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As if @@Rowcount = 0 return If Update (Lease) or Update(LeaseScheduleId) begin -- subtract deleted leases from total amount Update LeaseSchedule Set LeaseSchedule.PeriodicTotalAmount = LeaseSchedule.PeriodicTotalAmount - Coalesce(d.Lease, 0) From LeaseSchedule inner join deleted d On LeaseSchedule.ScheduleId = d.LeaseScheduleId -- add inserted leases to total amount Update LeaseSchedule Set LeaseSchedule.PeriodicTotalAmount = LeaseSchedule.PeriodicTotalAmount + Coalesce(i.Lease, 0) From LeaseSchedule inner join inserted i On LeaseSchedule.ScheduleId = i.LeaseScheduleId End Go
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In this chapter, we set out to examine types of stored procedures other than the user-defined variety that we use throughout the remainder of this book. In the course of this examination, we learned:
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How SQL Server uses extended stored procedures to capture the functionality of dynamic link library files developed in programming languages such as C and C++ How temporary stored procedures are useful in situations where the required functionality is not required after the session is over, and how their use can reduce maintenance requirements How global temporary stored procedures are useful when you need to access a temporary stored procedure from multiple databases How we can use remote stored procedures to execute stored procedures that reside on a remote server.
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The design and use of user-defined functions is a new feature in SQL Server 2000. User-defined functions can return tables using the table datatype also new to SQL Server 2000. The power of in-line user-defined functions can be harnessed to implement parameterized views. Triggers are standard and powerful tools in the utility belt of a database administrator. In this chapter, we have learned how to use triggers to enforce referential integrity and to implement business rules. We have also mastered the use of the virtual tables, Inserted and Deleted, to access changed records from within a trigger. We have witnessed how valuable it is to be able to obtain information concerning which table columns in a table have been updated. We have examined techniques for designing triggers to handle changes on more than one record, for managing triggers in different GUI environments (Enterprise Manager, Query Analyzer), and using Transact-SQL. Last, we have seen how to roll back a transaction from within the trigger. Earlier versions of SQL Server had only one type of trigger. SQL Server 2000 has introduced two types of triggers (although one type is equivalent to the only type available in previous versions). The type that was in use in earlier versions is now called an after trigger. The new type, known as an instead-of trigger, replaces the modification statement that initiates the trigger. The instead-of
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trigger creates some exciting opportunities for developers. It is possible to create instead-of triggers on views as well as on tables. Such triggers can normalize data and store it in a set of base tables behind the view.
EXERCISES
1. Create a function that returns the last date of a month containing a specified date. 2. Create a function that returns a table containing the last days of months in a specified number of following years. 3. Create a trigger on the Inventory table that will record in the ActivityLog table the user who is deleting assets from the database. The log should contain the user name of the person deleting records, the date of the deletion, and the IDs of the assets deleted. 4. How can you disable nested and recursive triggers in SQL Server 5. How can an administrator temporarily disable a trigger to allow the performance of administrative activities on a table 6. Create a view for displaying denormalized information contained in the Inventory table. Design an instead-of insert trigger on the view to accommodate uploading of Inventory information from an external source.
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