Newbie Basic Question - DISTINCT && PKs
Sep 1, 2006
Could somebody please clarify this simple question for me? I'm clearly missing something basic...
I'm in the process of trying to teach myself T-SQL out of a WROX book, and am having a problem wrapping my head around this example, I understand the concept of Primary Keys through using MS Access, but haven't used TSQL extensively (or at all for that matter...)
Using the classic "Northwind" database, using this query:
SELECT COUNT(OrderID)
FROM [Order Details]
This returns 2155, which is the total number of rows with an OrderID, the primary key. Now, as I understood it, a PK has to be unique, but yet this query on the same DB:
SELECT COUNT(DISTINCT OrderID)
FROM [Order Details]
returns 830 rows. If the PK (OrderID) is unqiue, how is the DISTINCT function returning fewer rows? Wouldn't that imply there are duplicate PKs?
I'm sure there's a simple answer to this, but I just can't seem to get my head around it... Thank you so much for taking the time to explain this to a rookie!
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Apr 28, 2004
I am using the SQL Server 2000 query analyser to write stored procedures for an SQL Server 2000 database.
I would like to find a debugger to help me "look into" my stored procedures as they are executed (e.g. to watch a Cursor fill a table row by row, see the contents of temporary tables as a stored procedure progresses, etc.)
Could anybody, please, direct me to-
* Any debugger that does this
OR
* Simple instructions how to run stored procedures from Visual Basic. I suspect :) that VB's debugger may be able to look into the SQL as it is being executed, but I don't actually know how to use VB itself.
Thanks very much,
Angelos
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Feb 24, 2007
Hi there
I sorry if I have placed this query in the wrong place.
I'm getting to grips with ASP.net 2, slowly but surely!
When i try to access my site which uses a Sql Server 2005 express DB i am receiving the following error:
Server Error in '/jarebu/site1' Application.
Database 'd:hostingmemberasangaApp_DataASPNETDB.mdf' already exists.Could not attach file 'd:hostingmemberjarebusite1App_DataASPNETDB.MDF' as database 'ASPNETDB'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Database 'd:hostingmemberasangaApp_DataASPNETDB.mdf' already exists.Could not attach file 'd:hostingmemberjarebusite1App_DataASPNETDB.MDF' as database 'ASPNETDB'.Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:
[SqlException (0x80131904): Database 'd:hostingmemberasangaApp_DataASPNETDB.mdf' already exists.
Could not attach file 'd:hostingmemberjarebusite1App_DataASPNETDB.MDF' as database 'ASPNETDB'.]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +735075
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1838
System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) +33
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +359
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +121
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +137
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +83
System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1770
System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +17
System.Web.UI.WebControls.DataBoundControl.PerformSelect() +149
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +70
System.Web.UI.WebControls.GridView.DataBind() +4
System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +82
System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() +69
System.Web.UI.Control.EnsureChildControls() +87
System.Web.UI.Control.PreRenderRecursiveInternal() +41
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210
This is the connection string that I am using:
<connectionStrings>
<add name="ConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ASPNETDB.MDF;Integrated Security=True;Initial Catalog=ASPNETDB;User Instance=True" providerName="System.Data.SqlClient"/>
</connectionStrings>
The database is definitly in the folder that the error message relates to.
What I'm finding confusing is that the connection string seems to be finding "aranga"s database.
Is it something daft?
Many thanks.
James
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Jul 6, 2007
Hi, I have the following script segment which is failing:
CREATE TABLE #LatLong (Latitude DECIMAL, Longitude DECIMAL, PRIMARY KEY (Latitude, Longitude))
INSERT INTO #LatLong SELECT DISTINCT Latitude, Longitude FROM RGCcache
When I run it I get the following error: "Violation of PRIMARY KEY constraint 'PK__#LatLong__________7CE3D9D4'. Cannot insert duplicate key in object 'dbo.#LatLong'."
Im not sure how this is failing as when I try creating another table with 2 decimal columns and repeated values, select distinct only returns distinct pairs of values.
The failure may be related to the fact that RGCcache has about 10 million rows, but I can't see why.
Any ideas?
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Mar 12, 2007
I need to run a SELECT DISTINCT query acrossmultiple fields, but I need to add another field that is NON-DISTINCTto my record set.Here is my query:SELECT DISTINCT lastname, firstname, middleinitial, address1,address2, city, state, zip, age, genderFROM gpresultsWHERE age>='18' and serviceline not in ('4TH','4E','4W')and financialclass not in ('Z','X') and age not in('1','2','3','4','5','6','7','8','9','0')and (CAST (ADMITDATE AS DATETIME) >= DATEDIFF(day, 60, GETDATE()))ORDER BY zipThis query runs perfect. No problems whatsoever. However, I need toalso include another field called "admitdate" that should be treatedas NON-DISTINCT. How do I add this in to the query?I've tried this but doesn't work:SELECT admitdateFROM (SELECT DISTINCT lastname, firstname, middleinitial, address1,address2, city, state, zip, age, gender from gpresults)WHERE age>='18' and serviceline not in ('4TH','4E','4W')and financialclass not in ('Z','X') and age not in('1','2','3','4','5','6','7','8','9','0')and (CAST (ADMITDATE AS DATETIME) >= DATEDIFF(day, 60, GETDATE()))ORDER BY zipThis has to be simple but I do not know the syntax to accomplishthis.Thanks
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May 8, 2006
Hello,
I have written a small asp.net application, which keeps record of the proposals coming from the branch offices of a bank in a tableCREATEd as a TABLE Proposals ( ID smallint identity(7,1), BranchID char(5), Proposal_Date datetime )
This app also calculates the total number of proposals coming from a specific branch in a given date bySELECTing COUNT(BranchID) FROM Proposals WHERE BranchID=@prmBranchID AND Proposal_Date=@prmDateand prints them in a table (my target table).
This target table has as many rows as the result of the "SELECT COUNT( DISTINCT Proposal_Date ) FROM Proposals"and excluding the first column which displays those DISTINCT Proposal_Dates, it also has as many columns as the result of the"SELECT DISTINCT BranchID FROM Proposals". This target table converts the DateTime values ToShortDateString so that we are able to see comfortably which branch office has sent how many proposals in a given day.
So far so good, and everything works fine except one thing:
Certain DateTime values in the Proposals table which are of the same day but of different hours (for ex: 11.11.2005 08:30:45 and11.11.2005 10:45:30) cause some trouble in the target table, where "SELECT COUNT( DISTINCT Proposal_Date ) FROM Proposals" is executed, because (as you might already guess) it displays two identical dates in ShortDateString form, and this doesn't make much sense (i.e. it causes redundant rows)
What I need to do is to get a result like (in a neat fashion :)
"SELECT COUNT( DISTINCT Proposal_Date ) <<DISTINCT ONLY IN THE DAYS AND NOT IN HOURS OR MINUTES OR SECONDS>> FROM Proposals"
So, how to do it in a suitable way?
Thanks in advance.
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Mar 29, 2007
suppose i have aDataset with 11 rows. field1 with 5 rows of aaa, 6 rows of "bbb"
I want's some thing like
field1 rowcount
aaa 5
bbb 6
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Jan 9, 2015
Okay, I've been working on this for a couple of hours with no success. I'm trying to find the number of telephone numbers that are associated with multiple students at different school sites. I've created a temp table that lists all phone numbers that are associated with more than one student. I'm now trying to query that table and count the number of telephone numbers that are associated with more than one site. Essentially, I'm looking for parent/guardians that have students at different sites.
Here's an example of what I'm hoping to accomplish:
*In this example, I'm just trying to get a count of the different/distinct school sites associated with each number. If I can, at the same time, limit it to a count of > 1 (essentially excluding parents with students at the same site), even better :)
===================================
Temp table
===================================
SCHOOL | STU_ID | STU_PHONE
101 | 12345 | 111-222-3333
101 | 23456 | 111-222-3333
102 | 34567 | 111-222-3333
101 | 45678 | 999-888-7777
101 | 56789 | 999-888-7777
101 | 67890 | 555-555-5555
102 | 78901 | 555-555-5555
103 | 89012 | 555-555-5555
==================================
Wanted query results
==================================
STU_PHONE | #Students | UNIQUE_SCHOOLS
111-222-3333 | 3 | 2
999-888-7777 | 2 | 1
555-555-5555 | 3 | 3
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Mar 18, 2005
This is probably a very silly question.I started learning ASP.net by following ASP.NET Unleashed. I am stuck where he wants me to open a connection to SQL Server database. I have just downloaded
MSDE. But I dont know where to type this code and how to run it..so as to connect to the database.
<%@ Import Namespace="System.Data.SqlClient" %>
<Script Runat="Server">
Sub Page_Load
Dim conPubs As SqlConnection
conPubs = New SqlConnection( "server=localhost;uid=webuser;pwd=secret;database=pubs" )
conPubs.Open()
End Sub
</Script>
Connection Opened!
Now do i have to change the uid to SA ? (i had to assign one when i downloaded and installed MSDE?
Thanks for the help.
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Nov 16, 2005
Hi all,
am not very experienced in using DTS and really need your help. I have a dts package that i have scheduled to run every day. Here's what i want the package to do:
1. Check whether a value for a certain column in a certain row of a table in my database is 0 or 1. If it is 1, then
2. Run the dts task (which i have created and is working)
In other words, when the package is started, i want to execute a stored procedure or sql task or whatever, and if that returns 1 then i want to continue, if it returns 0 i want to finish the package without running the dts task. I'm sure there's a simple way to do this, but i could use your help...!
Thanks,
Elisabet
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Jul 11, 2007
Hi All,
Can this be done and if so can you give a bullet list of the steps need to accomplish this.
I need to load a bunch of files into a stagging table. Need to loop through the files and load them.
Thanks,
Michael
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Mar 12, 2008
Hi,
what this statement do?
does it add all the values or combine all the values.
REPLACE combine WITH lc_tran + lc_exp + lc_war + ll_boc
Regards
kk
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Feb 19, 2007
I downloaded SQLExpress and Visual Studio Express to my home computer.
I built a simple database, adding data through theSQLexpress admin tool.
I built a web page using MS Studio. I connected to the database and used the webpage for a few days. Then I restarted the computer. Now the web page won't open, and MS Studio won't open the MDF file in the App_Data folder.
I can still see and work in the database through SQL server Express.
The web page and the MSStudio attempt to connect to the mdf file both fail with this message:
Cannot open user default database. Login failed.Login failed for user 'KAAAK/Administrator'.
So it seems to be trying to connect as the Windows user.
When I try to modify the connection to connect through a user/password I created in SQL manager, I get a message that the user is not a trusted SQL user.
from web.config:
<connectionStrings>
<add name="ConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|info.mdf;Integrated Security=True;User Instance=True;User ID=Admin;Password=12345" providerName="System.Data.SqlClient"/>
</connectionStrings>
That was changed from the original string created automatically by MS Studio
<connectionStrings>
<add name="stocksConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|stocks.mdf;Integrated Security=True;User Instance=True;" providerName="System.Data.SqlClient"/>
</connectionStrings>
I am sure this is some simple problem, but why would the system refuse to access an mdf file it had already been accessing.?
Thanks, Michael
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Mar 5, 2007
Hi all, having trouble with my first sql communication. I've got hosted service with an SQL database i've populated with a row.
When it gets to the third line the page crashes with an error.
SqlConnection connection = new SqlConnection("Server=mydbserver.com;Database=db198704784;");// +"Integrated Security=True"); SqlCommand cmd = new SqlCommand("SELECT UserName FROM Users",connection); SqlDataReader reader = cmd.ExecuteReader();
is there somewhere i need to put in my username or password? or is this code just wrong
Many thanks burnside.
-- Edited by longhorn2005
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Jun 8, 2007
not sure why I am having trouble here but I am using the following WHERE clause expecting to find all rows where any one of the the three keywords are present.
....WHERE Company.L_Keywords LIKE '%metal%' AND Company.L_Keywords LIKE '%tile%' AND Company.L_Keywords LIKE '%ceramic%'
however it appears to finding only the rows where all three words are present in the L_Keywords field
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Jul 25, 2007
This is a very simple question. How would a select satement be formated in the following example.
SELECT Grade, Student_ID, First_Name, Last_Name FROM Scores WHERE (This is where I'm stuck and I know this is not the right formatting although I wish it were because it would make my life a little bit easier.) Student_ID = 115485, 115856, 568547, 965864, etc...
I may have up to 100 specific student ids to put in this one statement. I know I can use the "WHERE Student_ID = 115485 OR Student_ID = 115856, OR Student_ID = 568547" but that would be alot of waste. Seems like there should be an easier way than using the "OR Student_ID =" for every entry.
Can someone explain another way I can do this. Thanks in advance.
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Jan 28, 2008
Hey, I have a pretty simple question.My query is throwing an error saying "Invalid column name 'subject'."The problem is that subject is a custom column I've made, well just look at the sql:SELECT a.ArticleID, subject=ISNULL((select subject from subjects),'') where subject='some subject'
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May 15, 2001
I have already created package which loads a text file to database using the dts wizard in Enterprise Manager.How do I execute that package using visual basic?Please provide the Code!!!Thanks
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Apr 25, 2000
Hello,
I've just migrated my access database from access2000 to sql7.0. The wizard told me there was no problem. But a simple question:
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Thanks in advance!
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Dec 6, 2004
Hi there.
I am trying to use MDX code to create a measure in ProClarity. Please help!!
A store can be one of a number of ‘Brands’. The MDX segment below gives me the Sales Value of a selected item, but for Store Brand 'Brand1' only. This works fine - but how do I add a brand? That is, how do I see the combined Sales Value for the selected item for 'Brand1' and 'Brand2'?
([Store Brand].[Brand1],[Measures].[Sales Value],[Item].CurrentMember)
B
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Sep 15, 2005
Hoping someone could me with an ongoing indexing question that I have.
On my site, we have over the past 5 years developed what is emerging as a fairly complicated dbase structure, as features have been added to my site and relations have increased between different database tables, there has been a need to index fields in different ways, and in some instances field indexing has overlapped. For example we may have a table that has 5 fields (field1,field2,field3,field4,field5). A need to index field1 is requried because of a query that reads:
SELECT * From Table1 where field1=XXXXX
Additionally there may be a need to for another query that reads:
SELECT * From Table1 where field2=XXXXX
In this instance an index is placed on field2....
But, for example when there is the following query:
SELECT * From Table1 where field1=XXXXX and field2 = XXXXX
Is it necessary to set a new index on: field1,field2 ???
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On a second related question:
In the event that two tables are joined on a common field.
e.g. Select * from Table1,Table2 where Table1.field1=Table2.field1
Is it necessary to index both of these fields in tables: Table1 and Table2 ?
Hope someone can help, as we are looking to improve the efficiency of our tables as they continue to grow.
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Jan 19, 1999
I need help.
160821A network error was encountered while sending results to the front end. Check the SQL Server errorlog for more information.
I need help.
Our SQL Server is crashing. The Database is still recovering. I can not kill any Process when the Server crashed. I shoot down and restarted the server. Nothing to do. I can not access to the database. It is recovering. How long? I do not know. What can be the reason of the recovering? Nor the event log of Windows NT or the log files of the SQL SERVER can help me.
Here is a part of the log file
23216Arithmetic overflow error for type %s, value = %f.
10915There are more columns in the INSERT statement than values specified in the VALUES clause. The number of values in the VALUES clause must match the number of columns specified in the INSERT statement.
99/01/19 01:14:25.69 spid25 bufwait: timeout, BUF_IO, bp 0x1bba600, pg 0x11b50, stat 0x801000/0x6, obj 0x23494814, bpss 0x124a2a0
99/01/19 01:14:27.15 ods Error : 17824, Severity: 10, State: 0
99/01/19 01:14:27.15 ods Unable to write to ListenOn connection '.pipesqlquery', loginname 'sa', hostname 'myserver'.
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Oct 22, 2004
Anyone know any good Visual Basic .NET STep By Step books for an almost beginner.
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Jan 15, 2004
I have many views and views on these views. Is there anyone out there who might have a suggestion as to how I can keep them straight so that I won't lose track of what I made them for? I am starting to not remember why I made some, so I have to go back and try and remember. Any suggestion would be appreciated.
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May 5, 2004
Hi
A quick question:Can we disbale sa account in sql server 2000?
Rgds
Wilson
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May 5, 2004
Hi
How can we audit sysadmin accounts in SQL server?
Rgds
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May 10, 2004
I have a new pc with xp on it,I have been coping data,files,projects,etc from my old pc onto my new over the network.
If I open Query Analyzer my databasese are there and it is all fine,but if I open ODBC I have no databases under System DSN.
How do I go about that,I have many databases and tables in it,is there a way I can refresh it or something,it would have to be something simple,right???
Thanks
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Aug 25, 2006
Hi, can somebody help me with some verification SQL commands that I need to run on an Oracle database?
In the Oracle table 'FEE', if the 'FEETYPE' column has a value of '3' for a record, then the 'PERCENTAMOUNT' column needs to be not null for that row - can somebody put this into a command for me so I can make lots like it?
another one I have is in the 'FEE' table, if the 'FEETYPE' column has a value of '1', the 'PERIOD' column needs to always have a value of '3' for that row - is there a command that can check the records that do/do not have this information?
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Jun 12, 2007
I was just looking for opinions on the best place to pick up SQL skills. Community college course? Online courses? Grad school? I've finished undergrad, if that helps anyone have an idea of my current situation.
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Jun 21, 2007
Hi,
I have only been working with SQL for short time. My question is probably a basic one but I would appreciate the assistance!
The scenario is I have two different tables AVCfids (on ACC database)& AVCfids (on ACC.archive database). I am trying to write a command in SQL server agent (jobs) to transfer the data on a daily basis from AVCfids to ACC.archives. The script I have created but is not working is:
Database: ACC_archives
Select * into avcfids
from server.acc.dbo.avcfids
Any feedback would be welcomed.
Regards Jeff
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Sep 21, 2007
I have a basic query select * From and has a column RecordDate I do I check just records for the last 6 months.
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Oct 9, 2007
Hi,
I am totally new to sql server and have got a few doubts.I couldnt find it in earlier posts.Sorry if it is a repetition
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*How to create a similar copy of a table by using AS..does this work in sql server 2000?(tried but showing error)
*can we modify the column properties(like ensuring NOT NULL) after the table is created?
Thanks in advance
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Nov 20, 2007
I want to count the rows in two tables and then give a percentage as a result.
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