. create the AOAG with Cluster1 and DB3 and somehow ignore the individual nodes that comprise Cluster1)?
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Nov 25, 2013
create table #temp_Alpha_num (
[uniquenum] [int] Not NULL,
[Somenum] [int] Not NULL,
)
Insert into #temp_Alpha_num(uniquenum,Somenum)
values
(1,121)
[Code] ....
For the somenum column I need to add alphabets to make them unique. for example
121a,121b,121c....121z,121aa,121ab,101a and so on...
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Apr 7, 2015
I have this query
SELECT top 100 Ltrim([text]),objectid,total_rows,total_logical_reads , execution_count
FROM sys.dm_exec_query_stats AS a
CROSS APPLY sys.dm_exec_sql_text(a.sql_handle) AS b
where last_execution_time >= '2015-04-07 10:01:01.01'
ORDER BY execution_count DESC
But the result of execution count is from the first. I want to know it only one day.
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Jul 6, 2015
I have a CTE query against a table with 32K rows that runs fine in 2008R2. I am running it in 2014 Std Ed. against the same data and it runs very slowly. Looking at the execution plan I think I see what's contributing to the slowness.
Note that the "actual number of rows" is some 351M...how is this possible?
the query:
declare @amts table (claim int,allowed decimal(12,2),copay decimal(12,2),deductible decimal(12,2),coins decimal(12,2));
;with unpaid (claimID) as (select claimID from claim where amt+copay + disct+mm + ded=0)
insert @amts
select lineID, sum(rc), sum(copay), sum(deduct),
case when sum(mm)>0 and (sum(mm)<sum(mmamt)) then sum(mm) else 0 end
from claimln
where status is null
and lineID not in (select claimID from unpaid)
group by lineID
it's like there's some massively recursive process going on?
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Jul 15, 2015
I have four columns in my table, the first one is the identity column
col1 Col1 col2 col3
1 12 1 This is Test1
2 12 2 This is Test1
3 12 3 This is Test3
4 12 4 This is Test4
5 12 5 @@@@@
When, I see, @@@ sign in my col4, I need to restart the col3 from 1 again so it will look like this
col1 Col2 col3 col4
1 12 1 This is Test1
2 12 2 This is Test1
3 12 3 This is Test3
4 12 4 This is Test4
5 12 5 @@@@@
6 12 1 This is another test1
7 12 2 This is another Test2
Is it possible to do that?
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Jun 24, 2014
I have a family table and would like to group all related members under the same familyID. This is a replication of existing business data, 14,000 rows. The familyID can be randomly assigned to any group, its sole purpose is to group the names:
declare @tv table (member varchar(255), relatedTo varchar(255))
insert into @tv
select 'John', 'Mary'union all
select 'Mary', 'Jessica' union all
select 'Peter', 'Albert' union all
[Code] ....
I would like my result to look like this:
familyID Name
1 John
1 Mary
1 Jessica
1 Fred
2 Peter
2 Albert
2 Nancy
3 Abby
4 Joe
4 Frank
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Sep 15, 2014
I have a user, who is trying log into the server, but everytime he gets this error saying something about the Group policy denies him access.
This user needs access and i'm trying to understand how to grant it to him.
I have been looking into how i can access the group policy editor, but the farthest i can get is the Local group policy editor. How do i make sure this specific user has access?
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Nov 14, 2014
Where can I find dates and times to when an availability group was moved outside of the SQL error log?
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Jul 28, 2015
I need to select records in column that start with '% ' -- %space e.g. column A = % mytest
I tried select column name with like operator but it select records who start with % and ignore space
select columnA from table where columna like '% %';
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Jun 2, 2014
I am writing a performance baseline test.
The first test writes 5000000 rows in one table. I realise this is not representative OLTP behaviour, but it worked me to start interpreting performance counters and to test several setups to be discussed with our server, storage and network administrators. This way we have been able to compare the results of different hard disks, Lun vs vmdk, 1GB vs 10GB network, AMD vs Intel, etc. This way I can also compare several SQL setups (recovery model, max memory config, ...)
The screenshot shows the results of 2 runs on the same server : Win2012R2, SQL2014, 16GB RAM.
In test 1 min/max server memory was set to 9215MB/10751MB
In test 2 min/max server memory was set to 13311MB/14847MB
The script assures the number of bytes inserted in the nvarchar columns is always the same.
This explains why the number of pages and the number of MB in the table are the same at the end of the 2 tests (column 5 and 6)
Since ca 13GB has to be written, the results of test 1 show the lead time is increasing once more than 10GB has been inserted (column 8 and 9) In addition you can see at that moment
- buffer cache hit ratio is decreasing
- page life expectance becomes "terrible"
- free list stall/sec increases
- lazy writes/sec increases
- readlatency increases (write latency does not)
In test 2 (id 3 in column 1 in the screenshot) those counters are not really influenced (since the 5000000 rows can all be stored in memory).
Now what I do not understand is :
Why the number of pages read (instance level) as well as the number of bytes read and the number of reads (databaselevel) is increasing extremely during run 1.
I expected to see serious impact on write behavior, since SQL server is forced to start flushing dirty pages once memory is filled. Well actually you can see here the number of writes (not the the number of bytes written) starts to increase faster in test 1 after 4000000 rows, but there's no real impact on write latency.
Finally I want to notice
- I'm the only user on this machine
- the table has a clustered index on a identity column
- there are no foreign key constraints
- inserts are executed using a loop, not one big transaction
- to monitor progress and behaviour/impact, each 10.000 loops the counters are stored using dmv queries
So I wonder why SQL Server starts to execute so many reads in test 1.
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