Hello everyone...
i am new to Structured Query Language. I am learning it for the past 6 months form a book by myself. I don't have a teacher available to me. Now when i have finished that with all of the exercises completed. i want to make sure what i've learned is i've really learned it. the problem is that there is no such organization here that i join and have some hand on practical. So now i am asking u guys to help me. Tell me some way so that i make sure of whatever knowledge i have about SQL.
Hi... I'm reading the MS Press 70-442 Self-Paced Training kit, and I'm having problems with this example. I'd like help getting it to work correctly, or understand why it is isn't working the way I planned.
On page 67, the lab is about the APPLY operator (CROSS APPLY and OUTER APPLY). I first have to input a sample table-valued function into the AdventureWorks database:
Code Block CREATE FUNCTION fnGetAvgCost(@ProdID int) RETURNS @RetTable TABLE (AvgCost money) AS BEGIN WITH Product(stdcost) AS ( SELECT avg(standardcost) as AvgCost FROM Production.ProductCostHistory WHERE ProductID = @ProdID ) INSERT INTO @RetTable SELECT * FROM Product RETURN END
and then run a sample T-SQL statement
Code Block SELECT p.Name, p.ProductNumber, Convert(varchar, cost.AvgCost,1) AS 'Average Cost' FROM Production.Product p CROSS APPLY fnGetAvgCost(p.ProductID) AS cost WHERE cost.AvgCost IS NOT NULL ORDER BY cost.AvgCost desc
My problem is with the WHERE clause... According to page 56, CROSS APPLY returns only rows from the outer table that produces a result set, so why do I need to explicitly filter NULL values?
When I remove the WHERE clause, the query retrieves lots of NULL AvgCost values.
Again, according to page 56, it is the OUTER APPLY that returns all rows that return a result set and will include NULL values in the columns that are returned from the table-valued function.
So, in short, I don't see the difference between CROSS APPLY and OUTER APPLY, using this example, when I remove the WHERE clause?
(Please refrain from introducing another example into this question.)
I am loosing my mind on this one. I select info from a database. I then take that selected info, and select info from another table based on that. Straight forward. The CompanyKey attached to my username is 7 which displays in the ReaderResults.Text. I the following line: selectSQL2 = "SELECT * FROM Company WHERE companyKey = ('" + CompanyKey + "')"
I can change it to:
selectSQL2 = "SELECT * FROM Company_Membership WHERE companyKey = 7 "
and it works. I have no idea what is going on. Dissapearing string? Here is the code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 'Database ConnectionDim con As New SqlConnection("Data Source = .SQLExpress;integrated security=true;attachdbfilename=|DataDirectory|ASPNETDB.mdf;user instance=true") 'Job1 InfoDim currentUserID currentUserID = Context.User.Identity.Name.ToString() Label1.Text = currentUserID Dim selectSQL1 As String selectSQL1 = "SELECT companyKey FROM Company WHERE UserID = ('" + currentUserID + "')"Dim cmd1 As New SqlCommand(selectSQL1, con) Dim reader As SqlDataReaderDim CompanyKey 'Job2 Info Dim selectSQL2 As String selectSQL2 = "SELECT * FROM Company WHERE companyKey = ('" + CompanyKey + "')"Dim cmd2 As New SqlCommand(selectSQL2, con) 'Job1 Select Try con.Open() reader = cmd1.ExecuteReader()Do While reader.Read() CompanyKey = reader("CompanyKey").ToString() Loop reader.Close()Catch err As Exception ReaderError.Text = "Error selecting record." ReaderError.Text &= err.Message Finally ReaderResults.Text = CompanyKey con.Close() End Try 'Job2 Select Try con.Open() reader = cmd2.ExecuteReader() GridView1.DataSource = reader GridView1.DataBind() reader.Close()Catch err As Exception ReaderError.Text = "Error selecting record." ReaderError.Text &= err.Message Finally ReaderResults.Text = CompanyKey con.Close() End Try
I do a lot of hiring for my company and a lot of the people I interviewsay that they are experts at SQL queries, but when I give them somethingsimple just beyond the typical SELECT type of queries, they choke.For example I have a table that looks like this:PK_ID - primary keyPARENT_ID - a FK to another row in the same tableThis essentially is a tree structure. I will ask interviewees to writea query that will return all the rows that have 2 direct children. Noone knows how to do this.I don't get it. I have done queries which boggle the mind and they arefar more complex than this.Am I asking too much?--* Don VaillancourtDirector of Software Development**WEB IMPACT INC.*phone: 416-815-2000 ext. 245fax: 416-815-2001email: Join Bytes! <mailto:donv@webimpact.com>web: http://www.web-impact.com/ This email message is intended only for the addressee(s)and contains information that may be confidential and/orcopyright. If you are not the intended recipient pleasenotify the sender by reply email and immediately deletethis email. Use, disclosure or reproduction of this emailby anyone other than the intended recipient(s) is strictlyprohibited. No representation is made that this email orany attachments are free of viruses. Virus scanning isrecommended and is the responsibility of the recipient./
My company asked me to do a tech interview on a potential contractor for a three month assignment writing SQL Server stored procedures.
I have some things I can ask him to test his qualifications, such as cross-tab query design, UDF usage, running total queries, select first 'N' queries, Primary Keys vs Clustered Indexes, etc...
I was curious what questions other people might ask in order to assess a person's skill. Remember that this is SQL programming only, not admin stuff, and I want to ask questions with a range of difficulty from easy to head-cracker.
I am having a puzzling problem with a DTS package in SQL 2000 that uses a combination of "Execute Process Tasks" and "ActiveX Script Tasks." The issue occurs with one of (the second) the ActiveX Script Task. The script invokes a COM object that was written in C#. This COM object connects to the database and writes a record set and then calls a stored procedure. When I run this step individually, everything works fine. When I run it as part of the package, the record set is being written but the stored procedure is not invoked (SQL Profile confirms this).
I haven't really begun a serious attempt to troubleshoot the problem, though I have played around with the Transactions and OLE DB properties of the DTS Package.
Any suggestions as to why the behavior might be different, or some straightforward tips on troubleshooting would be appreciated. I have access to the COM component source.
I dont know where to put this thread, I just wanna ask a question..actually what is happen when subscription synchronized the publications among IIS process.. (SQLMobile)
I don't have any knowledge about SQL Server at all... I wanna know:
1. What is SQL Server? 2. Have SQL Server something to do with databases and Microsoft Access to do? 3. What is the link between Visual C++ Express Edition and SQL Server Express Edition? 4. Where on the web can I learn (tutorials) how to use SQL Server Express Edition?
Dear Friends, please suggest me the best book to gain sound knowledge in DBA concepts as well as writing in sub queries, complex queries as well as inner queries.
I've been working as a .NET developer for many years. However, my educational background isn't in IT at all, so I occasionally find that there are big gaps in my knowledge when I'm called on to do certain things.
My current role is the first one I've had where the efficiency of my database calls has needed to be top-notch. Most of my previous posts have been in building intranet functionality for medium-sized companies so it's just not been an issue and my fairly basic level of SQL knowledge has been enough to get me by.
However, I'm increasingly finding I'm needing to look stuff up, ask for help and so forth and I'm not at all sure that what I'm putting out is up to scratch. I have three main areas of concern:
1) The developers here seem to like doing a lot of the "work" of data sorting and manipulation in SQL whereas I'd previously have just grabbed the whole table and done the manipulation in .NET. I'm finding building my complex queries is just doing my head in - I'm just not used to "thinking" in the way that SQL requires which seems very different from procedural programming.
2) A lot gets said about properly indexing tables for maximum efficiency. I know what an index is and vaguely what it does, but the means of applying them to ensure the best performance is pretty much beyond me.
3) In the same manner I'm now having to worry a lot more about performance issues in my database design. I now the five normal forms and so on, but is there anything else here I need to do to maximise performance?
What I'm asking, really, is whether anyone can recommend a good source for SQL knowledge (book, site, whatever) that specifically focuses on my first problem - it'll teach me the proper way to structure my queries and think about them properly so that they don't look so damn impenetrable. It then needs to go on and address my other issues.
Greetings,I have to admit that I'm still a beginner in the database field, but I'mactively studying, and this is why I will be utterly grateful for theproper, accurate, and wise guidance to the right direction or specificpaths of database studies.I simply want to make my first major database project a "personalknowledge database" or a "personal encyclopedia", so to speak. By this Imean that I want to gather diverse, multi-format bits of knowledge intoa single database divided into major categories, sub-categories, and soon. For example, I want to scan collected articles from newspapers &magazine and save them as images, type hand-written notes into thecomputer and save them as MS Word or Text files, save audio files withsearchable keywords, even save searchable MS OneNote audio & text files,all into directories & sub-directories. Then I want to be able to searchall these files for specific words or subjects; sort them according todate, subject, etc; update, add to or append, edit, or even cut & paste(within) any of those records in the database, which rely on easilycustomizable formats like text & images (in contrast with audio files orOneNote files, for example).I also want to prevent wasting time in the future, by avoidingrepetitive, same-keywords typing for every non-text new entry, like animage or audio file, by having a customizable keyword list open (byright clicking for example), where one could mark all the relevantkeywords for the picture or audio file. Also have a short descriptionfor each one of those entries when needed. And I want to be able to addslick, good-looking graphics to the interface of the database and theforms of the records.Basically, my priorities include: saving time filling the database withknowledge, quickly & accurately finding the future targets of anysearch, presenting the search results in a highly comprehensible &organized form, and a good looking interface & forms for every entry,which are pleasing to the eye and encouraging to study.I already use graphics applications for the "looks" part. So my questionis: what are the technologies or applications that I should learn byheart and use in order to design such a database in the best way? WouldMS Access alone do it all for me? Or should I learn other technologies?I'll be grateful for anyone taking the time to help. Thanks.Sincerely,Yasso"Claiming that God does not exist because there are people suffering anddying is like saying that barbers do not exist because there are peoplewith long hair! Truth is: they suffer because they did not find God ordo not go to Him, just like the others did not find a barber or do notgo to one."*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
Hello, I've been trying for a couple of days now with the following problem in SQL Ive a table called tblRresults that has the following Date - just a regular date OfficeLocation - just a unique id such as a zip code SampleType - contains things like wall, floor, beam SampleResult - "Detected" or "NotDetected" When populated the table can look like 12/12/05 99505 Wall Detected 12/12/05 99505 Wall NotDetected 10/04/05 99211 Beam Detected 10/04/05 99211 Beam Detected 10/04/05 99111 Floor NotDetected 10/04/05 99111 Floor NotDetected What I want is (I guess) a crosstab query that produces the following Date Location SampleType CountDetected CountNotDetected 12/12/05 99505 Wall 1 1 10/04/05 99211 Beam 2 0 (or null would be ok) 10/04/05 99111 Floor 0 2 Any help gratefully accepted, this has been driving me mental! thanks
I am using SETROWCOUNT 10 in my stored procedure. At end of thi sp I use SETROWCOUNT 0. Will all other sp's that are executing at the same time as the above sp, get affected by the above SETROWCOUNT statement?
I have a table called Courses with columns "courseCode" "courseName" and "TeacherName"Im passing in a value @prefixText ...I have the following...Select courseModuleCode from courses Where courseModuleCode like @prefixTextwhat I actually want to do is return one list, i.e. one column that will do the same for "courseName" and "TeacherName" aswell based on what the @prefix tag is...so i will end up with one column that may contains some or all of the following courseModuleCode, courseName, TeacherName. Im basically implementing a search on this table and want the users to search by any of the column nameshope this makes sense.
I am new to DTS. In ExecuteSQLTask: want the original sql statement of <<backup database databaeABC to backup_databaseABC with init>> to be
backup database ? to 'backup_' + ? with init
But it looks the parameter could not place a globalVariable to it and parse it with error. One alternate way probably need to create a proc to pass a parm to it....
Also, how could pass a globalVariable to a FTP task?
We have a Pub, Dist and Sub Server all running under SP2 with worm update and are looking to apply SP3a . Replication is transactional with heavy usage . What is the best sequence to apply SP3
can it be spread out in 3 weekends or has to be done all together ?
I want to apply lock on a row, where by when another application is trying to access the locked row the application will automatically move to the next row instead of waiting for the locked row
SQL Server 2000 Original Release 8.00.194 RTM Database Components SP1 or Desktop Engine SP1 8.00.384 SP1 Database Components SP2 or Desktop Engine SP2 8.00.534 SP2 Database Components SP3 or SP3a, or Desktop Engine SP3 or SP3a 8.00.760 SP3
This would imply that after installing sp3a and restarting, the version reported should now be 8.00.760. However, it still shows 8.00.194. So it appears to have not really installed, althought the sp3a installation ran without incident. So, how can I get the sp3a to not just act like it installed, but actually get it to install? Also, I have shut down all mssql services and rebooted, applied patch, and rebooted again. Doesn't help. Also, if it is really installing, is there another way to tell?
Anyway, I really need to be able to install sp3a to see if it fixes another problem I'm having. Unfortunetly, since I can't even tell if the sp3a is installing, I can't tell if it really doesn't help or not. Thanks.
We would like to apply a hotfix to solve the issue that brought our server down. The hotfix we are trying to apply is in Build 3175. But the latest Cumulative Update 3 Package is Build 3186. Should we apply 3175? Or we can go for the latest build 3186? Which is recommended?
I want to show top selling items for each store. Sample SQL Query is "SELECT TOP n ItemNumber FROM Inventory Group By Store" n - is the dynamic value. I am accepting this n parameter from the user. If the user is giving 5 for n then, I want to show top 5 selling items for each store. It will be greatfull, If anybodies giving me an idea of how to do this?.
HI, I am going to make a big web application. so im going to use sql connection with class for example i have 100 web pages and i will make a slq connection in class.vb Class1.vb(see the below code) Imports System.Data Imports System.Data.SqlClient Imports Microsoft.VisualBasicPublic Class Class1 Private conn As New SqlConnection("Data Source=DANISHSQLEXPRESS;Initial Catalog=ARBASHHR.MDF;Integrated Security=True")Private cmd As New SqlCommand() Private da As New SqlDataAdapter(cmd) End Class default.aspx(here is asp.net page i want to use the sql connection from that class.) but this below page saying that Name "cmd" is not declared and connection Try cmd.Connection = conn conn.Open()Dim ds As New DataSet cmd.CommandText = "SELECT * FROM Users where (UserName = N'" & TextBox1.Text & "')" 'And (Password = N '" & TextBox2.Text & "')"da.Fill(ds, "data") conn.Close() For Each dt As DataTable In ds.Tables For Each dr As DataRow In dt.RowsTextBox3.Text = dr.Item("Password") Next drNext dt If TextBox2.Text = TextBox3.Text ThenResponse.Redirect("Welcome.aspx") Else Label3.Text = "Invalid Username/password" End IfCatch ex As Exception ' MsgBox(ex.Message) '("Error Loading Information From Database..", MsgBoxStyle.Critical, "Error") End Try End Sub please let me know where im doing mistake..... Thank in Advance
Is anyone else having trouble with the Apply button under the permissions tab? I can change permissions, click apply, the changes are shown, but when I access the database, the changes arn't made. If I close the permissions windows and re open the changes arn't made.
Will SP1 fix this?(it's not listed in the fix text file)
Why am I getting a different numbers of distinct ids in those queries?
USE AdventureWorks go Declare @myXml as xml set @myXml = ' <lol>omg</lol> <lol>rofl</lol> ';
select locations.*, T.c.value('.','nvarchar(max)') from ( select newid() as Id from Production.ProductModel where ProductModelID in (7, 8) ) as locations cross apply @myXml.nodes('(/lol)') T(c);
select mytable.* , T.c.value('.','nvarchar(max)') from ( select newid() as Id union select newid() ) as mytable cross apply @myXml.nodes('(/lol)') T(c);
Hi all!I want to create a constraint that uses data from other tables,specifically i want to make sure that a varchar has exactly the lengthspecified in an integer-column in a table that I pointed out with aforeign key.I would like this to be solved something like this:create table string_size_limits(row_id INTEGER PRIMARY KEYstring_size INTEGER)create table strings(string_size_limit_row_id INTEGERREFERENCES string_size_limits(row_id)string varcher(50)CONSTRAINT check_string_size CHECK ???)Is it possible to solve this problem without SP using above model?Is it possible to solve this problem with SP using above model?Must the above problem be solved using triggers?Any help appreciated
