technical details regarding the data
MATERIALS AND METHODS (for definitions and additional details, see the technical appendix at end of chap- ter): Sources of data pdf
... equivalent to testing the hypothesis that the slope of the line in the above equation is equal to zero The latter hypothesis is tested using the t distribution of m/SEm with the number of degrees ... mothers of children with ALL were more accurate in their reporting of medication use than the control mothers Since mothers are asked in these studies to recall their use of medication and other ... defined as the difference in the regression coefficients divided by the standard error of the difference [5] Mortality data: The mortality data are from public use files provided by the National...
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The data is highdimensional The desire of projecting those data onto a lowerdimensional subspace without losing importance information regarding some characteristic of the original variables
... descending from the definitions of u-separation and d-separation is the Markov property (or Markov condition), which defines the decomposition of the global distribution of the data into a set ... Another fundamental result: Markov blanket (Pearl 1988) of a node 𝑋𝑖 , the set that completely separates 𝑋𝑖 from the rest of the graph Markov blanket is the set of nodes that includes all the ... the random variables, and edges (link) 𝑒 ∈ 𝐸 express the dependence structure of the data (the set of dependence relationships among subsets of the variables in X) with different semantics for ...
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Software Development Methodologies for the Database World
... to remember that data is not “just data in most applications—rather, the data in the database models the actual business Therefore, data rules must mirror all rules that drive the business itself ... requirement in another The database is, in most cases, the center of the applications it drives The data controls the applications, to a great extent, and without the data the applications would ... with the data As a general guideline, you should try to implement as many data rules as necessary in order to avoid the possibility of data quality problems The database is the holder of the data, ...
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Executing Commands that Modify Information in the Database
... modify the new row just added The following code sets the CommandText property of mySqlCommand to an UPDATE statement that modifies the CompanyName column of the new row, and then calls the ExecuteNonQuery() ... DisplayRow() that retrieves and displays the details of a specified row from the Customers table DisplayRow() is used in the program to show the result of the INSERT and UPDATE statements Listing ... number of rows affected by the command In this example, the value returned is the number of rows added to the Customers table, which is since one row was added by the INSERT statement Let's take...
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Tài liệu Troubleshooting SQL 2005: Opening the Database Administrator’s Toolbox doc
... processed the required data The number of choices concerning which data to record is again quite daunting, but the included templates help narrow down the monitoring selections Using the templates ... on One of the most powerful aspects of Profiler is its ability to import performance data from a counter log Once imported, you can click on the spike in the performance data The two data are ... performance data returned from a simple query This statement returns the current values of the performance counters for SQL 740 rows of dynamic information gathered from the exact time the query...
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Tài liệu Exploring the DataAdapter and DataTable Events docx
... with the value that is changing ProposedValue object Gets or sets the new value for the DataColumn Row DataRow Gets the DataRow that contains the DataColumn with the value that is changing The ... committed in the DataRow However, if you start the change to the DataRow using the BeginEdit() method, then the change is committed only when you call the EndEdit() method of that DataRow You ... Commit, which indicates the DataRow has been committed in the DataTable Delete, which indicates the DataRow has been removed from the DataTable Nothing, which indicates the DataRow has not changed...
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Tài liệu Using Stored Procedures to Add, Modify, and Remove Rows from the Database phần 1 pdf
... BY ProductID"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySelectCommand; The SELECT statement is then run when you call the mySqlDataAdapter object's ... from your DataSet, and then call the Update() method of your DataAdapter, the appropriate stored procedure is run to push your changes to the database Let's take a look at how to set the InsertCommand, ... deleted' ) By using SET NOCOUNT ON before the INSERT, only the number of rows affected by the DELETE statement is returned, and the DataAdapter therefore gets the correct value Transact-SQL also has...
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Tài liệu Using Stored Procedures to Add, Modify, and Remove Rows from the Database phần 2 doc
... = new DataColumn[] { myDataTable.Columns["ProductID"] }; // step 2: use the Find() method to locate the DataRow // in the DataTable using the primary key value DataRow myEditDataRow = myDataTable.Rows.Find(productID); ... to the database The AddProduct4() stored procedure is run to add the new row to the Products table, and the RowState of myNewDataRow changes to Unchanged Modifying a DataRow in a DataTable The ... mySqlDataAdapter.Fill(myDataSet, "Products"); mySqlConnection.Close(); The int returned by the Fill() method is the number of rows retrieved from the database and copied to myDataSet The myDataSet...
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Tài liệu Changing the Database for an Open Connection pdf
... specifies the name of the database to use in place of the current database The name of the database must be valid or an ArgumentException will be raised If the connection is not open when the method ... if the database cannot be changed for any reason The Database property of the Connection object is updated dynamically and returns the current database for an open connection or the name of a database ... result.Append("Database: " + conn.Database + Environment.NewLine); // Change the database to pubs conn.ChangeDatabase("pubs"); result.Append("Database: " + conn.Database + Environment.NewLine); // Close the...
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Tài liệu Mapping Table and Column Names Between the Data Source and DataSet docx
... submitting DataSet changes back to the data source In the solution, the Categories table retrieved by the query is mapped to a table in the DataSet called tblmapCategories with the following code: DataTableMapping ... fill a DataSet, the column names used in the DataSet default to the column names defined in the data source A DataAdapter has a collection of DataTableMapping objects in its DataTableMappingCollection ... property These objects map the name of a table in the data source to a DataTable with different name in the DataSet When a batch query is used to fill multiple tables within a DataSet, the table...
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Tài liệu Retrieve Data by Using the DataReader Object docx
... opened, and the ExecuteReader method is called After the list has been cleared, the DataReader is iterated through, and the ListBox control is loaded Comments The DataReader object is one of the most ... object in the single statement This is new to NET and is extremely useful How It Works When the user clicks the btnLoadList button, the Command object is assigned the necessary properties, the connection ... to a literal Then, within a Try-Catch-End-Try block, a new instance of an OleDbCommand object called ocmdCust is created The routine then follows the steps that are discussed in the Technique...
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Tài liệu Using the Data Form Wizard to Create a Windows Form phần 1 pdf
... on the right, enter the Name of the form as MyDataForm.cs, and click Open (see Figure 6.18) You'll then see the welcome page for the Data Form Wizard Figure 6.18: Adding a data form using the Data ... Choosing the data connection Click the Next button to continue You now log in to the database by specifying the password for the database user You used the sa user when creating the database ... creating a new DataSet Enter myDataSet as the name for your DataSet, as shown in Figure 6.19 Figure 6.19: Entering the name of the new DataSet Click the Next button to go to the next step You...
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Tài liệu Using the Data Form Wizard to Create a Windows Form phần 2 doc
... set the data binding for a control, you select the control in the form designer and expand the DataBindings properties in the Properties window You'll see these properties in the Data area of the ... part of the form shows the details for the row from the Customers table where the CustomerID is ALFKI; the bottom part of the form contains a DataGrid control that displays the rows from the Orders ... column in a DataSet object, the value for that column is displayed in the control through the Text property in the DataBindings group The Text property in the DataBindings group sets the text displayed...
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Tài liệu The DataColumn Class pdf
... to a DataRow The default is false DataTable Gets the DataTable to which the DataColumn object belongs bool Gets or sets a bool value that indicates whether the DataColumn values in each DataRow ... Table 11.6: DataColumn PROPERTIES TYPE DESCRIPTION int Gets the numeric position of the DataColumn object (0 is the first object) bool Gets or sets a bool value that indicates whether the DataColumn ... indicates whether the DataColumn values in each DataRow object must be unique The default is false You'll see the use of some of these properties, methods, and events later in this chapter ...
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Tài liệu Creating a Table in the Database from a DataTable Schema docx
... control whether the new table is created The second DDL command uses the CREATE TABLE statement to create the table in the database The code iterates over the collection of the columns in the DataTable ... retrieve the name and the maximum length of the column and whether the column is an identity column or allows null values A method is called to map the NET data types of the DataTable to SQL Server data ... through the collection of DataRelation objects for the DataSet and use the ALTER TABLE statement with the ADD CONSTRAINT command and a FOREIGN KEY argument to add the table relations to the database...
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Tài liệu Add, Edit, and Delete Data Using the DataGrid Control doc
... object The Session variables are then updated, with the IsAdding item set to True Lastly, the EditItemIndex of dgLookupData is then set, and the DataGrid bound to the data table using the BindTheGrid ... Returns the number of rows that are currently in the DataTable object DataTable Creates a new DataRow object NewRow DataTable.Rows Add Adds the DataRow object to the DataTable object DataTable ... exists, then this is a round trip, and you don't need to reload the data from the server If it doesn't exist, then the Region table Schema is supplied using the FillSchema method, and then the DataTable...
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Tài liệu Filter and Sort Records Using the DataView Object pptx
... Works When the user clicks on a letter, the data view is created, and the data grid reflects the new data When a field is selected from the ComboBox control, the Sort property of the data view ... to the current column name chosen in cboSortColumns If the two are the same, then the column name is assigned to the Sort property with the DESC keyword added on If not, then the name of the ... Using the command buttons, a routine is called that creates a DataView object, sets the RowFilter property, and then assigns the data view to the DataSource property of a DataGrid control...
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