T-SQL (SS2K8) :: Group By Performance FK / PK
Jul 10, 2014
We have a medium sized database with the next tables:
- PA: 525000 records
- PR: 780000 records
- R: 1000 records
- B: 45 records
PA: PK = PAARDCODE
PR: PK = PAARDREGISTERCODE
PR: FK = PAARDCODE
PR: FK = REGISTERCODE
R: PK = REGISTERCODE
R: FK = BOEKCODE
B: PK = BOEKCODE
When I group by B.BOEKCODE the query lasts: 10 (or more when 'where' option is added) seconds
When I group by R.BOEKCODE the query lasts less than 2 seconds.
SELECT B.BOEKOMSCHRIJVING, B.BOEKCODE -- or R.BOEKCODE
FROM PA
INNER JOIN PR ON PA.PAARDCODE = PR.PAARDCODE
INNER JOIN R ON R.REGISTERCODE = PR.REGISTERCODE
INNER JOIN B ON R.BOEKCODE = B.BOEKCODE
GROUP BY BOEKOMSCHRIJVING, B.BOEKCODE -- or R.BOEKCODE
ORDER BY BOEKOMSCHRIJVING Why is the option of B.BOEKCODE a lot slower compared to R.BOEKCODE?
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Jun 12, 2015
Table Clients is master table with all records, joining against Assets table that may or may not have a matching entry.
Trying to sum an asset type against table and no matter what kind of join I do I cannot get SQL to return a NULL match against the Clients ID value. All I get back are matching rows.
Here's the SQL:
select c.cindex,SUM(a.value) AS 'Total Assets' from Clients c
"the join" Assets2012 a on a.clientid=c.cindex
where (c.ClientClass<=7 AND c.ClientClass<>6) AND a.assettype = 2
group by c.cindex
But no matter what type of join I do, left, right, left outer, inner, I am not getting back NULL values for client records that have no matching asset records.
Strange thing is, by removing the "and assettype=2" part I get the whole database back, with NULL's but not the range I'm looking for.
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Jul 22, 2015
I want to select all the Rows with Grouping done by PARENTID and Max value in REVNR per GROUP.
I am able to get one MAX row per Group but not all the Rows which has MAX value.
Here is my Table sample.
CREATE TABLE #TableA0 (
iINDEX INT
,PARENTID INT
,DOCUMENTID INT
,QTY INT
[code]....
In the result how do i get just 2 ParentIDs but multiple rows of DocumentID.
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Oct 17, 2014
I had a pretty simple query like
select * from table_A
where email in (select email from table_B)
or
email not in (select email from table_c)
It ran for a very long time.
But if I ran the select with either of the conditions by itself it took just a second. Combining both conditions really slowed it down.
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Apr 1, 2014
I have a table with the following columns
Num,ID,Pos,Value
74 ,1,2,beck
74 ,1,2,greg
74 ,1,9,mike
74 ,1,9,laggo
74 ,2,2,beck
74 ,2,2,greg
74 ,2,9,mike
74 ,2,9,laggo
I am trying to get the result as follows.
Num Id Final Value
74 1 2,beck,greg;9,mike,laggo
74 2 2,beck,greg;9,mike,laggo
I tried to use Stuff and XMLpath but it is not giving me distinct results.
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Jan 13, 2015
How to get the lowest U.Price along with FX and Rate.
ID-U.Price-FX-Rate
1280 19.1196 EUR 3.85
1280 46.2462 USD 3.63
1280 6.32 RM 1.00
Required output.
ID-U.Price-FX-Rate
1280 6.32 RM 1.00
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Jan 21, 2015
How can we write the query using groupby. I need to have group by only one column. Is it possible through subquery?
select col1, col2, col3
from testtable
group by col1.
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May 18, 2015
I have a table with a text field and a grouping number.
1, A
1, B
1, C
1, D
1, E
2, A
2, C
2, D
2, E
3, A
3, B
3, C
3, F
4, A
4, B
4, D
4, F
4, G
I assemble the text fields into strings by group, using the FOR XML PATH('') function, so that I end up with
1, A-B-C-D-E
2, A-C-D-E
3, A-B-C-F
4, A-B-D-F-G
This all works fine. I now have a requirement to leave out some groups, based on whether the GROUP does or does not contain a certain text. For instance, if I want only GROUPS with 'E', my result set should be
1, A-B-C-D-E
2, A-C-D-E
If I want only those GROUPS that DO NOT have 'E', my result set should be
3, A-B-C-F
4, A-B-D-F-G
I can (and have) put a condition on the assembled string, but it seems to me that it should be possible to make the cut earlier. That is, rather than assembling the string, scanning it with a Like '%E%' condition and discarding what doesn't meet my needs, I would like to stop scanning the incoming GROUP as soon as a mismatch is detected.
If I want all groups that will not contain an 'A', for instance, it is pointless for the query engine to read in 'A', 'B', 'C', 'D', 'E', put them all together into a string, compare it with a wildcard and throw it away. As soon as it sees the 'A', it has enough information to completely skip over the rest of that group. The abbreviated examples here are trivial, but the real code is not.
All I've been able to dream up so far results in skipping the RECORD that contains the 'A', but not the entire group.
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Aug 3, 2015
I would like to display all the products with maximum SeqNo from the table below:
TABLE
ProductIDSeqNoBalance
111215
11135
111420
111510
12115
1212100
121325
121445
OUTPUT
ProductIDSeqNoBalance
111510
121445
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Jun 25, 2014
I have a pretty complex query that returns three records. For simplicity sake, the results can be simulated with this query:
Select 5 AS InternalAuditTeamEmployeeID, 1 as InternalAuditTeamID
UNION ALL
Select 11, 2
UNION ALL
Select 14, 3;
I want to take this result and update the Flag field to true in my table tblInternalAuditTeamEmployee (CREATE statement below) for any InternalAuditTeamEmployeeID that is less than or equal to the ones in the results above, but by group. My results would look something like this using the data below and the results above.
InternalAuditTeamEmployeeIDInternalAuditTeamIDEmployeeIDFlag
1 1 619 1
218581
316041
425181
517161
639661
711910
819400
92391
1012340
1129541
1228910
1329500
143321
1539450
I was thinking I could somehow use ROW_NUMBER(PARTITION BY InternalAuditTeamID ORDER BY InternalAuditTeamEmployeeID DESC), but not sure how to get the results of "WHERE <= InternalAuditTeamEmployeeID For each particular group".
CREATE TABLE STATEMENT:
CREATE TABLE [tblInternalAuditTeamEmployee](
[InternalAuditTeamEmployeeID] [int] IDENTITY(1,1) NOT NULL,
[InternalAuditTeamID] [int] NOT NULL,
[EmployeeID] [int] NOT NULL,
[Code] ......
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Jul 7, 2014
I am having below schema.
CREATE TABLE #Turnover (
location varchar(50),
Total int
)
insert into #Turnover (location,Total) values('A', 500)
insert into #Turnover (location,Total) values('AB', 200)
insert into #Turnover (location,Total) values('ABC', 100)
insert into #Turnover (location,Total) values('BA', 100)
insert into #Turnover (location,Total) values('BAC', 500)
insert into #Turnover (location,Total) values('BAM', 100)
Now i want output order by total but same time i want to create two groups. i.e. location starting with A and order by total and after locations starting with B and order by total.
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Dec 10, 2014
This my table named myData
CREATE TABLE [dbo].[myData](
[idx] [int] NULL,
[paymentMethod] [nvarchar](200) NULL,
[daerahKutipan] [int] NULL,
[payer] [int] NULL,
[code]....
I want to calculate the number of payer Group By paymentMethod. The number of payer must be divided by daerahKutipan. So far, my query as follow
select paymentMethod,
COUNT(CASE WHEN daerahKutipan = 1 THEN payer ELSE 0 END) figure_Seremban,
COUNT(CASE WHEN daerahKutipan = 3 THEN payer ELSE 0 END) figure_KualaPilah,
COUNT(CASE WHEN daerahKutipan = 4 THEN payer ELSE 0 END) figure_PortDickson,
COUNT(CASE WHEN daerahKutipan = 5 THEN payer ELSE 0 END) figure_Jelebu,
COUNT(CASE WHEN daerahKutipan = 6 THEN payer ELSE 0 END) figure_Tampin,
COUNT(CASE WHEN daerahKutipan = 7 THEN payer ELSE 0 END) figure_Rembau,
[code]....
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Jul 3, 2015
I've got a fairly standard query that does a group by a type column, and then sums the lengths of a VARCHAR column. I'd like to add into that a concatenated version of the string always concatenating in primary key order. Is that possible?
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Mar 31, 2008
hi,
Im not very familiar in tuning the performance of a sql.I want to join three tables
Grant Ledger ,Grant fund and payment table.
Grant ledger has grant_id,fund etc.,
Grant fund has grant_id,fund,proj start and end dates
Payment has grant code(FK of grant id),payment type and some other columns..
Can anyone suggest me how to join all these three tables with a group by having all of the above mentioned columns.
Normal join with group by takes extremely long ...like minutes to execute..
Should we group it immediately after we join or can we group them altogether at the end with all the column names in select statement.
Thanks.
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Mar 11, 2014
Given the following example;
declare @CustIfno table (AccountNumber int, StoreID int, Distance decimal(14,10))
insert into @CustIfno values ('1','44','2.145223'),('1','45','4.567834'),
('1','46','8.4325654'),('2','44','7.8754345'),('2','45','1.54654323'),
('2','46','11.5436543'), ('3','44','9.145223'),('3','45','8.567834'),
('3','46','17.4325654'),('4','44','7.8754345'),('4','45','1.54654323'),
('4','46','11.5436543')
How can I show the shortest Distance by AccountID and StoreID. Results would look like this;
AccountNumberStoreID Distance
1 44 2.1452230000
2 45 1.5465432300
3 45 8.5678340000
4 45 1.5465432300
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Jul 17, 2014
Is it possible to check for Active Directory group.. ie see if the user running the Stored Proc, is in a specific Active Directory Group? Or if I set up Login's using Active Directory, can I get the Login that way... or will it give me the user's account?
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Aug 1, 2014
I'm trying using the GROUP BY CUBE aggregation. Currently I have this working as such:
SELECT
ISNULL(CONVERT(VARCHAR,Date), 'Grand Total') Date
,ISNULL([1 Attempt],0) [1 Attempt]
,ISNULL([2 Attempts],0) AS [2 Attempts]
,ISNULL([3 Attempts],0) AS [3 Attempts]
,ISNULL([4 Or More],0) AS [4 Or More]
[Code] .....
Basically this is used to work similar to a Pivot table in excel. My data will look as follows:
Date 1 Attempt2 Attempts3 Attempts4 Or MoreTotal
2012-09-04 239 68 2 8 317
The problem I'm having is the Total column. Although this is summing the line values correctly, the total should be based on the sum not count of attempts i.e. 1 x 239, 2 x 68, 3 x 2, 4 x 8
If I change the FROM select clause to use SUM instead of COUNT
SELECT
CONVERT(DATE,[Date]) Date
,ISNULL(AttemptsFlag,'Total') as Attempt
,SUM(NoOfTimes) AS Totals
FROM
XXXXX
GROUP BY
CUBE([Date],AttemptsFlag)
It will return the correct Total amount but not the right numbers for the Attempt groupings...
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Mar 30, 2015
We sell & ship packages that contain multiple items within them. The actual package (we call it the "parent item") is in the same table as the items within it ("child items"). If the record is a child item within a package, its "ParentId" field will contain the ItemId of the package.
So some sample records of a complete package would look like this:
ItemId | ParentId | Name | QtyAvailable
----------------------------------------
1 | NULL | Package A | 10
2 | 1 | Item 1 | 2
3 | 1 | Item 2 | 3
ItemId's 2 & 3 are items contained within the ItemId 1 package.
Now however, the client wants us to build a report showing all packages (all items where ParentId is NULL) however, they want to see the QtyAvailable of not only the package but the items as well (a total of 15 when using the example above), all grouped into a single line. So a sample report line would look like this:
Name | Available Qty
--------------------------
Package A | 15
Package B | 100
How can I do a SELECT statement that SUMS the "QtyAvailable" of both the parent & child items and displays them along with the package name?
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Jun 15, 2007
I have recently started working with a new group of people and I find myself doing a lot of reporting. While doing this reporting I have been writing a TON of sql. Some of my queries were not performing up to par and another developer in the shop recommended that I stay away from the "GROUP BY" clause.
Backing away from the "GROUP BY" clause and using "INNER SELECTS" instead as been more effective and some queries have gone from over 1 minute to less that 1 second.
Obviously if it works then it works and there is no arguing that point. My question to the forum is more about gather some opinions so that I can build an opinion of my own.
If I cannot do a reasonable query of a couple of million records using a group by clause what is the problem and what is the best fix?
Is the best fix to remove the "GROUP BY" and write a query that is a little more complex or should I be looking at tuning the database with more indexes and statistics?
I want to make sure that this one point is crystal clear. I am not against following the advice of my coworker and avoiding the "GROUP BY" clause. I am only intersted in listening to a few others talk about why the agree or disagree with my coworked so that I can gain a broader understanding.
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Mar 30, 2015
In Outer join, I would like to add the outer columns that don't exist in the right table for each order number. So currently the columns that don't exist in the right table only appear once for the entire set. How can I go about adding PCity, PState to each order group, so that PCity and PState would be added as null rows to each group of orders?
if OBJECT_ID('tempdb..#left_table') is not null
drop table #left_table;
if OBJECT_ID('tempdb..#right_table') is not null
drop table #right_table;
create table #left_table
[Code]....
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Jun 8, 2012
For code reuse, I am trying to get a table valued function to return users of a given AD group name. I can easily get this with hard-coding the group name. But because OpenQuery wont accept parameters, I can't insert my group name there. And because functions can't call dynamic SQL, I can't do it via dynamic sql. I have seen people do it with CLR, but I rather not go that route. I can use a stored procedure + cursor and iterate through each group and store the results into real tables and create a cache, but I rather query Active Directory itself to save space, but I rather do the caching then the CLR. Any approach I am missing on how to do this?
The following works fine:
SELECT DISTINCT sAMAccountName
FROM OPENQUERY(ADSI, 'SELECT sAMAccountName, sn
FROM ''LDAP://OU=SomeOU,OU=SomeOtherOU,DC=SomeDC,DC=SomeOtherDC''
WHERE objectCategory=''Person'' AND objectClass=''USER'' AND memberOf=''CN=SomeGroupName,OU=SomeOU,OU=SomeOtherOU,DC=SomeDC,DC=SomeOtherDC''') a
WHERE sn IS NOT NULL
The following gives me the error:
Invalid use of a side-effecting operator 'EXECUTE STRING' within a function.
CREATE FUNCTION [dbo].queryADGroupMembers
(
@group nvarchar(255)
)
RETURNS @rtnTable TABLE
[Code] .....
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Jun 18, 2014
How to identify different fields with in a group of records?
Example:
create table #test
(ID int, Text varchar(10))
insert into #test
select 1, 'ab'
union all
select 1, 'ab'
[Code] ...
I want to show additional field as Matched as ID 1 has same Text field on both the records, and for the ID 2 I want to show Unmatched as the Text fields are different but with the same ID.
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Aug 27, 2014
I'd like to first figure out the count of how many rows are not the Current Edition have the following:
Second I'd like to be able to select the primary key of all the rows involved
Third I'd like to select all the primary keys of just the rows not in the current edition
Not really sure how to describe this without making a dataset
CREATE TABLE [Project].[TestTable1](
[TestTable1_pk] [int] IDENTITY(1,1) NOT NULL,
[Source_ID] [int] NOT NULL,
[Edition_fk] [int] NOT NULL,
[Key1_fk] [int] NOT NULL,
[Key2_fk] [int] NOT NULL,
[Code] .....
Group by fails me because I only want the groups where the Edition_fk don't match...
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Jun 12, 2014
SQL Server 2008 r2...
I have a query which does 3 selects and Union ALLs each to get a final result set. The performance is unacceptable - takes around a minute to run. If I remove the Union All so that the result sets are returned individually it returns all 3 from the query in around 6 seconds (acceptable performance).
Any way to join the result sets together without using Union All.
Each result set has exactly the same structure returned...
Query below [for reference]...
WITH cte AS (
SELECT A.[PoleID], ISNULL(B.[IsSpanClear], 0) AS [IsSpanClear], B.[SurveyDate], ROW_NUMBER() OVER (PARTITION BY A.[PoleID] ORDER BY B.[SurveyDate] DESC) rownum
FROM[UT_Pole] A
LEFT OUTER JOIN [UT_Surveyed_Pole] B ON A.[PoleID] = B.[PoleID]
[Code] .....
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Sep 29, 2015
I have an SSRS 2012 table report with groups; each group is broken ie. one group for one page, and there are multiple groups in multiple pages.
'GroupName' column has multiple values - X,Y,Z,......
I need to group 'GroupName' with X,Y,Z,..... ie value X in page 1,value Y in page 2, value Z in page 3...
Now, I need to display another column (ABC) in this table report (outside the group column 'GroupName'); this outside column itself is another column header (not a group header) in the table (report) and it derives its name partly from the 'GroupName' values:
Example:
Value X for GroupName in page 1 will mean, in page 1, column Name of ABC column must be ABC-X Value Y for GroupName in page 2 will mean, in page 2, column Name of ABC column must be ABC-Y Value Z for GroupName in page 3 will mean, in page 3, column Name of
ABC column must be ABC-Z
ie the column name of ABC (Clm ABC) must be dynamic as per the GroupName values (X,Y,Z....)
Page1:
GroupName Clm ABC-X
X
Page2:
GroupName Clm ABC-Y
Y
Page3:
GroupName Clm ABC-Z
Z
I have been able to use First(ReportItems!GroupName.Value) in the Page Header to get GroupNames displayed in each page; I get X in page 1, Y in page 2, Z in page 3.....
However, when I use ReportItems (that refers to a group name) in the Report Body outside the group,
I get the following error:
Report item expressions can only refer to other report items within the same grouping scope or a containing grouping scope
I need to get the X, Y, Z ... in each page for the column ABC.
I have been able to use this - First(Fields!GroupName.Value); however, I get ABC-X, ABC-X, ABC-X in each of the pages for the ABC column, instead of ABC-X in page 1, ABC-Y in page 2, ABC-Z in page 3, ...
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Nov 27, 2007
Hi!
I've posted a feedback with Microsoft to see if we can get them to fix the issue described below, but so far no one from Microsoft has commented to let us know what they're doing about this problem! I'm posting this here to see if maybe we can get more people to rate this feedback or chime in on what a pain it is! Please feel free to add your own comments or how you had to work around this issue and whether or not you think this is something Microsoft should be addressing NOW.
https://connect.microsoft.com/SQLServer/feedback/ViewFeedback.aspx?FeedbackID=311679
Provide Individual Page Numbering per Group and Total Pages per Group
Currently in a Reporting Services report, you can't readily reset the page number for each group in a table, nor can you display the total number of pages per group. For example, if I'm printing invoices and each invoice is a separate group, I'd like to be able to print "Page 1 of 5" , "Page 2 of 5" etc. for the first invoice, then "Page 1 of 3" when the next invoice begins, and so on. This was easy in Crystal Reports. I realize that Crystal Reports has a two-pass process that enables that kind of pagination. However, this is REALLY important functionality that's just missing from Reporting Services and I'm hoping you'll provide it REALLY SOON! Yeah, I know there are work-arounds if you can know exactly how many rows of information there are on each page. But gosh! That's not practical, especially if you have second level groups inside the main group or text blocks in rows that can 'grow' to more than one line. I've read a couple of work-arounds, but none of them works correctly and consistently when more than one user is running the same report or when you print the report while you're looking at it on the screen. I still may need access to the overall report page number and the overall total number of pages, so don't get rid of that. It's just that if you're doing this already for the entire report, I don't see why you can't do it per group! Lots of people have been asking for this for years, and I don't understand why it hasn't been implemented.
I've read a few articles on this topic, but no one has come up with a decent work around. My theory is that Microsoft should be addressing this immediately. This is major functionality that's just plain missing from SSRS and should have been there from the start. If anyone from Microsoft can let us know what's going on with this issue or if anyone would like for me to clarify this further, feel free to let me know.
Thanks!
Karen
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Nov 6, 2015
I have an SSRS report with groups that when exported to excel contains drill-in's (plus marks on left side). The issue I have is that for all the groups in the drill-in, those cells become merged. I want to keep the group drill-in but have the cells UNMERGED. I have heard this can be done with the RDL XML but I don't know what to modify to accomplish this.
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Jan 10, 2014
I'd like to ask how you would get the OUTPUT below from the TABLE below:
TABLE:
id category
1 A
2 C
3 A
4 A
5 B
6 C
7 B
OUTPUT:
category count id's
A 3 1,3,4
B 2 5,7
C 2 2,6
The code would go something like:
Select category, count(*), .... as id's
from TABLE
group by category
I just need to find that .... part.
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Sep 12, 2004
1. Use mssql server agent service to take the schedule
2. Use a .NET windows service with timers to call SqlClientConnection
above, which way would be faster and get a better performance?
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Sep 25, 2003
I have a user in SQL Server with a NT login of Mike
I changed his NT account to Mikel in User Manager
Now when I try to add Mikel, Im getting error 15401.
Do I need to delete NT login in SQL Server 'Mike' account first ?..before adding 'Mikel' ?
Can I go into the Master database and just change Mike login to Mikel ?
Thank you
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Feb 28, 2014
I'm having a fight with Reporting Services at the minute when trying to compute an average at the row group level for a value summed in a column group.I have the following column groups:
Year
Month
Date
And the following row groups:
Region
Product
SubType (hidden, data at the date level is summed to Product)
At the moment I'm computing the average for SubType for each Date at the Product level (giving a decimal value), so for each day I end up with a nice average, that works. However I am unable to average that average over the whole Year for a Product. The issue being that I'm trying to combine Row Groups (Product) and Column Groups (Date/Year)
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May 1, 2014
select top 15 count(*) as cnt, state from table
group by state
order by cnt desc
[code[...
Can the above three queries be combined into one and still be fast, if so how?What i am trying to go is an item count, by group, similar to ones Inbox in Outlook.
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Nov 21, 2007
I have a need to show a row inside a table group to simulate a header row for the data rows inside the group. The table will not have a real header or footer. Thanks for the help.
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