hierarchical data and the relational database

... j⎥ ⎦ The lower the index value, the better the match, giving a perfect match and 100 a complete non-match We can use this relationship to rank the match between full patterns from a given database ... in this case, 3.5 nm • The software simulates a pattern for each database entry, using the d-space and intensity values • Each simulated database pattern is compared with the unknown pattern to ... difficulty in specifying the precise positions of these maxima Further, these ‘maxima’ are likely shifted from the true underlying positions of the major Bragg peaks due to the significant overlap...

Ngày tải lên: 16/03/2014, 16:20

... approach, the key parameter of choice is the width of the grid If the width of the interval is too high, then information about the temporal pattern in the returns may be lost On the other hand, a ... in HF data • Andersen et al (2001) study the shift in volatility patterns in HF data They use nonoverlapping returns to analyse the behaviour of the VR in this data They show that the standard ... inference of the serial correlations of returns Andersen et al (2001) regress the data using it’s Fourier Flexible Form and analyse the behaviour of the residuals, rather than the raw data itself...

Ngày tải lên: 24/04/2014, 00:23

... Outline  Relational Model Concepts  Relational Model Constraints and Relational Database Schemas  Update Operations and Dealing with Constraint Violations Relational Model Concepts  The relational ... Model of Data is based on the concept of a Relation  A Relation is a mathematical concept based on the ideas of sets  The strength of the relational approach to data management comes from the formal ... paper: "A Relational Model for Large Shared Data Banks," Communications of the ACM, June 1970 The above paper caused a major revolution in the field of Database management and earned Ted Codd the coveted...

Ngày tải lên: 12/05/2014, 11:55

... combine data about the past, the present and the future in the same tables Tables which this, which contain data about what the objects they represent used to be like and also data about what they ... are/will be like Tables like these, tables whose rows contain data about both the past, the present and the future of things, and also about the past, the present and the future of our beliefs about ... applications that maintain the production database Sometimes they are collected outside the target database, in batch transaction files More commonly, they are collected inside the target database, in batch...

Ngày tải lên: 27/06/2014, 06:20

... (specification) to the public and is encouraging other database companies to develop their own NET data providers Microsoft made the data access model consistent among all of the NET data providers and thus ... Oracle database You will work with the core ODP.NET classes like OracleCommand, OracleDataReader, OracleDataAdapter, OracleParameter, and ADO.NET classes like DataSet, DataTable, and DataRow ... (disconnected use) The OracleDataAdapter simply connects to the database, retrieves the information (or data) , populates that information into datasets or data tables, and finally disconnects the connection...

Ngày tải lên: 27/06/2014, 06:20

... in the classifieds Chapter Collecting Data — The Class and the Array In This Chapter ᮣ Introducing the C# class ᮣ Storing data in an object ᮣ Assigning and using object references ᮣ Creating and ... starts with Chapter 6: Collecting Data — The Class and the Array the member string sModel, which contains the name of the model of the vehicle Were this a car, the model name could be Trouper II ... num; num = 1; The first line declares the variable num, and the second line assigns an already-created constant of type int into the location of the variable num The intrinsic num and the object...

Ngày tải lên: 04/10/2013, 21:20

... attaching database files much simpler, especially if you’re a new to databases—hence the mdf and ldf files in the downloaded code of the RealWorld database So, let’s attach the database As you know, the ... need the help of the TableAdapter here, because we’ll write our own ADO.NET interface code to connect to the database and get the data All we want from the wizard is the dataset with the data ... should see the list of available databases on the server (I assume that you already have the RealWorld database attached to your server) Please select the RealWorld database as your source database...

Ngày tải lên: 05/10/2013, 08:48

... use the Web, they found that they needed to write web interfaces to their databases, or add databases to drive their web interfaces Whichever way you look at it, they needed to connect to the databases ... connect( ), it affects all other handlers retrieving this database handle Therefore, it’s best to restore the modified attributes to their original values at the end of database handle usage As of Apache::DBI ... checks that the connection is still valid using the ping( ) method If this operation succeeds, the database handle is returned immediately If there is no appropriate database handle, or if the ping(...

Ngày tải lên: 24/10/2013, 08:15

... Server 2008 Relational Database Design and Implementation Louis Davidson With Kevin Kline, Scott Klein, and Kurt Windisch 8662FM.qxp 7/28/08 6:19 PM Page ii Pro SQL Server 2008 Relational Database ... system, without the prior written permission of the copyright owner and the publisher ISBN-13 (pbk): 978-1-4302-0866-2 ISBN-13 (electronic): 978-1-4302-0867-9 Printed and bound in the United States ... Relational Data Structures Database and Schema Tables, Rows, and Columns ...

Ngày tải lên: 29/10/2013, 15:15

... developers to play their best game Database design is the foundation of every datacentric application An elegant database design makes the data obvious and easy to query and sets up the developer ... database designed by someone who didn’t understand the fundamentals of database design? The first four chapters of this book are devoted to the distinct phases of relational database design and ... misunderstanding the vital role of keys in the database can lead to severe data integrity issues and to the mistaken belief that such keys and constraints can be effectively implemented outside the database...

Ngày tải lên: 29/10/2013, 15:15

... is the discovery of business rules These are the rules that govern the operation of your system, certainly as they pertain to the process of creating a database and the data to be stored in the ... down is the schema You use schemas to group objects in the database with common themes or even common owners All objects on the database server can be addressed by knowing the database they reside ... retrieve them and how it is easiest for the database engine to get to the data So, the following view of the data is equivalent to the previous table shown: X ––– Y ––– B A C It is, of course, the...

Ngày tải lên: 08/11/2013, 21:15

... meaning to the police officer other than a means to quickly call up and check your records, the surrogate is used to make working with the data programmatically easier Since the source of the value ... understand that only having a surrogate key opens them up to having rows with duplicate data in the columns where the data has some logical relationship to each other A user looking at the preceding ... having multiple column values for each of the different pieces of information and calculating the value of the smart key The end user gets what they need, and you in turn get what you need, a column...

Ngày tải lên: 08/11/2013, 21:15

... command and fill a DataReader with the // SHAPE result set OleDbCommand cmd = new OleDbCommand(shapeText, conn); conn.Open( ); OleDbDataReader orderDR = cmd.ExecuteReader( ); // Iterate over the ... DataReader for the Order Detail from the // IDataReader interface column OleDbDataReader orderDetailDR = (OleDbDataReader)orderDR.GetValue(colOrder); // Iterate over records in the Order Detail DataReader ... retrieve hierarchical result sets or chapters (OLE DB type DBTYPE_HCHAPTER) from SQL Server using the OLE DB NET data provider The chapter is returned as a field in the data reader with a data type...

Ngày tải lên: 24/12/2013, 05:15

Ngày tải lên: 24/12/2013, 06:17

... in the data grid back to the server lblDispExcp.Text = "" Dim odaTableData As OleDb.OleDbDataAdapter Try ' Take the txtSQLString text and create data table; then set the ' data source of the data ... Create the command builder to update (post) the data ' in the data grid back to the server Dim odaRegion As OleDb.OleDbDataAdapter Try ' Take the txtSQLString text and create the data table, ' and ... 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...

Ngày tải lên: 21/01/2014, 12:20

... services, and infrastructure and thus has a higher standard of health and welfare The data would seem to bear out these assumptions For understanding the health status of urban slum children, the data ... quintiles and also by “rural” and “urban.” Health, population, and service utilization data were then compared across quintiles The data were derived from DHS household data from 44 countries, and the ... (countries and cities selected were India and Ahmedabad, the Philippines and Manila, and Egypt and Cairo) xi To guide the literature search, the team defined a set of child health status and determinants...

Ngày tải lên: 12/02/2014, 12:20

... as they apply to regular data This rule requires that a relational database be self-describing In other words, the database must contain tables that catalog and describe the structure of the database ... definable in the relational data sublanguage and storable in the catalog, not in the application programs Another of the truly fundamental concepts stressed by the founder of the relational database ... level what the users need in the database system you are creating • Logical: Design the database, and prepare it for implementation • Physical: Design and implement the database in terms of the tools...

Ngày tải lên: 12/02/2014, 12:20

... was in the intervieweradministered portion of the survey and the second was in the self-administered portion (Audio CASI) In the interviewer-administered series, they were asked whether their ... much more detailed data than ever before on the social, economic, and family background of the woman and her husband or partner (table A) To release as much of the results of the 1995 survey as ... who had moved since the NHIS interview were traced to their new address, and an interviewer conducted the interview at the new address The numbers, percents, averages, and other statistics shown...

Ngày tải lên: 12/02/2014, 23:20

... and Development (OECD), - the World Health Organization (WHO) databases: European Health For All Database (HFA), European mortality database (MDB), Alcohol control database, Tobacco control database, ... Finland, France, Germany, Iceland, Italy, the Netherlands, Norway, Poland, the UK, Slovenia, Spain, Sweden, and Switzerland) increased from 11% in the period 1988-1990 to 13% in 1997-1999 The ... Denmark, Finland, France, Germany, Iceland, Italy, the Netherlands, Norway, Poland, the UK, Slovenia, Spain, Sweden, and Switzerland) increased from 48% to 54% in both sexes in the period 1988-1999...

Ngày tải lên: 12/02/2014, 23:20

... respondent to hear the questions and response choices over headphones or read them on the screen and enter a response into the computer without the interviewer knowing what the response was The main purpose ... toward the intendedness of pregnancies based on their own reports (13) + Of all births in the years before interview, 55 percent were intended by both the mother and the father (as reported by the ... Health + The CDC’s Office of Women’s Health + + The Office of Planning, Research, and Evaluation of the Administration for Children and Families (ACF) + The Children’s Bureau of the ACF + The Office...

Ngày tải lên: 13/02/2014, 10:20