Could Anybody Explain To Me Why Sqldatadpater Does Not Allow Subqueries?
Aug 17, 2007
Dear experts,
Recently i got an error msg looks like this: you cannot use subqueries within a sqldatadpter except the subquery is introduced with EXISTS.
Well, actually i was using IN.
I know I can revise my query sting to use INNER JOIN or such stuff just to remove the nested queries. But i'm realllllly curious why it's not allowed??
why do the following return the same datasets? select * from myTable where myData = '' select * from myTable where myData = ' ' in the first I'm specifically searching empty strings, in the second a sequence of five spaces. Yet both return any and all white character matches? Is this a "feature" of SQL... P.S. I'm using T-SQL
Table #1 SELECT EID, DATEPART(wk,[Date]) AS Week, MAX([Date]) AS WeekEnding FROM Employee_Hours WHERE ([Date] Between '1/1/04' AND '12/31/04') GROUP BY EID, DATEPART(wk,[Date]) HAVING MAX([Date]) = '1/24/04' --Pay period
Table #2 SELECT EID, DisplayName FROM Employee WHERE (Active=1)
I tried subqueries and temp tables but can't get the results I need. The first query will return the employees who entered their time for the given pay period.
I have the following sql statement: INSERT INTO prg_lvl VALUES ( 'Data Recovery', 'Data Recovery', 7, 'ENG', 0, 16, 'Menu=w_data_recovery_stk;', ( select max(menu_id) + 1 from prg_lvl ), 'K'); that works for Sybase and I wanna make it works for SQL Server.
The problem is the use ot the subquery (select max(menu_id) + 1 from prg_lvl).
Could I use subqueries in SQL Server in general or is there is any other method to overcome this problem
Until a few days ago we didn't even know SPID 1 existed. These are different guys, using old version of Crystal passing crappy queries.
Here's the scenario SPID 1 is running (inefficient select) SPID 2 is waiting 30 minutes pass and SPID 2 is still waiting PAGEIOLATCH_SH SPID 3 fires off
Now SPID 2 is blocking SPID 3, but SPID 2 is still waiting for SPID 1
Finally when SPID 1 finishes, everything catches up. But it appears that there is a period of at least 45 minutes when all SPID's are just sleeping.
My questions: 1. If SPID 1 is just running an inefficient select query, why is it holding up SPID 2 (Which reads and inserts). SPID 1 should have a shared lock on table, this would prevent SPID 2 from insert/update? 2. Is there any steps I can take to give SPID 2 precendence? or is it first come first serve?
I am very new to SQL Server, working with it in class. I am trying to do procedures involving subqueries using the Northwind database, and am having a rough time.
For instance, I have the following code, which lists all orders for the month of November, 1996:
SELECT Customers.CustomerID, Customers.CompanyName, CAST(Orders.OrderDate AS CHAR (11) )AS OrderDate FROM Customers, Orders WHERE Customers.CustomerID = Orders.CustomerID AND OrderDate BETWEEN '11/1/1996' AND '11/30/1996' ;
I have been asked to do the same thing, but using a subquery. I came up with the following:
SELECT CustomerID, CompanyName FROM Customers a WHERE EXISTS (SELECT OrderDate FROM Orders b WHERE a.CustomerID = b.CustomerID AND OrderDate BETWEEN '11/1/1996' AND '11/30/1996' ) ;
However, it does not list the Order Date, as I want it to, and the information is not correct (it is missing a few orders from November '97 that should show up. Can someone tell me what I am doing incorrectly?
Please note that I do not need anyone to give me the code, but simply give me an idea of what I am doing incorrectly, or let me know how it can be done, so that I may do it. =-)
Hi all,I've seen mention that you can use nested subqueries down to as manylevels as you like but whenever I run the following:select * from table1where tab1ID in(select tab1ID from table2 where tab2ID in(select tab2ID from Table3 where Tab3ID=N))I get the error "incorrect syntax near the keyword 'where'"Can anyone confirm that sub-subqueries are possible? If so is thesyntax I'm using correct?I'm running SQL 2000 through a Delphi 5 app.RegardsJon
Hello,I run the following query on a database (SQL 2005):delete from person where pers_companyid in (select pers_companyid fromcompany where comp_expiry is not null)I wanted to delete all people associated with a company which had anexpiry date. The mistake I made was that the column pers_companyiddoes not exist. It should have been comp_companyid.However, the query ran anyway and deleted all records from my persontable? If I run the subquery on its own then it doesn't run as thecolumn is missing.Shouldn't I have got an error running this query?Thanks,David
Guys,Got this query...---------------------------SELECT TOP 5 Tbl_admin_hotels.HotelName,(SELECT COUNT(Tbl_marketing_history.HotelID)FROM Tbl_marketing_historyWHERE Tbl_marketing_history.HotelID = Tbl_admin_hotels.HotelID)AS CountTotal,(SELECT MAX(DateSent)FROM Tbl_marketing_historyWHERE Tbl_marketing_history.HotelID = Tbl_admin_hotels.HotelID)AS LastSentFROM Tbl_admin_hotelsWHERE NOT Tbl_admin_hotels.HotelID = 99ORDER BY CountTotal DESC---------------------------Within the table Tbl_marketing_history there is also a 'Subject' column thatI require, the row to grab this Subject column from should relate to the rowI'm selecting in the SubQuery to grab 'DateSent'.I've tried and tried to grab multiple columns but failed miserably? Cananyone help pleaseeee!Cheers, Ash
In this stored procedure, I want to grab all the information for Sales Representatives that made less then 6 visits. I have done that in the subquery. But I also want to be able to display their visits by Dates where any number of visits was made. Meaning, i want to be able to show Everyday where a visit was made, but i only want the records that are less then 6 visits. So I want nulls to show up for the dates where no visits were made. So I can track the people that didnt make visits, on days other made visits (which means they should have visits too)
So basically my report looks like this: 09-10-2007 09-11-2007 09-14-2007 Tom Smith 1 3 4 Janice Cooper 3 5 5 Troy Slater 5 4 2 Kelly Short 4 4 4
When i want it to look like this:
09-10-2007 09-11-2007 09-12-2007 09-13-2007 09-14-2007 Tom Smith 1 3 null null 4 Janice Cooper 3 5 null null 5 Troy Slater 5 4 null null 2 Kelly Short 4 4 null null 4
Its an exception report, so i want to show what was not done , on days that are supposed to have things done, i cant show this, if dates are not displayed before there were no visits less then 6. I want to display all relevant dates, where any number of visits was mad. But only show the visits that were less then 6.
Here's my stored procedure that already has the less then 6 visits showing. But doesnt always show the dates. What should i do?
Hey everyone, I'm running into an issue where I have a select statement that retrieves all employee records from a employee table. In this statement I'm displaying first and last name, titlte and the employees manager id(which is the employees id). What I want is a query that instead of displaying the manager's id, display the manager's name. The query that I'm using below doesn't work. I was hoping that someone could help me out: SELECT LastName, FirstName, Title, Extension, (SELECT FirstName, LastName FROM Employees WHERE (ReportsTo = EmployeeID)) AS Reports FROM Employees
Here's the data that I'm using: LastName, First Name Title Extension Reprots To
Davolio Nancy Sales Representative 5467 13
Fuller Andrew Vice President, Sales 3457 0
Leverling Janet Sales Representative 3355 12
When I run this query I get a error saying "Only one expression can be specified in the select list when the subquery is not introduced with Exists"
So I already no this can't be done... but I need a suitable alternative (if one exists) so I don't have to competely re-write this already too huge query. Anyways, in my select I have something like this: sum( case when code in (1,2,3,4) then 0 else 1 end ) as total which has now increase from four static values to a more dynamic format, that being a table with 47 values which may shrink or grow over time. Attempting the following fails: sum( case when code in (select code_id from ExcludedCodes) then 0 else 1 end ) as total because apparently you can't use selects or aggregates within an aggregate. So any ideas on how I can get this working... is there no Array or List type variable I could just substitute in? I've already tried using a Table Variable, but that failed as well. Please keep in mind, this is one line of a very large select containing many other fields and aggregates (on a fair amount of joins) which is used in at least four differerent reporting queries. If there is no quick and easy replacement trick I can do just let me know so I can start re-writing all of them (which is seriously going to make my head hurt).
I found this on http://msdn2.microsoft.com/en-us/library/86773566.aspx which i am hoping may be able to resolve my problem but I am not sure I actually understand it. Where it shows // Start a local transaction. transaction = connection.BeginTransaction("SampleTransaction"); is the "SampleTransaction" nothing more then just a name of the transaction that is being created through this code or is it actually pointing to something?I believe that I understand the rest. Oh and in case you have a better way of doing what I am needing here is the SQL Query that is pulling info for me to display on a pageSELECT p.product_ID, p.class_ID, p.category_ID, p.product_name, p.product_desc, p.product_image, p.product_dimension, p.product_o1, p.product_o2, p.product_o3, p.product_ac, p.product_ph, p.product_photo, pcl.class_name, pca.category_nameFROM products AS p INNER JOIN productClass AS pcl ON p.class_ID = pcl.class_ID INNER JOIN productCategories AS pca ON p.category_ID = pca.category_IDBasically I am using the transaction to perform multiple updates seeing as how I will need to update multiple tables. private static void ExecuteSqlTransaction(string connectionString){ using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); SqlCommand command = connection.CreateCommand(); SqlTransaction transaction; // Start a local transaction. transaction = connection.BeginTransaction("SampleTransaction"); // Must assign both transaction object and connection // to Command object for a pending local transaction command.Connection = connection; command.Transaction = transaction; try { command.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"; command.ExecuteNonQuery(); command.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"; command.ExecuteNonQuery(); // Attempt to commit the transaction. transaction.Commit(); Console.WriteLine("Both records are written to database."); } catch (Exception ex) { Console.WriteLine("Commit Exception Type: {0}", ex.GetType()); Console.WriteLine(" Message: {0}", ex.Message); // Attempt to roll back the transaction. try { transaction.Rollback(); } catch (Exception ex2) { // This catch block will handle any errors that may have occurred // on the server that would cause the rollback to fail, such as // a closed connection. Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType()); Console.WriteLine(" Message: {0}", ex2.Message); } } }}
I am new to triggers.I am unsure why on the SELECT statement the ROLLBACK is enforced. I thought this would be only for when an attempt is made to insert the data. Also what is the pupose of IF @counter = 1 When does this counter change value? USE Northwind GO CREATE TRIGGER PriceCheck ON [Order Details] FOR INSERT AS DECLARE @counter int SET @counter= @@ROWCOUNT DECLARE @unitprice money DECLARE order_details_insert_cursor CURSOR FOR SELECT Unitprice FROM inserted IF @counter = 1 BEGIN IF(SELECT UnitPrice FROM inserted) > 300 -- If the price entered is greater than 300 BEGIN --print a warning PRINT 'Cannot enter price greater than 300' --Take back the command ROLLBACK TRANSACTION END END ELSE BEGIN OPEN order_details_insert_cursor FETCH NEXT FROM order_details_insert_cursor INTO @unitprice WHILE @@FETCH_STATUS = 0 BEGIN if @unitprice > 300 -- If the price entered is greater than 300 BEGIN --print a warning PRINT 'Cannot enter price greater than 300' --Take back the command ROLLBACK TRANSACTION RETURN --Exit trigger immediately END FETCH NEXT FROM order_details_insert_cursor INTO @unitprice END CLOSE order_details_insert_cursor END DEALLOCATE order_details_insert_cursor
I've got some questions about xp_cmdshell and was hoping someone could explain some things to me. I've written a trigger for a table that uses 'xp_cmdshell' to launch a VB.Net application. The syntax is correct and it "seems" to work but in the way I intended. When the app launches there is no GUI present but when I check the task list I see that the exe has been launched. This intrigued me so I started playing with it in Query Analyzer. When I run the commandexec master.dbo.xp_cmdshell 'C:WINDOWSsystem32otepad.exe'I seen a process for notepad show up on my processes list started by 'system' as opposed to myself and notepad still doesn't open up for me to see. I also noticed that the query executes until I kill that particular process. I'm guessing cause it's waiting on the tranaction to complete. What I want to know though is why can't I see the program when I open like this? Is it because 'system' is the user behind it or is there some extra parameter to throw in the xp_cmdshell?
Hi, I have searched through this forum and haven't found the answer to a problem I am having so I figured I will post it.
My SQL statement:
Select * FROM tblData WHERE LastName= (SELECT tblData.LastName FROM tblData GROUP BY tblData.LastName HAVING (Count(tblData.LastName)>1))"
What I am trying to do: I am trying to make an SQL filter that I can apply to my form in order to only show records with duplicate last names. The sub query returns names that are already in the table. I then compare what is found to be duplicate with the original table in order to just show only the duplicate records. Everything works fine as long as there is only one name thats duplicated.
When there are multiple duplicate names then I run into an error.
When the statement is put into a string and executed in VBA I get this error:
"Run-time error '3021': No current record."
When the statement is put into a query and run against the DB I get this error:
"At most one record can be returned by this subquery"
So yeah, any help would be greatly appreciated. Am I going about this all wrong or am I just forgetting something? Thanks for any help.
Is there some equivalent to MySQL's EXPLAIN function? (or some utility that does the same thing?)
Basically the function takes a query and will return a list of the tables in the query and the number of rows that would need to be checked. It's used to check how well the indexes are set. (If a table returns a very high number, that could be a bottleneck for the query).
I would like to know which of the following query is the fastest:
select * from customers C where exists (select 0 from ORDERS O where C.Name like 'A%' and O.Charged = 1)
select * from customers C where exists (select 0 from ORDERS O where O.Charged = 1) and C.Name like 'A%'
I don't want to use a JOIN clause. I just want to know if there is a difference of efficiency when the condition on C.Name is inside or outside the sub query.
I would like to know which of the following query is the fastest:
select * from customers C where exists (select 0 from ORDERS O where C.Name like 'A%' and O.Charged = 1 and O.Customers_Id = C.Id)
select * from customers C where exists (select 0 from ORDERS O where O.Charged = 1 and O.Customers_Id = C.Id) and C.Name like 'A%'
Because the condition C.Name like 'A%' is inside the sub query, I'm wondering if it will be evaluated for each record of the Orders table. Does anyone know if there is a difference of efficiency when this condition is inside or outside the sub query ?
Hello All,The following script is reproducing the problem assuming you haveNorthwind database on the server.Please note it gives you the error message on line 12.USE tempdbGOsp_addlinkedserver 'Test17'GOsp_setnetname 'Test17', @@SERVERNAMEGOIF EXISTS (SELECT 1 FROM dbo.sysobjects WHERE id =object_id(N'[dbo].[This_works]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)DROP PROCEDURE [dbo].[This_works]GOCREATE PROCEDURE This_works@UseLinkedServer bit = 0-- WITH RECOMPILE -- Does not helpASSET NOCOUNT ONIF @UseLinkedServer = 1 -- Linked ServerBEGINIF EXISTS (SELECT 1 FROM dbo.sysobjects where id =object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY(id, N'IsUserTable')= 1)DROP TABLE dbo.Orders_TMPSELECT * INTO dbo.Orders_TMP FROM Test17.Northwind.dbo.OrdersENDELSE -- LocalBEGINIF EXISTS (SELECT 1 FROM dbo.sysobjects where id =object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY(id, N'IsUserTable')= 1)DROP TABLE dbo.Orders_TMPSELECT * INTO dbo.Orders_TMP FROM Northwind.dbo.OrdersSELECT 1 FROM dbo.Orders_TMP WHERE 1 = 2 -- Why do I need this line?ENDBEGIN TRANSACTIONSelect 'Line 25'SELECT COUNT(*) FROM dbo.Orders_TMPCOMMITgoIF EXISTS (SELECT 1 FROM dbo.sysobjects WHERE id =object_id(N'[dbo].[This_does_not]') and OBJECTPROPERTY(id,N'IsProcedure') = 1)DROP PROCEDURE [dbo].[This_does_not]GOCREATE PROCEDURE This_does_not@UseLinkedServer bit = 0-- WITH RECOMPILE -- Does not helpASSET NOCOUNT ONIF @UseLinkedServer = 1 -- Linked ServerBEGINIF EXISTS (SELECT 1 FROM dbo.sysobjects where id =object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY(id, N'IsUserTable')= 1)DROP TABLE dbo.Orders_TMPSELECT * INTO dbo.Orders_TMP FROM Test17.Northwind.dbo.OrdersENDELSE -- LocalBEGINIF EXISTS (SELECT 1 FROM dbo.sysobjects where id =object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY(id, N'IsUserTable')= 1)DROP TABLE dbo.Orders_TMPSELECT * INTO dbo.Orders_TMP FROM Northwind.dbo.Orders--SELECT 1 FROM dbo.Orders_TMP WHERE 1 = 2 -- Why do I need this line?ENDBEGIN TRANSACTIONSelect 'Line 25'SELECT COUNT(*) FROM dbo.Orders_TMPCOMMITGOPRINT 'This_works'EXECUTE This_works 0PRINT ' 'PRINT 'This_does_not'EXECUTE This_does_not 0Thanks for any help or hint,Igor Raytsin
I have tried this insert comand and it errors out telling me that icannot use subqueries this way. INSERT INTO tblPartLocation(PartLocation, Part)VALUES (999,(SELECT PartID FROM tblParts WHEREPartName = 'test'))how would i insert a value from a query?thanks for any help
Hello.Does someone of you know if is there a 'explain plan' like function in SQLServer (similar to explain plan in Oracle or DB2)If so then how it works, where stores data and how it can be retrieved?Best regardsBagieta=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=dbDeveloper - Multiple databases editorhttp://prominentus.com=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
I need to build a view that has 4+ columns that are "counts" of relationships with other tables.
for example:
Code Snippet select Name, Description, (select count(*) from PetOwner PO where PO.OwnerId = O.Id) as PetCount from O Owner
I need to add a few more counts to this query, but I'm thinking that is a bad idea since the number of joins is going to get out of control if I need more counts.
I've created a view with all the counts and it works fine.
I want to index the view so the counts aren't calculated everytime the query is run, but I can't index if I use a subquery like this.
In the end I want the result set to have these columns.
I have a table with two columns: OID and Cumulative (witch is the same type as OID) Each OID can have one or more Cumulatives.
Example of data: OID Cumulative 167 292 167 294 167 296 168 292 169 302 169 304
The cumulation of each OID don't stop at one cumulation, but can be endless (theoretical). Example: 167->292->590 So the table would have on more row: OID Cumulative 295 505
I would like to represent this strucuture in a tree view and I'm looking for a query that could give me a table with this structure: OID Cumul1 Cumul2 Cuml3 Cuml4 .... Cumuln in the way I can read the row and have as many child nodes as I have values in the columns. The number of columns depends on the row with most cumulations.
How can I do the query? Is there a better way as my table with n columns?
Hi what i like to do is insert in one table 2 value from 2 different row. exp: table1: person id name 1 bob 2 john so id like to make an insert that will result in this table 2: person_knowed idperson1: 1 idperson2: 2 so the wuery should look something like this:
insert into person_knowed(idperson1, idperson2)(select id from personwhere name = 'bob',select id from personwhere name = 'john')); anybody have an idea of how to acheive this?
