Query Performance With Order By Clause?
Jul 20, 2005
Hi all,
Just wondering if anyone can tell me if an order by clause on a select
query would have any impact on the time it takes to retrieve results?
Essentially I'm selecting Top 1 out of a table via various criteria
and currently getting it back without an order by clause. The order by
would only include the column that has the clustered primary index on
it.
Can anyone tell me if in theory this will slow the query down?
Many thanks in advance!
Much warmth,
Murrau
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Jul 20, 2005
HiI want a simple select query on a column-name (smalldatetime) withvalues dislayed in desc order with null values FIRST.i.e.Select orderdate from ordersorder by ( null values first and then orderdate in desc order)could any one please helpThanks
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Feb 25, 2008
Table:ColumnsUsersList:UserID, UserName, Country
I need a query which select all the rows from the above mentioned table with all fieldsButThe order the rows is First all the users from "Pakistan"Second all the users from rest of the countries except "Pakistan" in ascending order
So the query first return all the users from Pakistan and the the users from rest of the world in ascending order.
Forexample,
1, ABC, USA2, XYZ, Saudi Arabia3, LMN, Pakistan4, TQR, India5, PTR, Afghanistan
then the query returns.
3, LMN, Pakistan5, PTR, Afghanistan4, TQR, India2, XYZ, Saudi Arabia1, ABC, USA
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May 7, 2012
I could write a query with a sub-query in order to perform an UPDATE on the most recent 60,000 records of a table based on a date field, but unfortunately I am receiving an error.
Code:
SELECT * FROM DMTM
SET transmit_date = '2012-05-07 00:00:00.000', transmit_status = '1223'
WHERE temp_pk in
[code]...
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Sep 1, 2012
In my BM_Maps subform, there is a combo box called called Borders. I want the borders to be filtered based on product series, so if the user picks "City Guide", they only get city guide borders, so I have added a table called Product_Series_X_Border which has the product series and border id.
I have a query which joins two tables, and I've ordered it by the border name, which works fine, until I add a where clause for the product series from the other table. I have attached a screengrab which I hope works. I have tried joining other tables but it still doesn't work. Is there any other way I can order by border name with the where clause? I've tested with individual product series as the where clause with the same result.
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Aug 19, 2006
Hi,
on executing the below query i am getting the following error
ERROR: Errors in the back-end database access module. Nested table keys in a SHAPE query must be sorted in the same order as the parent table. The nested query may be missing an ORDER BY clause.
even though the order by clause is presenet in the nested query
SELECT t.[ProductId], Predict ([Association].[Product Basket],3)
From
[Association]
PREDICTION JOIN
SHAPE {
OPENQUERY([Adventure Works Cycle MSCRM],
'SELECT DISTINCT [ProductId] FROM (SELECT ProductId FROM ProductBase) as [Product] ORDER BY [ProductId]')}
APPEND
({OPENQUERY([Adventure Works Cycle MSCRM],
'SELECT [ProductId] FROM (SELECT ProductId FROM ProductBase) as [Product] ORDER BY [ProductId]')}
RELATE [ProductId] To [ProductId]
)
AS
[Product] AS t
ON
[Association].[Product Id] = t.[ProductId] AND
[Association].[Product Basket].[Product Id] = t.[Product].[ProductId]
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Dec 5, 2006
Hi There !!
To finetune performance for some of our queries,
I have come across suggestions to use
- JOINS instead of WHERE clause wherever possible
- and avoid using Aliases
Although Avoiding aliases looks reasonable I am yet to be convinced about JOINS replacing the WHERE CLAUSE . What is the experts take on this one ????
Also,
I checked the estimated plan in SQL server by running the following 2 queries into my Query Designer
tables : dba ( empid, empname )
project ( project_empid references dba.empid, project_name )
USING A WHERE CLAUSE and Alias
-------------------------
select a.emp_name from dbo.dba a, dbo.project b
where
a.empid =b.project_emp
and b.project_name is not null
USING A JOIN
-----------------
select emp_name from dbo.dba
as
a inner JOIN dbo.project
ON empid = dbo.project.project_emp
AND dbo.project.project_name is not NULL
******
I find from the Estimated plan that both the queries give the same amount of cost ( I/O, CPU, et all ) :shocked:
Any comments/ suggestions.
Thanks,
Have a great time
-Ranjit.
-------------------------------------
It pays to be honest to your DBA
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Mar 22, 2008
Hi,
I wonder if its possible to perform a ORDER BY clause in an SELECT DISTINCT sql query whereby the AS SINGLECOLUMN is used. At present I am recieving error: ORDER BY items must appear in the select list if SELECT DISTINCT is specified. My guess is that I cant perform the Order By clauses because it cant find the columns individually. It is essentail I get this to work somehow...
Can anyone help? Thanks in advance
Gemma
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May 5, 2015
I am querying a tableA with 1.8 million rows, it has id as its primary key and is a clustered index. I need to select all rows where I order by lastname. Its taking me 45 seconds. Is there anything i can do to optimize the query.Will creating a fulltext index on lastname If so, can you give me an example on how to create a full text index on lastname?
[Project1].[Id] AS [Id],
[Project1].[DirectoryId] AS [DirectoryId],
[Project1].[SPI] AS [SPI],
[Project1].[FirstName] AS [FirstName],
[Project1].[LastName] AS [LastName],
[Project1].[NPI] AS [NPI],
[Project1].[AddressLine1] AS [AddressLine1],
[Project1].[AddressLine2] AS [AddressLine2],
[code]...
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Jul 27, 2015
For example in a Select Statement we have many tables and we have Where Clause with many conditions with AND operations. Do the SQL SERVER would apply the Where clause after all fetch or can dynamically decide about to include the related Tables from Select Statement Orderly with respect to where clause predicates? (SQL SERVER would not fetch data of those tables for its Select, where the AND condition in Where clause fails or by logic would be fruitless/not-related.)
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May 18, 2006
I have created view by jaoining two table and have order by clause.
The sql generated is as follows
SELECT TOP (100) PERCENT dbo.UWYearDetail.*, dbo.UWYearGroup.*
FROM dbo.UWYearDetail INNER JOIN
dbo.UWYearGroup ON dbo.UWYearDetail.UWYearGroupId = dbo.UWYearGroup.UWYearGroupId
ORDER BY dbo.UWYearDetail.PlanVersionId, dbo.UWYearGroup.UWFinancialPlanSegmentId, dbo.UWYearGroup.UWYear, dbo.UWYearGroup.MandDFlag,
dbo.UWYearGroup.EarningsMethod, dbo.UWYearGroup.EffectiveMonth
If I run sql the results are displayed in proper order but the view only order by first item in order by clause.
Has somebody experience same thing? How to fix this issue?
Thanks,
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Mar 19, 2007
I am getting the resultset sorted differently if I use a column number in the ORDER BY clause instead of a column name.
Product: Microsoft SQL Server Express Edition
Version: 9.00.1399.06
Server Collation: SQL_Latin1_General_CP1_CI_AS
for example,
create table test_sort
( description varchar(75) );
insert into test_sort values('Non-A');
insert into test_sort values('Non-O');
insert into test_sort values('Noni');
insert into test_sort values('Nons');
then execute the following selects:
select
*
from
test_sort
order by
cast( 1 as nvarchar(75));
select
*
from
test_sort
order by
cast( description as nvarchar(75));
Resultset1
----------
Non-A
Non-O
Noni
Nons
Resultset2
----------
Non-A
Noni
Non-O
Nons
Any ideas?
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Apr 30, 2001
I am looking to get a cyclic order in the order by clause. how do I do this?
for example I have 5 customers with ids like
xyz 1
xyz 2
xyz 3
xyz 4
xyz 5
when I am selecting xyz 3 I want the list to show
xyz 4
xyz 5
xyz 1
xyz 2
xyz 3
How do I do this by using the order by clause?
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Sep 5, 2007
Hello,
can any one tell me about the difference between the following queries.
1. SELECT * FROM Symp_User ORDER BY
2. SELECT * FROM Symp_User ORDER BY ASC
I don't think there is any difference in the above queries. kinldy make me clear on this.
thnkx,
rahul jha
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Aug 19, 2006
Can you explain the below scenario
The ORDER BY clause can include items that do not appear in the select list. However, if SELECT DISTINCT is specified, or if the statement contains a GROUP BY clause, or if the SELECT statement contains a UNION operator, the sort columns must appear in the select list.
what is the reason behind this.
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Jul 20, 2005
If I use the order by clause to sort on a date, where the date andtime stamp are the exact same for multiple records, how does SQLoutput the data?At random... or does it look at the primary key?
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Aug 7, 2007
Hello,Ive got a column which stores integers ranging from 0-200. I need to order them so that 1 is first, and 0 is last like 1,2,2,3,4,6,8....98....0,0,0My Order By clause statement looks like 'ORDER BY column_name', but obviously this will put the '0' records at the top. Is there a way around this?Thanks, Curt.
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Aug 29, 2007
The following SELECT query gives me a list of 50 plus countries. How do I order them by 'United States' First (happens to be ID 225) and then alphabetical?
SELECT Country_ID, Country_Long FROM Countries WHERE isIndustrial = 1 ORDER BY Country_Long
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Mar 19, 2008
Hi! I think the order by clause is driving me crazy.The following T-SQL query works: SELECT
count(*) AS c
From F_POST
Where id=@id
Order by c Ok, so far so good, but in the following case it is NOT possible to order the result set according to "count(*)": Select
T_Date AS TDATE,
count(*) AS c
From F_Post
Where id=@id
Order By case when @OrderBy = 1 then c
elseT_DATE DESC This is just strange since it is essentially the same query!? Furthermore, it seems to be inpossible to have a order-by-clause that looks like: Order By case when @OrderBy = 1 then T_Column1 ASC
elseT_Column2 DESC
Does anyone know how I can implement querys that do (almost) exactly this what the last 2 querys "should" to do?
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Dec 1, 2005
like so often my Forums database design (in its simplest form) is:Forums -ForumID -Title -CategoryForumsMsgs -fmID -DateIn -AuthorID -MessageI need to create a sql query which returns all forum titles along with some data for 1) the first message entry (date created and author) and 2) the last one. So how can I do a JOIN query which joins with a ORDER BY clause so that the top/bottom entry only is joined from the messages table?
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Mar 23, 2006
When I say to sort on a datetime field on descending order, the date is sorted. However, the time difference is not reflected in the results.
Any way, we can fix it.
i.e. If I have two records with the same dates but different times, the sorting order is not considering the time.
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Jun 26, 2000
I'm using a Case statement to change an Order By clause on the fly, eg
ORDER BY case when @SortBy = 1 then s.ITEM_NAME
when @SortBy = 2 then s.ITEM_ID
when @SortBy = 3 then s.ITEM_SIZE
end
The numeric columns work fine but when @SortBy = 1, I get the following message when I try to run the sp:
Server: Msg 8114, Level 16, State 5, Procedure usp_CML_SAO_RptPresLvl, Line 95
Error converting data type varchar to numeric.
ITEM_NAME is a varchar(40) containing alphanumeric characters; ITEM_ID is a numeric(8,0) & ITEM_SIZE is a varchar(5) containing numeric characters.
Is there some rule preventing me to dynamically change the Order By if using a alphanumeric characters?
Thanks for any help you can offer
Jo
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Mar 10, 1999
I am trying to pass as an input parameter a user selected order by clause, and instead of repeating the SQL statement with a new Order By based on the parameter, I want to set the Order by using this parameter. I can't get it to work.
Here is the statement:
Create Procedure sp_InfoDump
(
@StartDate varchar(12),
@EndDate varchar(12),
@OrderBy varchar(50)
)
As
/* Local variables */
DECLARE @MinDate datetime, @MaxDate datetime
IF @StartDate = 'ALL DATES'
BEGIN
SELECT @MinDate = Min(AccessTime)
FROM tblAudit
END
ELSE
BEGIN
SELECT @MinDate = @StartDate
END
IF @EndDate = 'ALL DATES'
BEGIN
SELECT @MaxDate = Max(AccessTime)
FROM tblAudit
END
ELSE
BEGIN
SELECT @MaxDate = @StartDate
END
BEGIN
SELECT tblReports.ReportName, tblReports.ReportCode,
tblAudit.BadAttempts, tblAudit.LogonUser, tblAudit.AccessTime,
tblAudit.RemoteHost, tblAudit.RemoteIdent, tblAudit.ExitTime,
tblAudit.BrowserType, tblAudit.Access_ID, TotalTime=DateDiff(Minute,tblAudit.AccessTime,tblA udit.ExitTime)
FROM tblReports
INNER JOIN
tblReportsAccess ON
tblReports.Report_ID = tblReportsAccess.Report_ID
INNER JOIN
tblAudit ON
tblReportsAccess.Audit_ID = tblAudit.Audit_ID
WHERE tblAudit.AccessTime >= @MinDate AND tblAudit.AccessTime <= @MaxDate
ORDER BY (SELECT 'ColumnName'=ColumnName FROM tblOrderBy WHERE ColumnName = @OrderBy)
END
RETURN
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Feb 17, 2005
I have a query that returns several ordered rows where one of the fields in the ORDER BY clause is a date field (DueDate) that we use to see the most pressing deadline first. The problem is that the default value in that field (which other code translates to mean no due date) is 1/1/1900. That means that items with no due date show up before today's import deadline. I can see one potential solution where I join my results on the original table where DueDate>1/1/1900 and then back to my results so I can use an ISNULL() on the field to set a value in the future (like 1/1/9999), but that seems like a really nasty wrong round-about way to do it. I think there has to be something better.
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May 21, 2014
I have a a grid (Fig-1) where i have LineID and corresponding RankValue. I want to sort out the Grid like (Fig-2) where It will be sorted based on Rank Value(Higher to lower) but LineID group should maintain. I am using SqlServer 2008.
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Mar 29, 2004
Need to pass column to ORDER BY as parameter in sp (possible 8 columns out of total 30). Is there a way to do it avoiding dynamic SQL use(will be used frequently)?
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Dec 7, 2007
Hi,
I'm currently have a problem with a query using a top clause. When I run it by itself as a single query, I have no problems and the results are valid. However, if I try duplicate the query after a union clause, the order by ... desc doesn't order properly.
The following is the query I'm using along with the results. Then I'll have the query I was trying to unite and the results (date ranges selected were the same in both):
QUERY 1
select top 1 (s.ldate), v.mdtid, po.odometer, pi.odometer, (pi.odometer-po.odometer) as 'Total Miles'
from EventStrings ES
JOIN schedules s
ON ES.SchId=S.SchId
JOIN vehicles v
ON v.vehicleid=es.vehicleid
JOIN Events PO
ON PO.schid=es.schid
AND PO.EvStrId=ES.EvStrId
AND po.activity=4
JOIN Events PI
ON PI.schid=es.schid
AND PI.EvStrId=ES.EvStrId
AND pi.activity=3
WHERE es.providerid in (0,1,4)
and s.ldate>=?
and s.ldate<=?
and v.mdtid=20411
order by s.ldate desc
RESULTS 1
DATE MDT IDPU Odometer DO Odometer Total Miles
12/6/2007 2041112810.6 12874.5 63.9
QUERY 2 (with Union)
select top 1 (s.ldate), v.mdtid, po.odometer, pi.odometer, (pi.odometer-po.odometer) as 'Total Miles'
from EventStrings ES
JOIN schedules s
ON ES.SchId=S.SchId
JOIN vehicles v
ON v.vehicleid=es.vehicleid
JOIN Events PO
ON PO.schid=es.schid
AND PO.EvStrId=ES.EvStrId
AND po.activity=4
JOIN Events PI
ON PI.schid=es.schid
AND PI.EvStrId=ES.EvStrId
AND pi.activity=3
WHERE es.providerid in (0,1,4)
and s.ldate>=[From Date,Date]
and s.ldate<=[To Date,Date]
and v.mdtid=20411
Union
select top 1 (s.ldate), v.mdtid, po.odometer, pi.odometer, (pi.odometer-po.odometer) as 'Total Miles'
from EventStrings ES
JOIN schedules s
ON ES.SchId=S.SchId
JOIN vehicles v
ON v.vehicleid=es.vehicleid
JOIN Events PO
ON PO.schid=es.schid
AND PO.EvStrId=ES.EvStrId
AND po.activity=4
JOIN Events PI
ON PI.schid=es.schid
AND PI.EvStrId=ES.EvStrId
AND pi.activity=3
WHERE es.providerid in (0,1,4)
and s.ldate>=?
and s.ldate<=?
and v.mdtid=2642
order by s.ldate desc
RESULTS 2
DATE MDT ID PU OdometerDO Odometer Total Miles
4/10/2007 20411 1207.21252.5 45.3
1/2/2007 2642 193652.6193817 164.4
As you can see, the results are sorted very differently. Is there any way to have the order by apply to both queries?
Thanks!
Craig
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May 12, 2008
Hi,
Im using a select query in which im using order by clause on a column which is varchar.
Im getting wrong result on using the query,
the result output is below
1036
1373
1610
2324
255
2819
324
459
477
581
698
831
can anyone help
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Dec 12, 2007
For my reports I have a Sort By parameter which has 2 values - Customer Name & Customer Number. for my dataset I have added @SortBy as parameter and assigned the value = Parameter!SortBy.value.
In the query I want to set the Order By clause based on the user selection. eg.:
select * from dbo.customers where name = @CustomerName order by @SortBy
However, I am unable to do this. I always get an exception for the order by clause no mater what. I have also tried the following queries in the query designer for the dataset customers but none of them work
="select * from dbo.customers where name " + @CustomerName + " order by " + @SortBy
select * from dbo.customers where name = @CustomerName order by + @SortBy
I know that I can set the interactive sort on the column headers and the interactive sort works, but the customer wants to have the ability to set the Sort By using the dropdown list.
Any input would be appreciated.
Thanks!
Arpan
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Sep 9, 2015
i want to know how to use order by clause in row wise
for example, suppose the rows is
10 20 30 40
so the output is should be
10
20
30
40
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Sep 13, 2007
Hi,
I am getting a wierd error while using order by in the over clause. Consider the following query:
select count (*) over (order by STD_CLL_CNTR_KEY) as cnt
from FCT_CLL_CS_DTLS
The error reported is :
Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'order'.
But at the same time this particular query seems to be working fine:
select rank () over (order by STD_CLL_CNTR_KEY) as cnt
from FCT_CLL_CS_DTLS
Am I missing something fundamental or is there a bigger issue.
Thanks in advance,
Regards,
Emil
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Sep 7, 2007
I have just transferred my site to a new server with SBS R2 Premium, so the site's database changed from SQL 2000 to SQL 2005. I find that searches are now returning results in random order, even though they use a view with an Order By clause to force the order I want.
I find that the results are unordered when I test the view with Management Studio, so the issue is unrelated to my VB/ASP Net code.
Using my SQL update tool (SQL Compare, from Redgate) I find that there are no differences in the views, or the underlying tables.
Using Management Studio to test a number of views, I find that I have a general problem with all views. For example, one of the simpler views is simply a selection of fields from one table, with an Order By clause on the tables primary key: - SELECT TOP (100) PERCENT GDQid, GDQUser, GDQGED, GDQOption, gdqTotalLines, GDQTotalIndi, GDQRestart, GDQCheckpointMessage, GDQStarted, GDQFinished, gdqCheckpointRecordCountr FROM dbo.GEDQueue ORDER BY GDQid DESC
If I right-click the view (from Management Studio's Object Explorer pane), select Design from the menu to show the view's design, and then click the Execute SQL icon, the view's results are displayed perfectly, in descending order of GDQid. However, if I select "Open View" the view's results are displayed out of order.
When I do this with the SQL 2000 database, both Design/Execute and Open View correctly display the data in the correct order.
Is there something that I should check in the SQL 2005 installation - some option that has been set incorrectly?
Regards, Robert Barnes
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May 22, 2008
Hi,I'm trying to remove certain words from my Order clause. For example on iTunes they have removed the word 'The' from the start of artist names so that all the bands that start with 'The' don't appear grouped together. I'm trying to do a similar thing with University names so that all universities which begin with 'University of' or 'The' don't appear together.Is this possible?Thanks for your help!,Curt.
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