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If you think you may have a many-to-many relationship, you should think again Most likely, you missed a table in your model, or perhaps an additional necessary link in the relationship, or a filter Many-to-many relationships are usually established through a relationship table that provides the valid combinations For instance, in an education model, you might have a table of teachers and a table of classes And you might think there would be a many-to-many relationship because each teacher can teach multiple classes, and each class can be taught by multiple teachers But there should be another table that would provide the valid combinations of teachers and classes That table would be linked many-toone to teachers, and many-to-one to classes You would not have a many-to-many relationship in that model

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relationship between the two query subjects in the diagram, you will save time if you do the following things: Make sure your query items are showing in the diagram (choose Diagram | Diagram Settings, and then select Query Items under Level of Detail); and drag from the query item in the query subject on the one side of the relationship to the related query item in the query subject on the many side of the relationship If you create the relationship by selecting the query items and choosing Create Relationship from the context menu, select the query item on the one side of the relationship first Framework Manager assumes that you are creating a one-to-many relationship, and it further assumes that the item you click first is on the one side of that relationship It also assumes that the query items you clicked will be the items that define the relationship So, just by clicking the right place, you should have most of your relationships defined correctly for you

In this chapter, you have learned about the different migration methodologies for migrating databases to the Exadata Database Machine These methodologies have been proven to be successful in real-world migrations that have complex requirements In order for you to navigate a large migration project, the details listed in this chapter will help you plan the outcome that will be successful, the most cost effective, and the one that applies best in your environment

What about the 01 and 0n cardinality settings Let s review the difference between inner joins and outer joins When you join information from two query subjects by creating a relationship, you specify the join criteria; that is, you define which field or fields in one query subject should match which field or fields in the other query subject An inner join is characterized by requiring that the information exists in both tables in order for it to be part of the result Inner joins will use only the 11 and 1n cardinalities An outer join says that the information should still be returned if it exists in one of the query subjects even if it does not have a match in the other Outer joins are useful when the absence of information is itself informative For instance, if you have a query subject of Employee information and another that returns Employee Reviews, you might not have a review in your query subject results for every employee From a report perspective, it would be nice to know which employees have not been reviewed, as well as knowing the reviews that some employees have received By specifying an outer join as a relationship with 11 cardinality on the Employee side and 0n cardinality on the Employee Review side, when you report employee review information you will always get the full list of employees and their related review information, if any exist While it might seem beneficial always to model relationships using outer joins, be forewarned that execution of outer joins is usually less efficient than the execution of comparable inner joins Sometimes it is much less efficient Before you model something as

Let's see how this is done by creating a connection to Microsoft SQL Server The initial step is to import that namespace The namespace for Microsoft SQL Server is SystemDataSqlClient We import that namespace by using the following page directive at the beginning of the ASPNET web page

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