Very Slow Query (select Count(*) From Table)
Feb 15, 2006
Dear MS SQL Experts,
I have to get the number of datasets within several tables in my MSSQL
2000 SP4 database.
Beyond these tables is one table with about 13 million entries.
If I perform a "select count(*) from table" it takes about 1-2 min to
perform that task.
Since I know other databases like MySQL which take less than 1 sec for
the same task
I'm wondering whether I have a bug in my software or whether there are
other mechanisms to get the number of datasets for tables or the number
of datasets within the whole database.
Can you give me some hints ?
Best regards,
Daniel Wetzler
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Mar 4, 2005
OK heres the situation, I have a Categories table and a Products table, each Category can have one or many Products, but a product can only belong to one Category hence one-to-many relationship.
Now I want to do a SELECT query that outputs all of the Categories onto an ASP page, but also displays how many Products are in each category eg.
CatID | Name | Description | No. Products
0001 | Cars | Blah blah blah | 5
etc etc
At the moment I'm doing nesting in my application logic so that for each category that is displayed, another query is run that returns the number of products for that particular category. It works ok!
However, is there a way to write a SQL Statement that returns all the Categories AND number products from just the one SELECT statement, rather than with the method I'm using outlined above? The reason I'm asking is that I want to be able to order by the number of products for each category and my method doesn't allow me to do this.
Many thanks!
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Feb 14, 2008
Hi,
I am with the response time for a simple count on a fulltext search that is too slow.
Even using the most simple query on a good server (64 bit Dual Opteron 4GB Ram with high speed 16 raid disk storage)):
select count(*) from content_books where contains(searchData,'"english"')
Takes 4 seconds to count the avg 500.000 resultsI have removed all the joins with real table data so that the query is only inside the fulltext engine..
I would expect this to be down to 4 milli seconds. Isn't it just getting the size of the "english" word result index?
It seems the engine is going through all the results because if a do a more complex search that returns less results the performance is better.
Any clues of how to do this faster? I never read the thousands of records BUT i need to count them...
Thank you very much.
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Aug 27, 2007
I have a SELECT TOP query in order to return x number of top records from a table which has the indexing service enabled on it, such as this :
SELECT TOP(15) * FROM [TableName] ORDER BY [ColumnName]
and also there are not that many records(MAX 100 rows) kept in the table at the moment however, it will grow later.
The issue stems out from the ORDER BY [ColumnName] part of the syntax that changes the TOP selection order which makes the query to run very slow as I have also analyzed in the SQL SERVER QUERY ANALYZER.
Anyhow, I need to have the ORDER BY statement to show the data based on different columns either ascending or descending.
There might we workarounds to achieve the same goal that I am not aware of.
Any thoughts is appreciated.
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Aug 4, 2000
SELECT * on a 4000 row table is taking more than 12 seconds.
Other larger tables are not nearly as slow.
I've DBCC dbreindex'd, and dbcc showcontig shows density at 100%.
How can I figure out why this is happening?
What are some remedies?
Thanks for your help.
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Aug 5, 2014
I have the following code.
SELECT _bvSerialMasterFull.SerialNumber, _bvSerialMasterFull.SNStockLink, _bvSerialMasterFull.SNDateLMove, _bvSerialMasterFull.CurrentLoc,
_bvSerialMasterFull.CurrentAccLink, _bvSerialMasterFull.StockCode, _bvSerialMasterFull.CurrentAccount, _bvSerialMasterFull.CurrentLocationDesc,
_bvSerialNumbersFull.SNTxDate, _bvSerialNumbersFull.SNTxReference, _bvSerialNumbersFull.SNTrCodeID, _bvSerialNumbersFull.SNTransType,
_bvSerialNumbersFull.SNWarehouseID, _bvSerialNumbersFull.TransAccount, _bvSerialNumbersFull.TransTypeDesc,
[code]...
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.
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Jun 11, 2008
Here's my tables:
-------------------------------------------------------
tblMembers
-------------------------------------------------------
MemberID | CountryID
-------------------------------------------------------
-------------------------------------------------------
tblCountries
-------------------------------------------------------
CountryID | CountryName
-------------------------------------------------------
-------------------------------------------------------
tblOrders
-------------------------------------------------------
OrderID | MemberID | OrderTypeID
-------------------------------------------------------
-------------------------------------------------------
tblSubscriptionOrders
-------------------------------------------------------
SubscriptionOrderID | OrderID | SubscriptionPackID
-------------------------------------------------------
-------------------------------------------------------
tblSubscriptionPacks
-------------------------------------------------------
SubscriptionPackID | TypeID
-------------------------------------------------------
Here's what I'm trying to do:
1. Output each country in one column
2. Output the number of subscriptions made from a member of that country where tblOrders.orderTypeID = 3 and tblSubscriptionPacks.TypeID = 1 in the next column
3. Output the number of subscriptions made from a member of that country where tblOrders.orderTypeID = 3 and tblSubscriptionPacks.TypeID = 2 in the next column
My problem was that I was doing joins, and I was somehow ending up with orders where the OrderTypeID was NOT equal to 3, even though I declared it specifically in the WHERE clause.
Can someone help me with this query?
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Nov 5, 2014
I have two tables. Houses and Guests. The guests are the people who visited the houses tied by the HouseNo.
I want to list all of the houses which has HouseName, Address, HouseNo. Then I want to show a column for the number of guests who visited it.
The Guest table has GuestName and HouseNo. How can I do a select on all houses and then show a column of COUNT(GuestName) for all the guests with the HouseNo matching each row?
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Jul 30, 2013
I want to show the number of rows returned by a select query in the result.
e.g. select policy,policynumber,datecreated,Firstname, '-' as recordcount from policy
If it returns 5 rows, then the 'recordcount' need to show '5' in all row in the result
OutPut
0y96788,HGYG564,29/07/2013,SAM,5
FJUFBN7,JLPIO67,29/07/2013,Test,5
...
..
..
How can i get this number in the result.
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Sep 3, 2007
Hello... im having a problem with my query optimization....
I have a query that looks like this:
SELECT * FROM table1
WHERE location_id IN (SELECT location_id from location_table WHERE account_id = 998)
it produces my desired data but it takes 3 minutes to run the query... is there any way to make this faster?... thank you so much...
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Jun 20, 2007
I've found example code of accessing an SQLDataSource and even have it working in my own code - an example would be Dim datastuff As DataView = CType(srcSoftwareSelected.Select(DataSourceSelectArguments.Empty), DataView) Dim row As DataRow = datastuff.Table.Rows(0) Dim installtype As Integer = row("InstallMethod") Dim install As String = row("Install").ToString Dim notes As String = row("Notes").ToString The above only works on a single row, of course. If I needed more, I know I can loop it.The query in srcSoftwareSelected is something like "SELECT InstallMethod, Install, Notes FROM Software"My problem lies in trying to access the data in a simliar way when I'm using a SELECT COUNT query. Dim datastuff As DataView = CType(srcSoftwareUsage.Select(DataSourceSelectArguments.Empty), DataView) Dim row As DataRow = datastuff.Table.Rows(0) Dim count As Integer = row("rowcnt") The query here is "SELECT COUNT(*) as rowcnt FROM Software"The variable count is 1 every time I query this, no matter what the actual count is. I know I've got to be accessing the incorrect data member in the 2nd query because a gridview tied to srcSoftwareUsage (the SQLDataSource) always displays the correct value. Where am I going wrong here?
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Nov 20, 2006
Hi friends,
I have problem when retrieving a result from SELECT COUNT(*) FROM [Table] from an Oracle database.
When I try to put the result (single row) in a variable I get the following error message.
[Execute SQL Task] Error: An error occurred while assigning a value to variable "RowsSource": "Unsupported data type on result set binding RowsSource.".
Pls help me
Mahe
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Sep 25, 2007
Hi,
I have a table defined as such:
PosterArtId int no 4 10 0 no (n/a) (n/a) NULL
Graphic image no 16 yes (n/a) (n/a) NULL
GraphicFilename varchar no 50 no no no SQL_Latin1_General_CP1_CI_AS
I have a Stored Procedure defined in the database that queries this table (joins with some other tables) that takes about 1 1/2 minutes to return results (running directly in query analyzer). The table itself has 8900 records and the resulting stored procedure returns 33 rows.
I have backed up this database and restored it to another database on a different machine also running SQL Server 2000. When I run the same stored procedure on this 2nd database (note the contents of the database and this table are exactly the same), it runs very quickly - in about 2 seconds.
I'm trying to figure out what is causing the query to run so slow on the original database, which is our production database server (note that none of the other queries seem to be running extra slow on this machine, just this particular one).
I've since been reading up on storing images in the database and I don't think the images are stored "text in row" - I ran the command: €œSELECT OBJECTPROPERTY(OBJECT_ID('tblPosterArt'),'TableTextInRowLimit')€? and got a 0 return value.
My ultimate goal is to figure out:
1) why the timing is so different on the two databases even though the have the same data
2) is there something we can do to speed up the results on our production server
For the first goal, I'm heading down the path that something in the database backup/restore did not recreate the btree storage of the image data in the same manner. Would this be correct? If not, is there some kind of analysis that I can do that will tell me some useful information?
I've run the Stored Procedure for both databases in query analyzer with the "show execution plan", "trace", and "statistics" turned on. In the Execution Plan of the production database I see a significant amount of time in three areas: Nested Loops/Left Semi Join, Clustered Index Scan, and Clustered Index Seek. But being as I'm not a dba (nor do we have one on staff), I'm not sure how to interpret this data. I keep wanting to point to some sort of environment issue since the data is the same between the two machines.
I suppose there is nothing to do about the 2nd goal without knowing why the query on the one machine is taking so long. Any thoughts on how to get more information here?
Thanks,
Beth
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Oct 15, 2007
Hello,
I hope someone can answer this, I'm not even sure where to start looking for documentation on this. The SQL query I'm referencing is included at the bottom of this post.
I have a query with 3 select statements joined together like tables. It works great, except for the fact that I need to declare a variable and make it a table within two of those 3. The example is below. You'll see that I have three select statements made into tables A, B, and C, and that table A has a variable @years, which is a table.
This works when I just run table A by itself, but when I execute the entire query, I get an error about the "declare" keyword, and then some other errors near the word "as" and the ")" character. These are some of those errors that I find pretty meaningless that just mean I've really thrown something off.
So, am I not allowed to declare a variable within these SELECT tables that I'm creating and joining?
Thanks in advance,
Andy
Select * from
(
declare @years table (years int);
insert into @years
select
CASE
WHEN month(getdate()) in (1) THEN year(getdate())-1
WHEN month(getdate()) in (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) THEN year(getdate())
END
select
u.fullname
, sum(tx.Dm_Time) LastMonthBillhours
, sum(tx.Dm_Time)/((select dm_billabledays from dm_billabledays where Dm_Month = Month(GetDate()))*8) lasmosbillingpercentage
from
Dm_TimeEntry tx
join
systemuserbase u
on
(tx.owninguser = u.systemuserid)
where
Month(tx.Dm_Date) = Month(getdate())-1
and
year(dm_date) = (select years from @years)
and tx.dm_billable = 1
group by u.fullname
) as A
left outer join
(select
u.FullName
, sum(tx.Dm_Time) Billhours
, ((sum(tx.Dm_Time))
/
((day(getdate()) * ((5.0)/(7.0))) * 8)) perc
from
Dm_TimeEntry tx
join
systemuserbase u
on
(tx.owninguser = u.systemuserid)
where
tx.Dm_Billable = '1'
and
month(tx.Dm_Date) = month(GetDate())
and
year(tx.Dm_Date) = year(GetDate())
group by u.fullname) as B
on
A.Fullname = B.Fullname
Left Outer Join
(
select
u.fullname
, sum(tx.Dm_Time) TwomosagoBillhours
, sum(tx.Dm_Time)/((select dm_billabledays from dm_billabledays where Dm_Month = Month(GetDate()))*8) twomosagobillingpercentage
from
Dm_TimeEntry tx
join
systemuserbase u
on
(tx.owninguser = u.systemuserid)
where
Month(tx.Dm_Date) = Month(getdate())-2
group by u.fullname
) as C
on
A.Fullname = C.Fullname
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Jul 9, 2001
In my database/MY SERVER (SQL7/Win2K), I run a simple query with a Table/10000 rows (without cluster index):
SELECT * FROM TABLE
it take over 30s. Why it's slow? How can I check for reason? How to configure my server to improve performance?
Thanks in advance.
TH
----------------------------------
SP_CONFIGURE's RESULT in MY SERVER
----------------------------------
Table 'spt_values'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 0.
name minimum maximum config_value run_value
----------------------------------- ----------- ----------- ------------ -----------
affinity mask 0 2147483647 0 0
allow updates 0 1 1 1
cost threshold for parallelism 0 32767 5 5
cursor threshold -1 2147483647 -1 -1
default language 0 9999 0 0
default sortorder id 0 255 52 52
extended memory size (MB) 0 2147483647 0 0
fill factor (%) 0 100 0 0
index create memory (KB) 704 1600000 0 0
language in cache 3 100 3 3
language neutral full-text 0 1 0 0
lightweight pooling 0 1 0 0
locks 5000 2147483647 0 0
max async IO 1 255 32 32
max degree of parallelism 0 32 0 0
max server memory (MB) 4 2147483647 2147483647 2147483647
max text repl size (B) 0 2147483647 65536 65536
max worker threads 10 1024 255 255
media retention 0 365 0 0
min memory per query (KB) 512 2147483647 1024 1024
min server memory (MB) 0 2147483647 0 0
nested triggers 0 1 1 1
network packet size (B) 512 65535 4096 4096
open objects 0 2147483647 0 0
priority boost 0 1 1 1
query governor cost limit 0 2147483647 0 0
query wait (s) -1 2147483647 -1 -1
recovery interval (min) 0 32767 0 0
remote access 0 1 1 1
remote login timeout (s) 0 2147483647 5 5
remote proc trans 0 1 0 0
remote query timeout (s) 0 2147483647 0 0
resource timeout (s) 5 2147483647 10 10
scan for startup procs 0 1 0 0
set working set size 0 1 0 0
show advanced options 0 1 1 1
spin counter 1 2147483647 10000 10000
time slice (ms) 50 1000 100 100
two digit year cutoff 1753 9999 2049 2049
Unicode comparison style 0 2147483647 196609 196609
Unicode locale id 0 2147483647 1033 1033
user connections 0 32767 0 0
user options 0 4095 0 0
Table 'spt_values'. Scan count 43, logical reads 108, physical reads 0, read-ahead reads 0.
Table 'sysconfigures'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 2.
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Jul 20, 2005
I am having performance issues on a SQL query in Access. My query isaccessing and joining several tables (one very large one). The tables arelinked ODBC. The client submits the query to the server, separated byseveral states. It appears the query is retrieving gigs of data from thetable and processing the joins on the client. Is there away to perform moreof the work on the server there by minimizing the amount of extraneous tabledata moving across the network and improving performance (woefully slowabout 6 hours)?
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Mar 13, 2006
HelloI have this stored procedure:SELECT @openissue=ISNULL(COUNT(*),0) FROM TOpenIssue WHERE TOpenIssue .Code <> 'CLOSED' and Project=@project AND DateDIFF( day, TOpenIssue .DateStart, GETDATE() ) >= 0SELECT @oiclosed=ISNULL(COUNT(*),0) FROM TOpenIssue WHERE TOpenIssue .Code = 'CLOSED' and Project=@project SELECT @oipastdue=ISNULL(COUNT(*),0) FROM TOpenIssue WHERE TOpenIssue .Code <> 'CLOSED' and Project=@project AND TOpenIssue .DateEnd<getdate()Is there away to optimize it in only one select statement?Thanks
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Jan 16, 2007
Hello,
Brief overview. Got 2 tables, client table and document table. Both tables have client name as the primary key. Client table shows client info, address, phone, dob. Document table shows client name, document, document type.
I need to write a query that will count how many documents are in the table for each name.
This is attempt at it, please let me know whats wrong. Thanks.
SELECT count [client table].client name as cli_name, count ([document table].name as doc_qty)
FROM [client table] INNER JOIN [document table] ON [client table].id = [document table].ID
GROUP BY [client table].name
ORDER BY [client table].name
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Apr 5, 2008
Hi,
I'm a beginner with query sql and i'm french sorry for my english !
i have 3 table in sql server 2005:
PERSONNE: person_id (clef), nom (varchar), prenom (varchar)
FORMATION : formation_id (clef), person (foreign key), titre (varchar), actif (bit)
EXPERIENCE: experience_id(pk), personne (foreign key), description (varchar), actif(bit)
I would like to display the person_ID, the total row for formation actif = 1 by person and formation actif = 0 by person and experience actif = 1 by person and experience actif = 0 by person
the result must be:
person_ID nbFormationActif NbFormationInactif NbExpActfi
1 2 5 4
2 1 2 5
...
NbExpInactif
0
3
I have doing a simple query who display total experience actif and inactif for all people but now i'm must to do the SAME THING in the SAME QUERY FOR FORMATION and i'm still block!!!
someone can help me ?
SELECT PERSONNE.Person_ID ,COUNT(PERSONNE.Person_ID) AS totExpAct, totExpInactif
FROM
(
SELECT PERSONNE.Person_ID ,COUNT(PERSONNE.Person_ID) AS totExpInactif
FROM PERSONNE INNER JOIN EXPERIENCE
ON PERSONNE.Person_ID = EXPERIENCE.Personne
AND EXPERIENCE.Actif = 0
GROUP BY PERSONNE.Person_ID
)
PERSONNE INNER JOIN EXPERIENCE
ON PERSONNE.Person_ID = EXPERIENCE.Personne
AND EXPERIENCE.Actif = 1
GROUP BY PERSONNE.Person_ID, totExpInactif
...
Thanks for all
Christophe
Im' null in query :-)
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Oct 8, 2012
I have added some SQL to an Access form which updates the dbo_BM_Map table when the user hits the Apply button. There is a temp table with various fields, two being "Chapter_No" and "Initial_Mapping_Complete" which the update is based on.
I want this update to only apply to chapters that only have one name in the "Initial_Mapping_Complete" column. If a chapter has more than one then the update should ignore it. The attached screengrab shows you. The update should ignore chapter 19 as there are two people (Jim and James) in the Initial_Mapping_Complete field. Here is my code.
pdate dbo_BM_Map inner Join Temp_Progression_Populate
on dbo_BM_Map.Product_ID = Temp_Progression_Populate.Product_ID
Set dbo_BM_Map.Initial_Mapping_Complete = Temp_Progression_Populate.Initial_Mapping_Complete
Where dbo_BM_Map.Chapter_No = Temp_Progression_Populate.Chapter_No
And Temp_Progression_Populate.Initial_Mapping_Complete in
(Select count(Initial_Mapping_Complete), Chapter_No
from Temp_Progression_Populate
Group by Chapter_No
Having Count(Initial_Mapping_Complete) = 1)
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Mar 21, 2008
Hi Friends,
I want to have solution for one of the problem.
The requirement is like this :
I want to write stored procedure or function which will take parameter as SQL Server name, DB name, UserName and passwod.
This Stored proc will connect to Remote server using these parameters and will get the count of the rows in one of the table.
I created the connection using the linked server
EXEC sp_addlinkedserver @SerevrName,N'SQL Server'
EXEC sp_addlinkedsrvlogin @SerevrName, False, Null, @ServerUserName,@SerevrPws
Now I am trying to get count using following query :
set @SQLQuery = 'SELECT count(*) FROM [' + @SerevrName + '].' + @SrcDataBaseName +'.dbo.<<TableName>>'
But the question is that the execution goes this way :
exec(@SQLQuery)
Now how to assign this count value to some variable so that I can use it later ...?
Going forword I want to use cursor and get the rows in these table using cursor ...?
How can I assign values returned from any runtime query to temporary variable or table ...?
I tried another approach also:
I put remote connection and query execution in inner stored proc called usp_GetTableRowCount
set @SQLQuery = 'SELECT count(*) FROM [' + @SerevrName + '].' + @SrcDataBaseName +'.dbo.<<TableName>>'
exec(@SQLQuery)
and in outer stored proc : referenced the inner stored proc like this
exec @AFSDataRowCount = dbo.usp_GetTableRowCount <<Server Name>>,<<User Name>>, <<Password>>, <<DBName>>
The execution of dbo.usp_GetTableRowCount <<Server Name>>,<<User Name>>, <<Password>>, <<DBName>> gives me exact no of rows
but when I see value of AFSDataRowCount, I get 0.
Kindly help me out whereever I am making mistake or else pls tell me any other approach to follow.
Thanks in advance.
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Jun 26, 2015
how do I get the variables in the cursor, set statement, to NOT update the temp table with the value of the variable ? I want it to pull a date, not the column name stored in the variable...
create table #temptable (columname varchar(150), columnheader varchar(150), earliestdate varchar(120), mostrecentdate varchar(120))
insert into #temptable
SELECT ColumnName, headername, '', '' FROM eddsdbo.[ArtifactViewField] WHERE ItemListType = 'DateTime' AND ArtifactTypeID = 10
--column name
declare @cname varchar(30)
[code]...
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Dec 20, 2007
I have set up a 'Parameters' table that solely stores all pre-assigned selection values for a webform. I customized a stored query to Select the values from the Parameters table. I set up the webform. The result is that the form1.apsx automatically populates each DropDownList task with the pre-assigned values from the 'Parameters' table (for example, the stored values in the 'Parameters' table 'Home', 'Business', and 'Other' populate the drop down list for 'Type').
The programming to move the selected data from form1.aspx to a new table in the SQL database perplexes me. If possible, I would like to use the form1.aspx to Postback (or Insert) the "selected" data to a *new* column in a *new* table (such as writing the data to the 'CustomerType' column in the 'Customers' table; I clearly do not want to write back to the 'Parameters' table). Any help to get over this hurdle would be deeply appreciated.
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Jun 21, 2006
I have created two select clauses for counting weekdays. Is there a way to combine the two select together? I would like 1 table with two columns:
Jobs Complete Jobs completed within 5 days
10 5
-------------------------------------------------------------------------------------------------
SELECT COUNT(DATEDIFF(d, DateintoSD, SDCompleted) - DATEDIFF(ww, DateintoSD, SDCompleted) * 2) AS 'Jobs Completed within 5 days'
FROM dbo.Project
WHERE (SDCompleted > @SDCompleted) AND (SDCompleted < @SDCompleted2) AND (BusinessSector = 34) AND (req_type = 'DBB request ') AND
(DATEDIFF(d, DateintoSD, SDCompleted) - DATEDIFF(ww, DateintoSD, SDCompleted) * 2 <= 5)
---------------------------------------------------------------------------------------
Select COUNT(DATEDIFF(d, DateintoSD, SDCompleted) - DATEDIFF(ww, DateintoSD, SDCompleted) * 2) AS 'Total Jobs Completed'
From Project
WHERE (SDCompleted > @SDCompleted) AND (SDCompleted < @SDCompleted2) AND (BusinessSector = 34) AND (req_type = 'DBB request ')
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Jan 31, 2006
I'm currently working on a web frontend which was designed for mysql but is being moved over to mssql.
The current system uses a select query to create a table:
Code:
CREATE TABLE newtable AS SELECT afield FROM atable
This doesn't seem to work in mssql.
Is there an equivilant in mssql which can be used?
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Oct 21, 2015
I have a select query on table unify, here i want to display the "Desc" value from JKS table instead of "u.code" field
SELECT
u.id,
(
+ISNULL(u.desc,'')+' '
+ISNULL(u.code,'')+' '
)
from Unify u
another table 'JKS'
code | Desc
-------------
001 | LCC
002 | HHT
003 | ICH
004 | Unify
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Jul 26, 2005
My table looks like this:char(150) HTTP_REF,char(250) HTTP_USER,char(150) REMOTE_ADDR,char(150) REMOTE_HOST,char(150) URL,smalldatetime TIME_STAMPThere are no indexes on this table and there are only 293,658 records total.When I do a select like this it takes forever:SELECT COUNT(DISTINCT REMOTE_ADDR)Takes 2 minutes. Is there anyway to speed that up?Thanks
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Jul 20, 2005
Hello.I test some query on sql server 2000 (sp2 on OS windows 2000) and iwant to know why a simple query like this :select * from Table Where Column like '%value'is more slow on 2000 than on sql 7.And this case arrive only if the % character is in the begin.If you test this :select * from Table Where Column like 'v%alue'then it's more fast on 2000.I look the execution plan, there is a difference but this differenceis the same in all the case i test (for the two query i write in thismessage for example).I don't understand why and so, if someone have an explanation, andperhaps a solution ...Excuse my poor english language.And thanks for time people spend to answer me.
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Jul 20, 2005
hello,I have the following query. it returns result in less than 1 second.select *from employee e, address awhere e.id=a.emp_idand e.id=1234The problem is that it becomes extremely slow if i take the last lineout. So the query looks like:select *from employee e, address awhere e.id=a.emp_idThe above query is only supposed to return ~500 rows. but i stillhaven't got the result back after 30 minutes.Does anyone have any suggestions about troubleshooting this problem?Thank you in advance!Eddy
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Feb 1, 2008
hi, i need help with a query:SELECT Headshot, UserName, HeadshotId FROM tblProfile INNER JOIN Headshots ON Headshots.ProfileId=tblProfile.ProfileId WHERE (UserName= @UserName) this query will select what I want from the database, but the problem is that I have multiple HeadshotIds for each profile, and I only want to select the TOP/highest HeadshotId and get one row foreach headshotId. Is there a way to do that in 1 SQL query? I know how to do it with multiple queries, but im using SqlDataSource and it only permits one. Thanks!
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Sep 14, 2014
Till now I get data form multiple table using join, but unable to understand how can i get the this result based on given table -
Result should be -
ProCodeProductName
PRO00001;PRO00002Product Test SearchedPromotion One;Promotion Two
PRO00001;PRO00002;PRO00002Product Final SearchedPromotion One;Promotion Two;Promotion Three
PRO00002TestingPromotion Two
Tables -
select * from ProMaster
CodeName
PRO00001Promotion One
PRO00002Promotion Two
PRO00003Promotion Three
select * from ProDetail
IDProCodeProduct
1PRO00001;PRO00002Product Test Searched
2PRO00001;PRO00002;PRO00002Product Final Searched
3PRO00002Testing
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Aug 19, 2007
I am wondering if there is a direct query in this case:
I am developing a program to a company which simply sells services
One service may have different prices for different types of clients
The price of any service for any client can change at any time, and I should be able to trace these changes at any time
I made the following tables (simplified): (asterisk for primary key)
(Table) (Fields)
CLIENT_TYPES : ID*, ClientTypeName
SERVICES : ID*, ServiceName
PRICES : ServiceID*, ClientTypeID*, Price, Date*
ORDERS : ID*, Date, ClientTypeID
ORDER_SERVICES : OrderID*, ServiceID*
The field in bold is the area of the question
This is a sample data in the PRICES table:
ServiceID ClientTypeID Price Date1 1 100 1/1/20072 1 150 1/1/20071 2 90 1/1/20072 2 135 1/1/2007
Now if I want to update a price of service 1 for clienttype 1, I add the following row:
1 1 100 1/1/2008
So one product for one client can have any number of prices with different dates
The following query:
SELECT * FROM PRICES WHERE ClientTypeID = 1
will retrieve all prices with repeats for a specific client (#1 here)
What I want is a query to retrieve the most recent prices for specific client for all products, even if a query on query
If there is commemts on table design please tell me
thanks for any one who provides help
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