SELECT * FROM PurchasingVendor in .NET framework

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SELECT * FROM PurchasingVendor
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Figure 4-15 The Purchasing Vendor result set
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3 Open the AdventureWorks database (if it s not already opened) by doubleclicking the Databases container and the AdventureWorks database 4 Double-click the Tables container to open it, and then double-click the PurchasingVendor table to open it 5 Double-click Columns to open the Columns container in the Purchasing Vendor table Notice that most columns are specified as NOT NULL These either need to have data identified in an INSERT or have a default defined
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4: Transact-SQL
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6 Double-click the Constraints container to open it Notice that we have four constraints The CK_Vendor_CreditRating ensures that a credit rating between 1 and 5 is entered The other three are defaults for the ActiveFlag, ModifiedDate, and PreferredVendorStatus columns 7 Double-click the Triggers folder Notice the trigger named dVendor This prevents a vendor from being deleted Your display should look similar to Figure 4-16
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Figure 4-16 Object Explorer viewing the Purchasing Vendor table
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8 With the information we have, we can now build our INSERT statement Table 4-8 summarizes the columns and shows that only three columns must be added
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VendorID AccountNumber Name CreditRating PreferredVendorStatus ActiveFlag PurchasingWebServiceURL ModifiedDate
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Created with IDENTITY Must be added Specified as NOT NULL Must be added Specified as NOT NULL Must be added Specified as NOT NULL Constraint specifies range between 1 and 5 Specified as NOT NULL, but has DEFAULT specified if omitted Specified as NOT NULL, but has DEFAULT specified if omitted Can be NULL Specified as NOT NULL, but has DEFAULT specified if omitted
Table 4-8 The PurchasingVendor Table
MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
Use the following INSERT statement to add the Acme Supplies Company with a credit rating of 1 and an account number of AcmeSupp101:
USE AdventureWorks INSERT INTO PurchasingVendor (AccountNumber, Name,CreditRating) VALUES('AcmeSupp101','AcmeSupplies',1)
9 Verify your vendor has successfully been added with the following SELECT statement:
USE AdventureWorks SELECT * FROM PurchasingVendor WHERE AccountNumber = 'AcmeSupp101'
10 The vendor is experiencing some cash-flow problems, and their credit rating has been changed from 1 to 3 Use the following UPDATE statement to make this modification:
USE AdventureWorks UPDATE PurchasingVendor SET CreditRating = 3 WHERE AccountNumber = 'AcmeSupp101'
If you experiment with this script by changing the credit rating to 6 or something other than a number between 1 and 5, you ll see how the constraint prevents invalid data from being entered 11 Verify the credit rating has been updated by rerunning the SELECT statement from step 9 12 Let s assume the Acme Supplies Company was entered during testing No company exists with that name You are tasked with deleting the row for the Acme Supplies Company Use the following DELETE statement to try and delete the row:
USE AdventureWorks DELETE FROM PurchasingVendor WHERE AccountNumber = 'AcmeSupp101'
Running this script, you ll receive an error message like the following This is because a trigger exists on the table
Vendors cannot be deleted They can only be marked as not active
We ll explore triggers further in 5, but for now realize that since the trigger is preventing us from accomplishing our task, we can temporarily disable the trigger 13 Use the following script to disable the trigger, delete the row, and then re-enable the trigger Note that we are using two different methods to affect the trigger (DISABLE TRIGGER and ALTER TABLE)
4: Transact-SQL
USE AdventureWorks Go DISABLE TRIGGER dVendor ON PurchasingVendor GO DELETE FROM PurchasingVendor WHERE AccountNumber = 'AcmeSupp101' GO ALTER TABLE PurchasingVendor ENABLE TRIGGER dVendor
EXAM TIP A trigger can be disabled in two ways One is with the command DISABLE TRIGGER triggername ON tablename The second is with the command ALTER TABLE tablename DISABLE TRIGGER triggername
Advanced Query Techniques
When preparing for the 70-442 test, you ll need to understand the advanced query techniques available in SQL Server 2005 These include:
Common Table Expressions (CTEs) EXCEPT and INTERSECT PIVOT and UNPIVOT Ranking functions
Common Table Expressions (CTEs)
Common Table Expressions (CTEs) are new to SQL Server 2005 They are used to provide a temporary result set within any DML statement The CTE then works and appears as a table to the rest of the statement The CTE is similar to a derived table it doesn t persist in the database, but instead lasts only for the duration of the query However, the CTE can be self-referencing and can be referenced multiple times in the same query The following is a simple example of a CTE
USE AdventureWorks GO WITH cteEmployees( FirstName, Lastname) AS ( SELECT FirstName, LastName FROM PersonContact c JOIN HumanResourcesEmployee e On cContactID = eContactID ) SELECT * FROM cteEmployees
Notice the With line [WITH cteEmployees(FirstName, Lastname)] identifies the columns in our CTE as FirstName, LastName The embedded SELECT statement can be just about any valid DML SELECT statement the requirements are the same as for creating a VIEW With the CTE created, we can now use it in a DML statement; we are retrieving the contents with a simple SELECT statement
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