define tables and fields
Define Tables and Fields
... won't create tables; you will create the tables for the users, and they will fill the data into the tables using your applications. When the user fills in the data, the application and SQL Server ... of the data is and what the allowed length is. The Allow Nulls property determines whether the user even has to enter data. Comments Creating the tables, made up of columns and rows, is the ... a successful database. Plan out your tables ahead of time, examining each real-world object, and transfer those properties to the columns that make up the tables that represent your objects....
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Tài liệu Altering tables and contraints ppt
... NoneAltering Tables and Constraints 12Ć19Renaming and Truncating a TableAdditional DDL commands include the RENAME command, which is used torename a table, view, sequence, or synonym, and the TRUNCATE ... dropconstraints, and enable or disable constraints by using this command.If you want to remove a table, both the rows and the data structure of a table, invokethe DROP TABLE command. Other commands that ... them.Introduction to Oracle: SQL and PL/SQL Using Procedure Builder12Ć28Altering Tables and Constraints 12Ć23SummaryData definition commands (DDL) allow you to create, modify, remove, and renameobjects....
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Tài liệu Mapping Tables and Columns docx
... statement to populate a DataSet object named myDataSet: SqlCommand mySqlCommand = mySqlConnection.CreateCommand(); mySqlCommand.CommandText = "SELECT CustomerID AS MyCustomer, CompanyName, ... CustomerID = ALFKI CompanyName = Alfreds Futterkiste Address = Obere Str. 57 Mapping Tables and Columns In Chapter 3, "Introduction to Structured Query Language (SQL)," you ... TableName property of the DataTable object myDataSet .Tables[ "Customers"].TableName = "Cust"; // display the DataSetTable and SourceTable properties Console.WriteLine("myDataTableMapping.DataSetTable...
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Tài liệu Define Defaults and Constraints pptx
... potential and how to create them in Visual Studio .NET. You have started down the path of handling your business rules by creating tables and setting the data types of the columns in the tables. ... between tables. Now you want to make life easier for your users and suggest what values they could use, and more importantly, what values are acceptable. How do you do this by defining defaults and ... 2.5 Define Defaults and Constraints One of the main concepts to keep in mind when you're creating databases is that you need to provide a means to keep garbage (bad data) out of your tables. ...
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Tài liệu Mapping Tables and Columns doc
... statement to populate a DataSet object named myDataSet: SqlCommand mySqlCommand = mySqlConnection.CreateCommand(); mySqlCommand.CommandText = "SELECT CustomerID AS MyCustomer, CompanyName, ... Mapping Tables and Columns In Chapter 3, "Introduction to Structured Query Language (SQL)," you ... 'ALFKI'"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet(); mySqlConnection.Open(); mySqlDataAdapter.Fill(myDataSet,...
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Tài liệu Utilizing Properties for Tables and Columns doc
... Utilizing Properties for Tables and Columns Tables and columns, like other objects in your database, have properties that allow you to control the data that is going into your tables. For example, ... Address, Phone, and so on. These would be fields, or columns, within each row. In a database, you will also have objects that allow you to query information within tables and update information. ... Stored Procedures, and Functions to view and update data within the database. To use these objects, you need to be able to create them. To create a database along with its tables in SQL Server,...
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Tài liệu Altering tables and constraints pptx
... command.Introduction to Oracle: SQL and PL/SQL Using Procedure Builder12Ć24Introduction to Oracle: SQL and PL/SQL Using Procedure Builder12Ć20Altering Tables and Constraints 12Ć13Adding and ... and is no longer available in the data dictionary.Altering Tables and Constraints 12Ć25Practice OverviewIn this practice, you will create, modify, and drop tables related to the EMPLOYEE and ... them.Altering Tables and Constraints12Introduction to Oracle: SQL and PL/SQL Using Procedure Builder12Ć16Altering Tables and Constraints 12Ć3ObjectivesAfter you create your tables, you may...
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Dynamically Creating and Configuring Text Fields
... which methods and properties are shared by movie clip and text field instances. In addition to the properties and methods discussed thus far, text fields have numerous unique methods and properties ... text fields are created and their properties set. The statusField_txt text field appears below the movingField_txt text field, and the box_mc movie clip instance has the same position and size ... lines of script call the functions we just defined so that the statusField_txt text field and the box_mc movie clip instance can be configured (as defined in the function definitions) as soon...
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Tài liệu Define a Primary Key and Other Indexes docx
... from the right-click menu. 2.3 Define a Primary Key and Other Indexes Indexes are used to improve performance when querying data, such as searching on fields and sorting information. The primary ... ID. This How-To discusses what the best candidates are for primary keys, as well as how to create them and other indexes. You have created a base table and have even entered data into it. How ... finding specific records? LastName and FirstName fields won't work because you can have duplicates of those. You also want to make sure that when you search on fields, you get the best possible...
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Tài liệu Define Relations Between Tables pptx
... you are interested, and then view the related tables. 2.4 Define Relations Between Tables Relationships define how your information needs to "relate" between tables in your database. ... to hold the phone types and then to link this new table to tblCustomerPhones via a link called PhoneTypeID. For more examples of relationships, check out the tables and their relationships ... perhaps you have tables in your database called Customers, Orders, and Order Details as the sample Northwind database does. You would want to create relationships between these tables to make...
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Tài liệu Comparing Fields and Methods pptx
... Comparing Fields and Methods First, let's recap the original motivation for using methods to hide fields. Consider the following struct that represents ... later origin.X += 10; There is no doubt that, in this case, using fields is cleaner, shorter, and easier. Unfortunately, using fields breaks encapsulation. Properties allow you to combine the ... cannot be checked and controlled. For example, the ScreenPosition constructor range checks its parameters, but no such check can be done on the “raw” access to the public fields. Sooner or later...
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