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9 To see what has been modified, use this script:
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SELECT * FROM ArchiveAuditAccess SELECT * FROM AuditAccess
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Most triggers are AFTER triggers In other words, they fire after the DML statement has occurred DML triggers can also be created as INSTEAD OF triggers Just as the name implies, an INSTEAD OF trigger will fire instead of the DML statement that triggered it INSTEAD OF triggers are not available for DDL triggers
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The classic reason to use an INSTEAD OF trigger is for a VIEW that can t otherwise be updated Most VIEWS can be updated Let s first look at a simple VIEW:
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CREATE VIEW vwStockQuotes AS SELECT Symbol, Date, High, Low, ClosingPrice, SharesSold FROM Stocks
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NOTE This script won t run against any databases we ve been working with It s used as an example only
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As new stock data is received we can insert them into the VIEW and they will be inserted into the underlying table However, if these are stock data, a single table could easily comprise millions of rows Instead of a single table, we could divide the data into two (or more) tables and use a UNION clause to combine the data in a distributable VIEW Let s say we horizontally partition the stock table into two tables: StocksAL (for all the stocks that start with the letters A through L), and StocksKZ (for all the stocks that start with the letters K through Z) We could further optimize the partitioned table by storing the different partitions on different physical disks Our distributed VIEW would be created with a script like the following:
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CREATE VIEW vwStockQuotes AS SELECT Symbol, Date, High, Low, ClosingPrice, SharesSold
MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
FROM StocksAL UNION SELECT Symbol, Date, High, Low, ClosingPrice, SharesSold FROM StocksKZ
NOTE This script will not run against any databases we have been working with It is used as an example only
While this VIEW would work great for viewing the data, the data cannot be updated through the VIEW because of the UNION clause Let s say that, occasionally, the SharesSold column needs to be updated to account for only finalized sales Unfortunately, VIEWs created with a UNION clause can t be directly updated The VIEW isn t intelligent enough to know that an update to SharesSold for the MSFT stock on a given date would need to update the StocksKZ table Instead, we would create an INSTEAD OF trigger EXAM TIP Distributed VIEWs can not be updated directly since they are created with a UNION clause To update data in a distributed VIEW, use a DML INSTEAD OF trigger By creating an INSTEAD OF trigger on the VIEW, we can cause any updates to execute the trigger instead of trying to do the update to the VIEW directly The trigger would include logic to determine which base table to update Exercise 64: Create an INSTEAD OF DML Trigger to Use with a Distributed VIEW 1 Create a New Query window in SSMS 2 Use the following script to create a table named State and populate it with some data We ll use this as a lookup table to verify that a state exists
USE 6; GO CREATE TABLE dboState ( StateID char(2) NOT NULL, CONSTRAINT [PK_State_StateID] PRIMARY KEY CLUSTERED ( StateID ) ); GO --Populate the table INSERT INTO State VALUES('VA'); INSERT INTO State VALUES('CA'); INSERT INTO State VALUES('OK'); INSERT INTO State VALUES('WI');
3 We ll now create two ZipState tables (one for ZIP codes that start with the numbers 1 through 5, and the other for ZIP codes that start with
6: Advanced Database Objects
numbers 6 through 9) and establish a relationship between the tables on the StateID columns After creating the tables, we ll populate them with some data
CREATE TABLE dboZipState1To5( ZipState1To5ID int IDENTITY(1,1) NOT NULL, ZipCode int NOT NULL, State char(2) NOT NULL, CONSTRAINT FK_State_State1To5 FOREIGN KEY(State) REFERENCES dboState(StateID), CONSTRAINT [PK_ZipState_ZipState1To5ID] PRIMARY KEY CLUSTERED ( ZipState1To5ID ) ); GO CREATE TABLE dboZipState6To9( ZipState6To9ID int IDENTITY(1,1) NOT NULL, ZipCode int NOT NULL, State char(2) NOT NULL, CONSTRAINT FK_State_State6To9 FOREIGN KEY(State) REFERENCES dboState(StateID), CONSTRAINT [PK_ZipState_ZipState6To9ID] PRIMARY KEY CLUSTERED ( ZipState6To9ID ) ); --Populate the tables INSERT INTO ZipState1To5 (ZipCode, State) VALUES(23462,'VA'); INSERT INTO ZipState1To5 (ZipCode, State) VALUES(44562,'WI'); INSERT INTO ZipState6To9 (ZipCode, State) VALUES(94562,'CA'); INSERT INTO ZipState6To9 (ZipCode, State) VALUES(74562,'OK');
4 Create a distributed VIEW using the two tables with the following script:
CREATE VIEW vwZips AS SELECT ZipState1To5ID AS ZipStateID, ZipCode, State FROM ZipState1To5 UNION SELECT ZipState6To9ID, ZipCode, State FROM ZipState6To9
5 To view the data from the VIEW, use the following query:
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