Inconsistant Query Results With Count(*)... Bad Index?
Jul 20, 2005
I have a table that seems to have a bad index. When I do the following
query I get inconsistant and needless to say incorrect results.
select count(*) from mytable where mycolumn = 1
If I remove the index from "mycolumn" the query works correctly. If I
add the index back (even with a new name etc...) it doesn't work
right.
Has anyone ran into this? or does anyone know how I can fix this
problem?
It seems that removing the index is not really removing everything
because when I add a new one I get this same problem... btw, this is
isolated to this column on this table. all other indexes within the
database are fine.
I need to query the count of an occurrence in a given period of time, so I created this query. But it does not give me any results.
SELECT TOP 1000 o.[ID] ,o.[TimeOfOrder] ,x.[StreeLine1] FROM [SC].[dbo].[bvc_Order] o FULL JOIN SC.dbo.xmlAddressRead x ON o.ID= x.id WHERE DATEDIFF(HOUR,o.[TimeOfOrder],(DATEADD(Hour, -48, GETDATE()))) < 48 GROUP BY x.[StreeLine1], o.ID, o.TimeOfOrder HAVING COUNT(x.[StreeLine1])>1
Then I change the query slightly and I ask it to show me the ones that are going to '599 Ships Landing Way' and it gives me 356 results! The Query doesn't crash, but it doesn't give me the results I need. What did I do incorrectly?
SELECT TOP 1000 o.[ID] ,o.[TimeOfOrder] ,x.[StreeLine1] FROM [SC].[dbo].[bvc_Order] o FULL JOIN SC.dbo.xmlAddressRead x ON o.ID= x.id WHERE DATEDIFF(HOUR,o.[TimeOfOrder],(DATEADD(Hour, -48, GETDATE()))) < 48 AND x.[StreeLine1]='599 Ships Landing Way'
SELECT COUNT(id) as viewcount from location_views WHERE createdate>DATEADD(dd,-30,getdate()) AND objectid=357 SELECT COUNT(id)*2 as clickcount FROM extlinks WHERE createdate>DATEADD(dd,-30,getdate()) AND objectid=357
But I want to add the COUNT statements, so this is what I did:
select COUNT(vws.id)+COUNT(lnks.id)*2 AS totalcount FROM location_views vws,extlinks lnks WHERE (vws.createdate>DATEADD(dd,-30,getdate()) AND vws.objectid=357) OR (lnks.createdate>DATEADD(dd,-30,getdate()) AND lnks.objectid=357)
Turns out the query becomes immensely slow. There must be something I'm doing wrong here which results in such bad performance, but what is it?
SQL 2000I have a table with 5,100,000 rows.The table has three indices.The PK is a clustered index and has 5,000,000 rows - no otherconstraints.The second index has a unique constraint and has 4,950,000 rows.The third index has no constraints and has 4,950,000 rows.Why the row count difference ?Thanks,Me.
My query returns a table of results, I would like to add a count columnthat contains the number of each result type returned.i.e.Type Count1 31 31 32 22 23 43 43 43 44 24 2Because there are 3 of type 1, 2 of type 2, 4 of type 3 etc...Is there straightforward way of doing this in SQL?Thanks
Just a quick question, how do I divide the results of these two queriestogether ?(select count (*) as ontime from schedule where actualarrivaldate <=estimatearrivaldate)(select count (*) as total from schedule)Thanks for any helpRobert
I have a store procedure "Get_Student_By_District" ParameterDistrictID if null return all Return: Value(DistrictID, DistricName, SchoolID, SchoolName, TeacherID, TeacherName, StudentID, StudentName)
I will need to write another store procedure to calculate the additional 7 fields and include all the information it already has to have one dataset for my table in a Report.
1. Number of Students for a given Teacher 2. Number of Students for a given School 3. Number of Students for a given District 4. Number of Teachers for a given School 5. Number of Teachers for a given District 6. Number of Schools for a given District 7. Number of Districts
hi, like, if i need to do delete some items with the id = 10000 then also need to update on the remaining items on the with the same idthen i will need to go through all the records to fetch the items with the same id right? so, is there something that i can use to hold those records so that i can do the delete and update just on those records and don't need to query twice? or is there a way to do that in one go ?thanks in advance!
I have a DTS package that runs once a week. There is a xp_sendmail SQL task at the end that sends emails to our field sales people with a file attachment based on the results of the DTS package. Simple enough.
The problem I have is that the sendmail chokes when the mail task is executed at the end of the package - sometimes. And when it does fail, the DTS step with the sendmail can be executed separately without a problem.
The error message the gets generated is:
MAPI_E_NETWORK_ERROR80040115-2147221227
This does not make sense. If there was a network problem I should still get a message when executing the step that failed 30 seconds prior...not the case.
The other odd thing is that this package has been running fine for about 3 mo with no troubles, but our mail server may have undergone some changes that I am not aware of so...anyway if anyone has any info or has come across this oddness please feel free to share with me what you know.
I am a t a loss here with this one.
Thanks in advance to anyone else with a dented skull that has an answer!
I succesfully did a MSSQL "file" restore of production to a different node yesterday. But failed to apply any transaction logs, it complained that one of the files have not been restored. On further investigation I found that one of the files are missing in sysfiles, but the file is in sysaltfiles.
This SQL statement does not return the same number files. SELECT * FROM <DB>..sysfilesSELECT * FROM master..sysaltfiles WHERE dbid= DB_ID('<DB>')
sp_helpdb '<DB>' gives the same result as sysfiles.
Hello. I currently have a website that has a table on one webpage. When a record is clicked, the primary key of that record is transfered in the query string to another page and fed into an sql statement. In this case its selecting a project on the first page, and displaying all the scripts for that project on another page. I also have an additional dropdownlist on the second page that i use to filter the scripts by an attribute called 'testdomain'. At present this works to an extent. When i click a project, i am navigated to the scripts page which is empty except for the dropdownlist. i then select a 'testdomain' from the dropdownlist and the page populates with scripts (formview) for the particular test domain. what i would like is for all the scripts to be displayed using the formview in the first instance when the user arrives at the second page. from there, they can then filter the scripts using the dropdownlist. My current SQL statement is as follows. SelectCommand="SELECT * FROM [TestScript] WHERE (([ProjectID] = @ProjectID) AND ([TestDomain] = @TestDomain))" So what is happening is when testdomain = a null value, it does not select any scripts. Is there a way i can achieve the behaivour of the page as i outlined above? Any help would be appreciated. Thanks, James.
Two tables: CompanyPrices(CompanyID, ProductID, Price), CompanyRegion(CompanyID, Region) ProductID is the primary key.
I want to get 10 smallest prices in each Region. In other words, I am looking for 10 cheapest prices in each region. So, if there are 20 regions, I should get excatly 200 rows having prices for products from 200 companies if there were at least 10 companies in each region.
I tried the follwoing, but get incorrect results.
select S1.Region, S1.Price from (select CompanyPrices.*, Region from CompanyPrices inner join CompanyRegion on CompanyPrices.CompanyID=CompanyRegion.CompanyID) S1 inner join (select CompanyPrices.*, Region from CompanyPrices inner join CompanyRegion on CompanyPrices.CompanyID=CompanyRegion.CompanyID) S2 on S1.Region = S2.Region group by S1.Region, S1.Price having count(*)<=10 order by S1.Region, S1.Price
However, if I want to get 10 cheapest products for each company, the above sql works by modifying the join condition. Instead of S1.Region = S2.Region , I use S1.CompanyID = S2.CompanyID and I get correct results for 10 cheapest products for each company.
select S1.CompanyID, S1.Price from (select CompanyPrices.*, Region from CompanyPrices inner join CompanyRegion on CompanyPrices.CompanyID=CompanyRegion.CompanyID) S1 inner join (select CompanyPrices.*, Region from CompanyPrices inner join CompanyRegion on CompanyPrices.CompanyID=CompanyRegion.CompanyID) S2 on S1.CompanyID = S2.CompanyID group by S1.CompanyID, S1.Price having count(*)<=10 order by S1.CompanyID, S1.Price
I am not sure what is wrong in the first query and why it does not work when the second one works. Could someone help in making the first query work to give me correct results?
Hey all - VERY new to SQL so I apologize if I butcher normally trivial things :)
Looking to run a query that will retrieve the number of results returned from a select statement...
Currently have a LicenseID table with a Software column...the statement that works on it's own that i've got is:
SELECT * FROM Software WHERE LicensesID = 2
Currently when I run that with the data so far I get 4 results returned to me...how can I add to that statement so that instead of displaying the results themselves, I just get the number 4 returned as a total number of results?
I'm reading a lot of data from a database using SqlDataReader. Now I'd like to report the progress to the user, but for this I need to know in advance how many items SqlDataReader will return.
Is there any way to get this 'number of expected results' from the SqlDataReader?
On SQL Server 2000. IBM X series, dual 2GHz Xeon processors, 3GB RAM, RAID 5 DB array and separate Mirrored drive for OS, Windows 2000 Server.
Note: I should have moved the log files to the mirrored volume - I only just noticed it wasn't like that ... oops.:o It only has the OS and backup files (different logical volumes).
Problem: I have a Bill of Material system. It has a batch (Stored Procedure) that explodes Order Line Items. Each line has about 40 components.
The SP has 5 major steps to explode the Assembly, figure out colors/sizes to get the actual part numbers, assign quantities, update flags on the line item table (that has 3,500,000 rows but is not a clustered index - fill factor 85% on the unique autonumber index I use for the updates). The SP is jam packed with User Function calls, sub-Stored Procedures, and (yes) some cursors (on small declared temp tables created for each Order Line processed).
The execution plan for the whole batch of 100 is humongous - like 1000 pages, however nearly all steps are about 16 - 40 milliseconds to execute.
It normally takes 13 seconds to process 100 line items (3900 assembly rows created). However; about every 20th run, it takes 2 or 3 minutes ON THE VERY SAME LINE ITEMS. No programming changes! Run back-to-back, or with a minute or two delay. Then running it again, back to 13 seconds. Sometimes it takes 25 or so seconds, but that oddball 3 minutes is a killer.
I put some timing INSERTs into a temporary log file to localize the problem.
So; here's the REALLY weird thing. The part that experiences the intermittent 2 minute delay is a VERY SIMPLE call to a SP that INSERTs to the tbBATCHs table and gets the identity and passes it back with an Output variable. The tbBATCHs table only has about 8 columns. Nobody else uses it so it's not locking. It has an "If Exists" selection following the Insert to see if another batch is in progress not yet flagged as complete, but's not the issue because it's never true (hard coded values for testing forces this).
I have a Standby Server (duplicate config of main server) so I ran it there. Same issue.
If I loop 100 times on the tbBATCHs INSERT SP, it is pretty quick (like 2 seconds for all 100).
It's never on the first run, so I think it may be some sort of Log File catch-up.
Also; I DO NOT have Transaction Logging in place yet.
I've been trying to find out why a simple query containing a couple of top-level order bys produces different results when I introduce TOP into the query. I've found nothing so far, other than the results of both queries (TOP and non-TOP) are different again if I add an index.
All the DDL and DML is below, along with the results. The database uses the BIN2 collator.
I guess there's a simple explanation for this...
DROP table employeeCREATE TABLE employee( id INTEGER IDENTITY (1, 1) NOT NULL, givenname NVARCHAR (20), familyname NVARCHAR (20), CONSTRAINT pk_employee_id PRIMARY KEY (id));insert into employee values('John', 'Smith');insert into employee values('John', 'SMITH');insert into employee values('John', 'Smyth');insert into employee values('John', 'SMYTH');goselect top 10 givenname, familynamefrom employee order by lower(familyname) asc, lower(givenname) ascgo-- Dropping top produces results in different order!select givenname, familynamefrom employee order by lower(familyname) asc, lower(givenname) ascgo-- Creating an index results in different order on both queries!CREATE INDEX idx_employee_names ON employee (familyname, givenname);goselect top 10 givenname, familynamefrom employee order by lower(familyname) asc, lower(givenname) ascgoselect givenname, familynamefrom employee order by lower(familyname) asc, lower(givenname) ascgo
This produces the following results:
givenname familyname -------------------- -------------------- John SMITH John Smith John SMYTH John Smyth
(4 rows affected) givenname familyname -------------------- -------------------- John Smith John SMITH John Smyth John SMYTH
(4 rows affected) givenname familyname -------------------- -------------------- John Smith John SMITH John Smyth John SMYTH
(4 rows affected) givenname familyname -------------------- -------------------- John SMITH John Smith John Smyth John SMYTH
I have 2 tables. Product, ProductCategory. Product table consists of (productid, productname, producttypeid, createdate, portid) productcategory consists of (productid, categoryid, productcategoryid, categoryid, prodroletypeid, createdate) I want to write sql query to get the unique products. So the count should only give one value/resuls. But when I run the following query, I am getting more than one rows select count(distinct categoryid) as uniquecat from productcategory as pc, product as p where pc.prodroletypeid in ('P', 'F') and pc.createdate <= dateadd(d, 30, getdate()) and p.portid = 100 group by pc.productid
hello, this is my sql query with access: Dim SQLstr2 As String = "Select count(*) as total, oDate from Order_Details where oNo = " + Request("oNo") + " group by oDate"
However, problem is, I am clueless about how to access the data that is derived from my count(*).
I tried this: Response.Write(reader2("total"))
All I get is that No data exists for the row/column.
I tried not to select oDate and even took away the WHERE, but the same problem persists. Any ideas please?
I have an aggregate transform that outputs two columns, a group by (DT_STR) and a count(column name) (DT_UI8). The results are put into a Recordset Destination. When I attempt to map these columns to variables in a Foreach Loop Container (using a Foreach ADO Enumerator), I get the error:
Error: 0xC001F009 at ExtractNNRPersonUpdates: The type of the value being assigned to variable "User::NNRPersonCount" differs from the current variable type. Variables may not change type during execution. Variable types are strict, except for variables of type Object.
Error: 0xC001C012 at Foreach Household Loop Container: ForEach Variable Mapping number 2 to variable "User::NNRPersonCount" cannot be applied.
The variable mentioned in the error message is setup as a UInt64. I've tried all other integer data types and nothing works. I also tried changing the data type of the count coming out of the Aggregate transform but received a warning stating this isn't possible.
I have a large table (2+Million records, 2000+ new per day). If I want to count the records in one month, I could do :-
Select Count(*) from Table1 where Added_Date between '1999-12-01' and '1999-12-31'
or
Select Count(*) from Table1 where Added_Date >= '1999-12-01' and Added_Date <= '1999-12-31'
For these two above, I get the same result.
HOWEVER!!
If I then do:-
Select Count(*) from Table1 where Added_Date between '1999-12-01 00:00:00' and '1999-12-31 23:59:59' or use the >= and <= operators, the result is larger.
If I then do :-
Select Count(*) from Table1 where Added_Date between '1999-12-01 00:00:00.000' and '1999-12-31 23:59:59.999' or use the >= and <= operators, the result is larger still but i believe this including more rows than there actually is?.
I can get over the problem programatically using Convert to truncate to a day, month or year however, I don't understand why the results are different.
Any Ideas as to why this is happening, A'm I being stupid!!!!!!!
(PS Added_Date has a non_clustered index which has been rebuilt twice and DBCC finds no errors)
I have been reworking my index maintenance jobs from my old SQL 2000 table and view references to the DMV's and System Tables in SQL 2005, and I noted that some of my indexes end up being more fragmented after a reorganization and or rebuild. That doesn't make much sense to me at all. The code I am executing is:
Code Block print ' ' print '************* Beginning Index Updates for '+db_name()+' *************' print ' '
DECLARE @tablename varchar(250),
@indexname varchar(250), @fragpcnt decimal(18,1), @indexid int, @dbID int
-- Determine DB ID SELECT @dbID = DB_ID()
DECLARE tnames_cursor CURSOR FOR
SELECT b.name, c.name, a.avg_fragmentation_in_percent, a.index_id FROM sys.dm_db_index_physical_stats (@dbID, NULL, NULL, NULL, NULL) a
JOIN sys.indexes b ON a.object_id = b.object_id
AND a.index_id = b.index_id JOIN Sys.objects c ON b.object_id = c.object_id WHERE a.index_id > 0 ORDER by a.page_count DESC
OPEN tnames_cursor FETCH NEXT FROM tnames_cursor INTO @indexname, @tablename, @fragpcnt, @indexid WHILE (@@fetch_status = 0)
BEGIN
-- Declare and determine the tablename ID declare @tablenameID int select @tablenameID = object_id(@tablename)
IF @fragpcnt > 30
BEGIN
EXEC('ALTER INDEX ['+@indexname+'] ON ['+@tablename+'] REBUILD') PRINT '***************************************************' PRINT 'Index '+@indexname+' was rebuilt.' PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'
SELECT @fragpcnt = avg_fragmentation_in_percent FROM sys.dm_db_index_physical_stats (@dbID, @tablenameID, @indexid, NULL, NULL) a
JOIN sys.indexes b ON a.object_id = b.object_id
AND a.index_id = b.index_id JOIN Sys.objects c ON b.object_id = c.object_id
PRINT 'Post Rebuild fragmentation Percent: ' + convert(varchar, @fragpcnt) + '%' PRINT '' END ELSE IF @fragpcnt BETWEEN 5 AND 30
BEGIN
EXEC('ALTER INDEX ['+@indexname+'] ON ['+@tablename+'] REORGANIZE') PRINT '***************************************************' PRINT 'Index '+@indexname+' was Reorganized.' PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'
SELECT @fragpcnt = avg_fragmentation_in_percent FROM sys.dm_db_index_physical_stats (@dbID, @tablenameID, @indexid, NULL, NULL) a
JOIN sys.indexes b ON a.object_id = b.object_id
AND a.index_id = b.index_id JOIN Sys.objects c ON b.object_id = c.object_id
PRINT '***************************************************' PRINT 'Index '+@indexname+' was left alone.' PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%' PRINT '' END FETCH NEXT FROM tnames_cursor INTO @indexname, @tablename, @fragpcnt, @indexid END print ' ' print '************* NO MORE TABLES TO INDEX *************' PRINT 'All indexes for the '+db_name()+' database have been updated.' print ' ' DEALLOCATE tnames_cursor
Below are some snipits of the output:
*************************************************** Index _dta_index_wuci_history_8_1123587141__K2_K5 was rebuilt. Original framentation Percent: 58.3% Post Rebuild fragmentation Percent: 58.3%
*************************************************** Index PK__batchjob__776C5C84 was left alone. Original framentation Percent: 0.0%
*************************************************** Index PK__ContactWebDetail__116A8EFB was rebuilt. Original framentation Percent: 44.4% Post Rebuild fragmentation Percent: 77.8%
*************************************************** Index PK__managed_object_s__5DCAEF64 was left alone. Original framentation Percent: 0.0%
*************************************************** Index kb_IX_kb_scope_scope_role was rebuilt. Original framentation Percent: 75.0% Post Rebuild fragmentation Percent: 87.5%
*************************************************** Index PK__query__09A971A2 was left alone. Original framentation Percent: 0.0%
*************************************************** Index PK__email_message__38996AB5 was rebuilt. Original framentation Percent: 85.7% Post Rebuild fragmentation Percent: 0.0%
If the index begins with PK, then it is the primary key index which is generally the clustered index on the table, but not always. If it has an IX on it, it is generally a non-clustered index on the table, but again not always. In the case of the above, the PK is a clustered index, and the IX is a non-clustered index.
Anyone have any ideas why this is functioning in this manner?
The documentation for sp_trace_generateevent states that the following arguments are available:
Arguments [ @eventid=] event_id Is the ID of the event to turn on. event_id is int, with no default. The ID must be one of the event numbers from 82 through 91, which represent user-defined events as set with sp_trace_setevent. [ @userinfo= ] 'user_info' Is the optional user-defined string identifying the reason for the event. user_info is nvarchar(128), with a default of NULL. [ @userdata= ] user_data Is the optional user-specified data for the event. user_data is varbinary(8000), with a default of NULL.
@userinfo is stored in the textdata column, which after inspecting sys.trace_columns is of type text with a max size of 1073741824.
@userdata is stored in the binarydata column whose type is image with a max size of 1073741824.
I am attempting to build a stack trace of sorts that will capture detailed information about the run-time code executed when an error (contained within a try/catch) occurred.
The sql returned from dm_exec_sql_text goes well beyond 8000 and is getting truncated.
I haven't found any hot-fixes for SQL Server 2005 that addresses this issue. Has anyone else bumped into this limitation or found any explanation on the inconsistency between the stored procedure€™s arguments and the column types that the values are stored in?
My full-text search isn't working at all! I have a temporary table with full-text indexing enabled where files are scanned for social security numbers. If it has one, the user will see a message that it believes it's found a SSN and won't upload it. There is only ever one row in this table, as we overwrite the contents upon each upload.
I'm testing this search, and it doesn't work. The table has the following columns: attachemtId (int) - primary key fileContent (image) - contents of the file fileExtension (varchar) - extension of the file (this is always either ".pdf" or ".doc")
I created a .doc file that simply says "ssn", and then run the following query:
SELECT * FROM TempAttachment WHERE CONTAINS(fileContent,'ssn')
and nothing is returned! I tried the same thing with a .pdf file, and same results.
I'm not sure if this is related, but earlier I had this issue where I had to reset permissions for the directory. I've tried removing the full-text index and adding it again, but that didn't do anything. I also checked error logs on the server, and there were no messages. Any help would be appreciated! Thank you!
We have a table that is Full Text Search index enabled on one column.This table has 200 lakhs of rows(20000000) . ContainsTable() function is searching data with in these 200 lakhs of rows(20000000), if any new rows are inserted then the ContainsTable is not going to search in these recent inserted rows.
We observed when we try for a data to search. it is returning the rows till the rows that are inserted date is less than 30th of march 2012. but not searching in the records that are created after April month , if even the data we are searching is available .
TableFulltextItemCount is around 2.2 crores.
Then we done rebuilt the FT catalog Index. then the TableFulltextItemCount became 0.Again we run the containstable query ,but still it is not getting results.
As the no of rows are very more . so i am not able to show the actual rows from which the data is not coming.
the below query gives 2 results that are from actual base table
HTML Code: select * from g_case_action_log where cas_details like '%235355%' and product_id = 38810
To search for the same above word using FTS,I have used the query as below
HTML Code: SELECT Distinct top 50 cal.case_id,cal.cas_details From g_case_action_log cal (READUNCOMMITTED)inner join containstable(es.g_case_action_log, cas_details, ' ("235355" OR "<br>235355" OR "235355<br> ") ') as key_tbl on cal.log_id = key_tbl.[key] Where cal.product_id = 38810 ORDER By cal.case_id DESC
I have attached one sql script file for your ref that contains create logic and index schema properties
The following query returns a value of 0 for the unit percent when I do a count/subquery count. Is there a way to get the percent count using a subquery? Another section of the query using the sum() works.
Here is a test code snippet:
--Test Count/Count subquery
declare @Date datetime
set @date = '8/15/2007'
select -- count returns unit data Count(substring(m.PTNumber,3,3)) as PTCnt, -- count returns total for all units
(select Count(substring(m1.PTNumber,3,3))
from tblVGD1_Master m1
left join tblVGD1_ClassIII v1 on m1.SlotNum_ID = v1.SlotNum_ID
Where left(m1.PTNumber,2) = 'PT' and m1.Denom_ID <> 9
and v1.Act = 1 and m1.Active = 1 and v1.MnyPlyd <> 0
and not (v1.MnyPlyd = v1.MnyWon and v1.ActWin = 0)
and v1.[Date] between DateAdd(dd,-90,@Date) and @Date) as TotalCnt, -- attempting to calculate the percent by PTCnt/TotalCnt returns 0 (Count(substring(m.PTNumber,3,3)) /
(select Count(substring(m1.PTNumber,3,3))
from tblVGD1_Master m1
left join tblVGD1_ClassIII v1 on m1.SlotNum_ID = v1.SlotNum_ID
Where left(m1.PTNumber,2) = 'PT' and m1.Denom_ID <> 9
and v1.Act = 1 and m1.Active = 1 and v1.MnyPlyd <> 0
and not (v1.MnyPlyd = v1.MnyWon and v1.ActWin = 0)
and v1.[Date] between DateAdd(dd,-90,@Date) and @Date)) as AUPct -- main select
from tblVGD1_Master m
left join tblVGD1_ClassIII v on m.SlotNum_ID = v.SlotNum_ID
Where left(m.PTNumber,2) = 'PT' and m.Denom_ID <> 9
and v.Act = 1 and m.Active = 1 and v.MnyPlyd <> 0
and not (v.MnyPlyd = v.MnyWon and v.ActWin = 0)
and v.[Date] between DateAdd(dd,-90,@Date) and @Date
SELECT a.AssetGuid, a.Name, a.LocationGuid FROM Asset a WHERE a.AssociationGuid IN ( SELECT ada.DataAssociationGuid FROM AssociationDataAssociation ada WHERE ada.AssociationGuid = '568B40AD-5133-4237-9F3C-F8EA9D472662')
takes 30-60 seconds to run on my machine, due to a clustered index scan on our an index on asset [about half a million rows]. For this particular association less than 50 rows are returned.
expanding the inner select into a list of guids the query runs instantly:
SELECT a.AssetGuid, a.Name, a.LocationGuid FROM Asset a WHERE a.AssociationGuid IN ( '0F9C1654-9FAC-45FC-9997-5EBDAD21A4B4', '52C616C0-C4C5-45F4-B691-7FA83462CA34', 'C95A6669-D6D1-460A-BC2F-C0F6756A234D')
It runs instantly because of doing a clustered index seek [on the same index as the previous query] instead of a scan. The index in question IX_Asset_AssociationGuid is a nonclustered index on Asset.AssociationGuid.
The tables involved:
Asset, represents an asset. Primary key is AssetGuid, there is an index/FK on Asset.AssociationGuid. The asset table has 28 columns or so... Association, kind of like a place, associations exist in a tree where one association can contain any number of child associations. Each association has a ParentAssociationGuid pointing to its parent. Only leaf associations contain assets. AssociationDataAssociation, a table consisting of two columns, AssociationGuid, DataAssociationGuid. This is a table used to quickly find leaf associations [DataAssociationGuid] beneath a particular association [AssociationGuid]. In the above case the inner select () returns 3 rows.
I'd include .sqlplan files or screenshots, but I don't see a way to attach them.
I understand I can specify to use the index manually [and this also runs instantly], but for such a simple query it is peculiar it is necesscary. This is the query with the index specified manually:
SELECT a.AssetGuid, a.Name, a.LocationGuid FROM Asset a WITH (INDEX (IX_Asset_AssociationGuid)) WHERE a.AssociationGuid IN ( SELECT ada.DataAssociationGuid FROM AssociationDataAssociation ada WHERE ada.AssociationGuid = '568B40AD-5133-4237-9F3C-F8EA9D472662')
To repeat/clarify my question, why might this not be doing a clustered index seek with the first query?
ok can someone tell me why i get two different answers for the same query. (looking for last day of month for a given date)
SELECT DATEADD(ms, - 3, DATEADD(mm, DATEDIFF(m, 0, CAST('12/20/2006' AS datetime)) + 1, 0)) AS Expr1 FROM testsupplierSCNCR I am getting the result of 01/01/2007
-- The 3rd query uses an incorrect column name in a sub-query and succeeds but rows are incorrectly qualified. This is very DANGEROUS!!! -- The issue exists is in 2008 R2, 2012 and 2014 and is "By Design"
set nocount on go if object_id('tempdb.dbo.#t1') IS NOT NULL drop table #t1 if object_id('tempdb.dbo
[code]....
This succeeds when the invalid column name is a valid column name in the outer query. So in this situation the sub-query would fail when run by itself but succeed with an incorrectly applied filter when run as a sub-query. The danger here is that if a SQL Server user runs DML in a production database with such a sub-query which then the results are likely not the expected results with potentially unintended actions applied against the data. how many SQL Server users have had incorrectly applied DML or incorrect query results and don't even know it....?
For each customer, I want to add all of their telephone numbers to a different column. That is, multiple columns (depending on the number of telephone numbers) for each customer/row. How can I achieve that?
I want my output to be
CUSTOMER ID, FIRST NAME, LAST NAME, TEL1, TEL2, TEL3, ... etc
Each 'Tel' will relate to a one or more records in the PHONES table that is linked back to the customer.
However, as you can see, the original select query is run twice and joined together.What I was hoping for is this to be done in the original query without the need to duplicate the original query.
When I run the following query from Query Analyzer in SQL Serer 2005, I get a message back that says. Command(s) completed successfully. What I really need it to do is to display the results of the query. Does anyone know how to do this? declare @SniierId as uniqueidentifierset @SniierId = '85555560-AD5D-430C-9B97-FB0AC3C7DA1F'declare @SniierAlias as nvarchar(50)declare @AlwaysShowEditButton as bitdeclare @SniierName as nvarchar (128)/* Check access for Sniier */SELECT TOP 1 @SniierName = Sniiers.SniierName, @SniierAlias = Sniiers.SniierAlias, @AlwaysShowEditButton = Sniiers.AlwaysShowEditButtonFROM SniiersWHERE Sniiers.SniierId=@SniierId
