Figure 1-3: Transaction Log tab of the New Database dialog box in VS .NET

Generate QR Code in VS .NET Figure 1-3: Transaction Log tab of the New Database dialog box

Figure 1-3: Transaction Log tab of the New Database dialog box
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If you have ever created a table using Microsoft Access, you should be pretty comfortable creating a table in SQL Server 2000 The design view of a table has a layout and grid format similar to Access To create a new table, browse to the database that you want to add the table to Right-click the Tables folder and select New Table You should see a design view like the one displayed in Figure 1-4
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Figure 1-4: Table design view for a number field Alternatively, you can enter the design view of an existing table by right-clicking the table and selecting Design Table The dSesign view is divided into two sections The top section is where you specify general information about the fields, allowing you to easily see all that information across the table At the bottom of the form you see specific properties for the field that are enabled or disabled according to the field type The first column in the top section of the form is where you specify the name of the field Then, in the second column, you select the data type (We will review these types in the next section) The third column shows the length of the field For some data types, like int, you can't change the size The type determines the size But for other types, such as varchar, you can set the length within certain limits The fourth column is a check box that indicates whether the field can contain null values If you deselect this property, data must be placed in the field The first field, displayed in Figure 1-4, is a numeric field Note the yellow key icon to the left of the field That means this field is a primary-1 key field A primary key uniquely identifies each record in the table To make a field the primary1 key, select it and then click the Key button on the toolbar You can also create a composite primary key, which is a primary key made up of more than one field You can do this by selecting more than one field and then clicking the Key button on the toolbar In this table, the StudentID field is also an identity column Note that the Identity property is set to Yes When you create an Identity column, you are creating a field that SQL Server automatically populates with a unique number Note that the Identity Seed property is set to 1 This means that the first record added to the table will get a value of 1 in the StudentID field The Identity Seed property is also set to 1, which means that as more records are added, the number of each is one more than the last record added So the second record would have a value of 2 in the StudentID field Another property for this field type is the Description property Here you can place information about the field that is just for you to remember something about the field Maybe the name of the field is not intuitive as to its value So, in the Description property, you could put in better information about the field Other Number fields can have the Precision and Scale properties enabled The Precision property stores the maximum number of digits allowed for data in the field The Scale field stores the maximum number of decimal places allowed for the data type Figure 1-5 shows the properties enabled for a date data type Note that the date field has different properties available One of the properties that can be used with this type, and many of the data types, is the default value property This allows you to enter a value that should be used for this field when a new record is added but a value for the field is not specified For a field like City, maybe you would default to a city name that is used in most of your record insertions But you can also use a dynamic value for the default value, as is the case with this date field Here you specify that each time a record is added to this table, and the DateEnrolled field is not specified, you insert the current system date:
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Figure 1-5: Table design view for a date field GetDate() The next figure, Figure 1-6, shows the properties that can be set for a field that will store text data One of the properties that is available with this type of field is the Collation Here you can specify how the records are collated at the field level
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Figure 1-6: Table design view for a text field To manage Indexes on the table, you can select the Manage Indexes button from the toolbar You should then see the dialog box displayed in Figure 1-7
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Figure 1-7: Indexes dialog box An index is an internal mechanism that SQL Server uses to more efficiently return records that are sorted or limited according to a specific field For example, say that you had a query that returned all the students that were born on today's date Without an index, the SQL Server would have to look at each record to see whether the birth date field matched today's date But if you index the field, SQL Server stores a list of all the birth dates sorted, as well as pointers to the full record So the server could use the index to quickly find the matching records and return them
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So why not just index every field There is a performance penalty paid for each index, because each time a record is added, edited, or deleted in a table, the server must also update the data in the index table So an extra modification has to be made beyond the table itself Therefore, you should use indexes where the fields are searched or sorted frequently, and avoid indexes on those fields that are not Creating an index is simple Just click the New button in the Indexes dialog box Select the field or fields that the index is to use and supply a name for the index in the Index Name property
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