MCITP SQL Server 2005 Database Developer All-in-One Exam Guide in .NET

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MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
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EXAM TIP When creating queries, the most efficient method is to use a simple comparison It may be possible to create a complex query using several embedded functions, but if efficiency is your goal, consider omitting the functions
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USE AdventureWorks; GO Declare @start datetime, @end datetime Set @start = GetDate() SELECT COUNT(*) FROM SalesSalesOrderHeader WHERE OrderDate >= '20040701' AND OrderDate < '20040702' Set @end = GetDate() Print 'Code took ' + Str((DATEDIFF(ms ,@start,@end) ), 3,0) + ' milliseconds to run'
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This query is the best It accurately returns 37 rows, and by clicking the Messages tab (as shown in Figure 6-3), it shows it took 10 milliseconds to run If you run it again, it ll probably report 0 milliseconds since the data is already in cache
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Figure 6-3 The Messages tab of a query result
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NOTE I ve listed the times I received on my test system for comparison, but the times on your system will likely be different What s important is to compare them to each other rather than to my specific times Additionally, once the data is in cache, all of the queries will run quicker By running the query twice, you are assured of seeing what the timing of the query would be if the data was in cache Method 3: Comparing Dates with the CONVERT Function This method also finetunes the first method to ensure that only the date is compared and not the time It uses the CONVERT function to convert the date to a string in the format: yyyymmdd While accurate, the CONVERT function takes considerably longer than the second method
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Declare @start datetime, @end datetime Set @start = GetDate() SELECT COUNT(*) FROM SalesSalesOrderHeader WHERE CONVERT(CHAR(8), OrderDate, 112) = '20040701'
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6: Advanced Database Objects
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Set @end = GetDate() Print 'Code took ' + Str((DATEDIFF(ms ,@start,@end) ), 3,0) + ' milliseconds to run'
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This query accurately returns 37 rows and took 33 milliseconds to run Method 4: Comparing Dates with YEAR, MONTH, and DAY Functions This method uses three different date functions to achieve the results While it is accurate, it is slower than the direct comparison
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Declare @start datetime, @end datetime Set @start = GetDate() SELECT COUNT(*) FROM SalesSalesOrderHeader WHERE YEAR(OrderDate) = 2004 AND MONTH(OrderDate) = 07 AND DAY(OrderDate) = 01 Set @end = GetDate() Print 'Code took ' + Str((DATEDIFF(ms ,@start,@end) ), 3,0) + ' milliseconds to run'
This query accurately returns 37 rows and took 16 milliseconds to run Method 5: Comparing Dates with DATEDIFF Functions This last method shown also returns an accurate result, but takes longer than the direct query It uses the DATEDIFF function to compare the given date with the OrderDate
Declare @start datetime, @end datetime Set @start = GetDate() SELECT COUNT(*) FROM SalesSalesOrderHeader WHERE DATEDIFF(day, OrderDate, '20040701') = 0 Set @end = GetDate() Print 'Code took ' + Str((DATEDIFF(ms ,@start,@end) ), 3,0) + ' milliseconds to run'
This query accurately returns 37 rows and also took 16 milliseconds to run
Deterministic vs Nondeterministic
Understanding the difference between deterministic functions and nondeterministic functions is especially important when creating indexes on a VIEW Indexes can t be created on a VIEW if the VIEW references a nondeterministic function Of course, this begs the question: What is a nondeterministic function A nondeterministic function can return different data when the function is executed at different times Table 6-6 shows a listing of nondeterministic functions
@@CONNECTIONS @@IDLE @@PACK_RECEIVED @@TIMETICKS @@TOTAL_WRITE GETUTCDATE NEWSEQUENTIALID @@CPU_BUSY @@IO_BUSY @@PACK_SENT @@TOTAL_ERRORS CURRENT_TIMESTAMP GET_TRANSMISSION_STATUS RAND @@DBTS @@MAX_CONNECTIONS @@PACKET_ERRORS @@TOTAL_READ GETDATE NEWID TEXTPTR
Table 6-6 Nondeterministic Functions
MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
The simplest example is the GETDATE function When run, it will retrieve the date, including the time (hours, minutes, seconds, and milliseconds), but if run again just a short time later, some part of the time will be different Therefore, GETDATE is a nondeterministic function A deterministic function will return the same value each time it is run, as long as the provided parameters remain the same Table 6-7 shows a listing of deterministic functions
ABS ATN2 COT DAY ISNULL MONTH RADIANS SQUARE ACOS CEILING DATELENGTH DEGREES ISNUMERIC NULLIF ROUND SQRT ASIN COALESCE DATEADD EXP LOG PARSENAME SIGN TAN ATAN COS DATEDIFF FLOOR LOG10 POWER SIN YEAR
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