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Basic Transact-SQL Programming Constructs
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and then loop through them to display space information to users. 8. Create a stored procedure that lists orders scheduled for today with a status set to 1. 9. Create a stored procedure that lists orders and displays three character abbreviations of order status and type (that is, Ordered Ord, Canceled Cnl, Deferred Dfr, and so on). 10. Create a stored procedure that will return a recordset with the field names of the specified table. The stored procedure should have only one input parameter table name. 11. Explain the problems associated with the use of cursors. 12. Stored procedure sp_spaceused can return information about the space used by a database object. Collect the names of all tables in the Asset database using
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Use a cursor to loop through the table names to display space information to users. This exercise is equivalent to exercise 7. Compare the solutions. 13. Create two stored procedures that will return a resultset in the form of a denormalized Inventory table (see Figure 4-3). All fields in the Inventory table that are links to other lookup tables should be replaced with values from those lookup tables. Each stored procedure should use a different method to obtain information:
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SQL Server 2000 Stored Procedure Programming
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SQL Server 2000 Stored Procedure Programming
icrosoft has done a fantastic job providing database administrators with an extensive and coherent set of built-in functions for SQL Server. Users of SQL Server 2000 are now also able to create their own functions. We will cover the design of user-defined functions in 9 and focus here on the use and attributes of built-in functions.
USING FUNCTIONS
Functions are Transact-SQL syntax elements that are used to evaluate a list of parameters and return a single value to the caller. The usual syntax for calling a function is
Function_name ([parameter] [,...n])
For example, a sine function has the following syntax:
SIN(float_expression)
To display the sine of 45 degrees you can use:
SELECT SIN(45)
Some functions have more than one parameter, and some do not require parameters at all. For example, the GETDATE function returns the current date and time on the system clock to the caller. We will use the GETDATE function to present the most common ways to use functions in Transact-SQL.
In Selection and Assignment
Functions can be a value or a part of a value to be assigned or selected as a recordset. In the following example, two variables are populated using values stored in a selected record and a third variable is populated using a function:
Select @chvMake = Make, @Model = Model, @dtsCurrentDate = GETDATE()
5:
Functions
from Equipment where EqId = @intEqId
This use is not limited to the Select statement. Values can be assigned in the Set statement, displayed in the Print statement, stored in a table using Update and Insert, or even used as parameters for other functions.
Create Procedure prInsertNewSchedule @intLeaseId int, @intLeaseFrequencyId int As Insert LeaseSchedule(LeaseId, StartDate, EndDate, LeaseFrequencyId) Values ( @intLeaseId, GETDATE(), DATEADD(Year, 3, GETDATE()), @intLeaseFrequencyId) return @@Error
This procedure inserts the current date (using the GETDATE function) in the StartDate column. The EndDate column is calculated using the DATEADD function, which uses the GETDATE function as one parameter. It is used to set the end date three years from the current date.
In Filtering Criteria
Functions are often used in the Where clause of Transact-SQL statements among the filtering criteria:
SELECT Inventory.InventoryId FROM LeaseSchedule INNER JOIN Inventory ON LeaseSchedule.ScheduleId = Inventory.LeaseScheduleId WHERE (LeaseSchedule.EndDate < GETDATE()) AND (Inventory.Rent <> 0)
This Select statement selects the lease schedules that have reached end of term.
SQL Server 2000 Stored Procedure Programming
In Expressions
In general, you can use a function in any place in which you can use an expression. For example, an If statement requires a Boolean expression, the result of which will determine further execution steps:
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