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  • Trouble understanding Java map Entry sets

    - by Jake Sellers
    I'm looking at a java hangman game here: https://github.com/leleah/EvilHangman/blob/master/EvilHangman.java The code in particular is this: Iterator<Entry<List<Integer>, Set<String>>> k = partitions.entrySet().iterator(); while (k.hasNext()) { Entry<?, ?> pair = (Entry<?, ?>)k.next(); int sizeOfSet = ((Set<String>)pair.getValue()).size(); if (sizeOfSet > biggestPartitionSize) { biggestPartitionSize = sizeOfSet; } } Now my question. My google foo is weak I guess, I cannot find much on Entry sets other than the java doc itself. Is is just a temporary copy of the map? And I cannot find any info at all on the syntax: Entry<?, ?> Can anyone explain or point me toward an explanation of what is going on with those question marks? Thanks in advanced.

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  • Consolidating values in a junction table

    - by senloe
    I have the following schema: Parcels Segments SegmentsParcels ========= ========== ================= ParcelID SegmentID ParcelID ... Name SegmentID ... id A user of the data wants to consolidate Segments.Names and gave me a list of current Segment.Names mapped to new Segment.Names (all of which currently exist). So now I have this list in a temporary table with the currentID and newID to map to. What I want to do is update the SegmentID in SegmentsParcels based on this map. I could use the statement: update SegmentParcels set segmentID = [newID] from newsegments where segmentID = currentid but this will create some duplicates I have a unique constraint on ParcelID and SegmentID in SegmentParcels. What is the best way to go about this? I considered removing the constraint and then dealing with removing the duplicates (which I did at one point and could probably do again) but I was hoping there was a simpler way.

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  • Association end is not mapped in ADO entity framework

    - by Sean
    I am just starting out with ADO.net Entity Framework I have mapped two tables together and receive the following error: Error 1 Error 11010: Association End 'OperatorAccess' is not mapped. E:\Visual Studio\projects\Brandi II\Brandi II\Hospitals.edmx 390 11 Brandi II Not sure what it is I am doing wrong

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  • use a sql select statement to get parameters for 2nd select statement

    - by diver-d
    Hi there, I am trying to write a sql statement that I have 2 tables Store & StoreTransactions. My first select command looks like SELECT [StoreID],[ParentStoreID] FROM Store Very simple stuff. How do I take the returned StoreID's and use them for my 2nd select statement? SELECT [StoreTransactionID],[TransactionDate],[StoreID] FROM StoreTransactions WHERE StoreID = returned values from the above query Any help would be great!

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  • Foreign Keys Duplicated in DataGridView

    - by John Doe
    I created a Windows Forms Application to which I added a DataGridView and LINQ to SQL Classes from one of my databases. I can successfully bind one of my database's tables to my DataGridView: var dataSource = from c in _db.NetworkedEquipments select c; dataGridView1.DataSource = dataSource; However, the foreign keys get duplicated, that is, the columns appear twice. How can I prevent this?

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  • problem with join SQL Server 2000

    - by eyalb
    I have 3 tables - Items, Props, Items_To_Props i need to return all items that match all properties that i send example items 1 2 3 4 props T1 T2 T3 items_to_props 1 T1 1 T2 1 T3 2 T1 3 T1 when i send T1,T2 i need to get only item 1

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  • how to generate the "create table" sql statement for an existing table in postgreSQL

    - by Raja
    I have a table created long ago in postgreSQL. Now i want to look at the sql statement used to create it but cannot figure it out. Also when i do the \dS+ tablename it says table not found, but \dt+ tablename is working fine. The \dS+ lists all the table names owned by the root postgres user and doesn't show up tables that i created with my user account. Any help is greatly appreciated. Thanks

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  • How to remove duplicate records in a table?

    - by Mason Wheeler
    I've got a table in a testing DB that someone apparently got a little too trigger-happy on when running INSERT scripts to set it up. The schema looks like this: ID UNIQUEIDENTIFIER TYPE_INT SMALLINT SYSTEM_VALUE SMALLINT NAME VARCHAR MAPPED_VALUE VARCHAR It's supposed to have a few dozen rows. It has about 200,000, most of which are duplicates in which TYPE_INT, SYSTEM_VALUE, NAME and MAPPED_VALUE are all identical and ID is not. Now, I could probably make a script to clean this up that creates a temporary table in memory, uses INSERT .. SELECT DISTINCT to grab all the unique values, TRUNCATE the original table and then copy everything back. But is there a simpler way to do it, like a DELETE query with something special in the WHERE clause?

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  • Inheritance - initialization problem

    - by dumbquestion
    I have a c++ class derived from a base class in a framework. The derived class doesn't have any data members because I need it to be freely convertible into a base class and back - the framework is responsible for loading and saving the objects and I can't change it. My derived class just has functions for accessing the data. But there are a couple of places where I need to store some temporary local variables to speed up access to data in the base class. mydata* MyClass::getData() { if ( !m_mydata ) { // set to NULL in the constructor m_mydata = some_long_and complex_operation_to_get_the_data_in_the_base() } return m_mydata; } The problem is if I just access the object by casting the base class pointer returned from the framework to MyClass* the ctor for MyClass is never called and m_mydata is junk. Is there a way of only initializing the m_mydata pointer once?

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  • JOIN in SQL with one-to-many relationship

    - by Kristopher Ives
    I'm making a tool to track calls to house/senate reps, and I have 2 tables of importance here: reps rep_id rep_name # and more info comments rep_id status # enum about result of contact comment I want to query for all reps joining the most recent associated comments and in some cases joining comments of a specific status, but there might not be any comments associated with that rep yet. THANKS!

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  • Append Results from two queries and output as a single table.

    - by tHeSiD
    I have two queries that I have to run, I cannon join them But their resultant tables have the same structrure. For example I have select * from products where producttype=magazine select * from products where producttype = book I have to combine the result of these two queries, and then output it as one single result. I have to do this inside a stored procedure. PS These are just examples I provided, i have a complex table structure. The main thing is I cannot join them.

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  • How to refer to a text in an Ms Access table?

    - by manuel
    I want to refer to a data cell, which if it is equals to some string, it will do something. The codes: If ds.Tables(0).Rows(i)("Status") = "Reserved" Then MessageBox.Show("Can't reserve") End If Is this the correct way to do this? Because I failed doing so..

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  • Installer package for program that uses JDBC to connect to MySQL....

    - by eli1987
    I have an installer wizard thing called 'install creator'. I want to include my mySQL database into the installer or find another way that the user, upon installation, can just use my database. Prob is-not everyone has MySQL installed on the computer and even then, the user doesn't know the name of the database or my password. Somehow the database must be created automatically upon install, and for my purposes, some of the tables created. How can one do this. Thanks

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  • How to remove "Standard Error" column from xtable() output of an lm on R/RSweave/LaTeX

    - by Lucas Spangher
    I'm currently doing some data analysis on population data, so reporting the standard errors in the tables of parameter coefficients just doesn't really make statistical sense. I've done a fair bit of searching and can't find any way to customize the xtable output to remove it. Can anyone point me in the right direction? Thanks a lot, I didn't post this lightly; if it's something obvious, I apologize for having wasted time!

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  • Can netezza database handle procedures?

    - by san6086
    Hi I am having Netezza Database. I am querying the tables through DB visualiser. Since my table creation involves complex, I am interested to use procedures but I am unable to write it in DBvisualiser. I am confused whether the problem is with the tool that I use or in Netezza? Please advice

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  • how does sql count work?

    - by ria
    I would like to understand how exactly does sql count work. Is it a whole table scan that happens or is it some property of the table that is read. However I feel a table scan would be an overhead in case of huge tables with lots of records.

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  • how Do I list all table names in SQL Server using T-SQL?

    - by shrimpy
    SELECT name FROM sys.databases -- this can list all database name in the server user database SELECT * FROM INFORMATION_SCHEMA.TABLES -- these two line can list the table for one particular database But how can I output the results like below? Database Table --------- ------------- db1 t1 db1 t2 db2 t1 ... ...

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  • There is a JavaScript error in my rails application!

    - by Small Wolf
    As the title said, I got a problem! i encountered the "RJS Error:[object error]",the code in my application is page << "#{hidden_print("#{url_for(:controller => 'tables', :action => 'dispatch', :id => id, :pop => true, :print =>true)}")} " the method hidden_print is def hidden_print(url) "window.parent.headFrame.document.all.iframe_helper.src = '#{url}';" end

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  • data to be saved in SQLite and want to retrive data from there

    - by Mona
    In android, is it possible that we insert our database in SQLite and get back that data on our EditText boxes. I want to get data from database and populate it in my application activity. How can i do that. I want to save, update and delete my database in SQLite and most important i want to get data from database that is saved in SQLite tables. How can it be possible. Kindly guide. I will be thankfull to you

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  • How do I keep a count of undefined strings within a loop using PHP?

    - by mike
    I'm using a loop within a loop to try to generate keyword combinations and also find the ones that have been used the most. My outside loop just queries a list of keywords (lets use "chicago" as our first keyword, 3 records were found). The inside loop finds all the records in the "posts" table where keyword = "chicago". Within this loop, I need to generate strings based on info I found in the database. Which, would look something like "chicago bulls", "chicago bears", "chicago cubs" etc... I know how to do everything up until this point, but how do I temporary hold these generated strings and count how many times they have been found within the 3 records?

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  • Using stored procedures to generate RDLC report in C#

    - by NDraskovic
    I'm making an application that generates reports for my client. I'm using his database that contains stored procedures which return the data needed for the reports. The problem is that I don't know how to execute them from the application (more specific the TableAdapter in my dataset). When I use the visual aid to create the TableAdapter, it shows the error "Invalid object named #table1". This is weird because there is a temporary table called #table1 in the stored procedure. When I try to do the whole job programmatically, I get the exception Incorrect syntax near '.'. An object or column name is missing or empty. For SELECT INTO statements, verify each column has a name. For other statements, look for empty alias names. Aliases defined as "" or [] are not allowed. Change the alias to a valid name. I created a DataTable that has identical structure as the result of the stored procedure, but I still get the same exception

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  • MySQL doesn't use index in join query

    - by Kocsonya Laci
    I have two tables: comments(id(primary key), author, ip(index)) and visitors(id(primary key), date_time, ip(index)) I want to join them like that: SELECT visitors.date_time FROM comments LEFT JOIN visitors ON ( comments.ip = visitors.ip ) WHERE comments.author = 'author' LIMIT 10 It works, but very slow.. In EXPLAIN it shows that it doesn't use the index on the visitors table: id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE comments ref author author 78 const 9660 Using where 1 SIMPLE visitors ALL NULL NULL NULL NULL 8033 Any ideas? Thanks!

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  • How update dataset with datagrid view C#

    - by Paul
    I am beginner and I have this problem. How can I can update dataset with datagridview? I binding dataset in datagrid. Edit datagrid. At finish I want update dataset with datagridview. Thank you form any advice Sory, I use Winforms. Example: I bind dataset in datagridview. dataGridViewCustomers.DataSource = _ds.Tables[0]; //edit datagridview //on this place I want update dataset with datagrid view

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  • MSSQL using SSH-tunnel from Visual Studio

    - by pbt
    Hi, I recently contacted a web host regarding support for external database access to a Microsoft SQL Database included in a package they offer. They replied saying that it is only possible with an SSH-tunnel. Is it possible to connect to a MS SQL database in Visual Studio using an SSH-tunnel? It is important for me to be able to access the database from my local machine (for debugging, generating LINQ classes, editing tables, etc). Or, how should I go about working with their database?

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  • sqlserver how to set job priority

    - by Buzz
    Is there any way to set one job priority higher then other, In my case there are two jobs those are working on same set of tables,first JOB-A which is running every 12 hr and other JOB-B is every 10 minutes , i think at some time when they run simultaneously JOB-B is getting in to deadlock and get failed, i google the topic and found sqlgoverner is helpful in such cases does anyone know how to resolve?

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