c# itextsharp datamatrix barcode It is also possible to delete a table from a database from the designer using the following button. in C#

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It is also possible to delete a table from a database from the designer using the following button.
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If you just wish to remove the database from the diagram rather than the database, then you can use the next button to accomplish this. You would use this button, for example, if a table no longer formed part of the view the database diagram was built for.
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Any changes made to the database within the designer can be saved as a script. Use the following Generate Change Script button to accomplish this.
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If you wish to set a column to be the primary key, select the relevant column within a table and click the Set Primary Key button (shown next).
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It is possible to create a place within the diagram to put ad-hoc text. Use the following New Text Annotation button to do this.
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Each table displayed is set to a standard layout. It is possible to change this to a different predefined layout or to create your own custom view. The following Table View button enables you to change the layout or create your own custom version.
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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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Relationships that exist between tables will, by default, show as a line. However, it is possible to show the name of the relationship as a label by clicking the following button.
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Diagrams are ideal methods of documenting the database. Diagrams can be printed for meetings, discussions about future development, and so on. The following button shows the line breaks in pages that will be printed.
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Page breaks in diagrams remain as they were first set up until they are recalculated. You are able to view the page breaks, arrange your tables accordingly, and then recalculate the page breaks based on the new layout. Clicking the following button will do this recalculation for you.
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Tables can be expanded or shrunk manually, but when you select one or more tables using the Ctrl button, click the relevant tables, and then click the following button, you can resize the tables to a uniform size.
It is possible, by clicking the following button, to rearrange tables that have been selected and let SQL Server make the arrangement choices.
It is possible to rearrange the tables shown in the diagram. SQL Server will do its best to get the best layout for the tables and relationships when you click the following button.
In 5, you saw how to build a relationship between two tables. The button you use to do this appears next. This button will bring up the same dialog as you saw in that chapter.
You can also manage the indexes and keys using the dialog you saw in Figure 6-2 by clicking the following button.
It is possible to create an index on a table or column called a full-text index. This index allows for searching on text data a bit like Google. For example, Google would hold the web pages within a text data type and using a full-text index would allow for full searching on that page. Although I don t cover this type of index within this book, clicking the following button will manage these indexes.
CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
If you have indexes placed on any XML data types, clicking the next button will allow you to manage these indexes.
In 5, you learned how to build constraints for tables. Clicking the following Manage Check Constraints button brings up the same dialog you saw then.
Summary
We ve covered yet another major building block in creating a SQL Server solution. The last few chapters have shown you how to store data, and in this chapter you ve learned about indexes and how to use them to quickly and efficiently retrieve the data stored in the table. There are many types of indexes, and choosing the right one at the right time to complete the right job is quite an art. This chapter has taken you through the steps to decide which columns will make an efficient index, and then build those columns in the right type of index to make the most of the information. This chapter also covered database diagramming. Database diagrams should initially be thought of as a form of documentation. Keep in mind, though, that the database diagram tool may expand in future versions of SQL Server to become much more sophisticated and powerful than it is now although even now it is quite a powerful utility. Don t be caught out by the fact that changes in the diagram are not applied until the diagram is saved, and that your changes could overwrite another s changes. If you re using the database diagram tool for development in any sort of multiuser environment, take the greatest of care when completing updates (in fact, try to avoid them altogether). Unless you split your database solution into multiple diagrams, with any table being found in at most one diagram, don t use the database designer as a development tool.
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