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SQL Server 2008 introduces separate DATE and TIME data types for the first time . Previous versions of SQL Server only supported combined date and time types . You had to make do with the whole date plus time package, even when you needed to represent only a date or only a time . This section is dedicated to handling only dates or only times prior to SQL Server 2008 . When you need to specify only dates, you omit the time portion . When converted to a date and time type (DATETIME or SMALLDATETIME prior to SQL Server 2008), such a value will still contain a time portion, but it will represent midnight . Similarly, when a character string with only a time portion is converted in a T-SQL statement to a date and time type, SQL Server will set the date part to its base date of January 1, 1900 . If you care only about the date or only about the time, when writing T-SQL code, specify only the part you care about and allow SQL Server to assume the defaults I mentioned earlier . This will simplify manipulation of those values . For example, suppose that you want to create a DEFAULT constraint that stores the current date in a column named dt . If you simply use the

If you suspect that a plan that accesses the tables in a different order than the one chosen by the optimizer will be more efficient, you can force the order of join processing by using one of two options. You can use the FORCE ORDER hint as follows, forcing the optimizer to process the joins physically in the same order as the logical one: SELECT DISTINCT C.CompanyName AS customer, S.CompanyName AS supplier FROM dbo.Customers AS C JOIN dbo.Orders AS O ON O.CustomerID = C.CustomerID JOIN dbo.[Order Details] AS OD ON OD.OrderID = O.OrderID JOIN dbo.Products AS P ON P.ProductID = OD.ProductID JOIN dbo.Suppliers AS S ON S.SupplierID = P.SupplierID OPTION (FORCE ORDER);

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The formula you use to calculate tile number depends on what exactly you want to do with the remainder in case the number of rows in the table doesn t divide evenly by the number of tiles. You might want to use the built-in NTILE function s approach: Just assign the remainder to the rst tiles, one to each until it s all consumed. Another approach, which is probably more correct statistically, is to more evenly distribute the remainder among the tiles instead of putting them into the initial tiles only. When you need the former approach, you can simply use the built-in NTILE function. For the sake of completeness, I ll also provide a solution based on subqueries. If you need the latter approach, you have to develop your own solution because this case has no built-in function. I ll start with the second approach, calculating tile numbers with even distribution. You need two inputs to calculate the tile number for a row: the row number and the tile size. You already know how to calculate row numbers. To calculate the tile size, you divide the number of rows in the table by the requested number of tiles. The formula that calculates the target tile number is

CURRENT_TIMESTAMP function as dt s default, you will need to use range filters when looking for a particular date . Instead of using CURRENT_TIMESTAMP as the default, use an expression that sets the time part to midnight . One way to handle this task is to use the following expression:

The trick that allows you to distribute the remainder evenly is to use a decimal calculation when calculating the tile_size value instead of an integer one. That is, instead of using an integer calculation of the tile size (num_rows/num_tiles), which truncates the fraction, use 1.*numrows/numtiles, which returns a more accurate decimal result. Finally, to get rid of the fraction in the tile number, convert the result back to an integer value.

CAST(CONVERT(CHAR(8), CURRENT_TIMESTAMP, 112) AS DATETIME)

This query generates the execution plan shown in Figure 5-4, where you can see that tables are accessed in the order they appear in the query.

6

Here s the complete query that produces tile numbers using the even-distribution approach:

The expression first converts the current date and time to a character string in the form YYYYMMDD without the time part . When the resulting character string is converted back to DATETIME, SQL Server interprets the time to be midnight . Similar to the last expression, use style 114 to extract only the time portion of CURRENT_TIMESTAMP, like so:

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