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ISNULL validates if an expression is NULL, and if so, replaces the NULL value with an alternate value. The COALESCE function returns the first non-NULL value from a provided list of expressions. NULLIF returns a NULL value when the two provided expressions have the same value. Otherwise the first expression is returned.

The decision was made to write a new Fortran 95 compliant compiler, known as gfortran, rather than do a substantial rewrite of g77 to bring it into line with the latest GCC internals Because FORTRAN 77 is essentially a proper subset of Fortran 95, most existing code that you can compile with g77 can also be compiled with gfortran Later in this chapter, the section Classic GNU Fortran: The g77 Compiler discusses the status of g77 and explores issues in migrating and compiling code that was written for use with g77..

ISNULL validates if an expression is NULL, and if so, replaces the NULL value with an alternate value. In this example, any NULL value will be replaced with a different value: SELECT LastName, ISNULL(Title, 'UNKNOWN') Title FROM Person.Contact WHERE LastName LIKE 'Sa%' This returns the following (abridged) results: LastName ... Sam Samant Sandstone ___ Title Mr. UNKNOWN Mr.

You don t have to dither to monochrome, though you can also dither to different numbers of colors using the colors command-line option discussed in 2. For example, this command limits the picture to using eight colors: convert -dither -colors 8 input.jpg output.jpg This command line gives you the picture shown in Figure 6-12.

In this example, the LastName column and Samant had a NULL value for the Title column. The ISNULL function replaced that NULL value with the UNKNOWN string expression in the query results.

At the time this book was written, GCC s gfortran compiler was largely, but not completely, compliant with Fortran 95. Work toward this goal is actively in progress. Currently, there are still known problems with using the ENTRY and the NAMELIST declarations, as well as with more advanced uses of MODULES, POINTERS, and DERIVED TYPES. If you are trying to compile Fortran 95 code that you can t get to work with gfortran, file a bug with the GNU folks (http://gcc.gnu.org/bugs.html). If the problem you have encountered is a show-stopper for you, see the section later in this chapter titled Alternatives to gfortran and g77.

In this recipe, I ll demonstrate how to perform flexible, dynamic searches in a query when the variables may or may not be populated. This recipe declares three local search variables for ProductID, StartDate, and StandardCost. By using this technique, your query can return results based on all, , only a ProductID is supplied:

This section discusses how to compile applications using gfortran and provides sample code that highlights some of the features of gfortran and the changes in Fortran over the last n years. It begins by highlighting compilation options that are shared with other compilers in the GCC family.

-- Local variables used for searches DECLARE @ProductID int DECLARE @StartDate datetime DECLARE @StandardCost money -- Only @ProductID is used SET @ProductID = 711 SELECT ProductID, StartDate, StandardCost FROM Production.ProductCostHistory WHERE ProductID = ISNULL(@ProductID, ProductID) AND StartDate = ISNULL(@StartDate, StartDate) AND StandardCost = ISNULL(@StandardCost, StandardCost) This returns: ProductID 711 711 711 StartDate 2001-07-01 00:00:00.000 2002-07-01 00:00:00.000 2003-07-01 00:00:00.000 StandardCost 12.0278 13.8782 13.0863

Compiling Fortran applications with gfortran is quite straightforward for anyone familiar with other compilers in the GCC family. Because gfortran depends on many of the core components of GCC, gfortran shares most of the standard command-line options for GCC compilers. Listing 3-1 shows

In this second example, a search is performed by a minimum and maximum StandardCost range: -- Local variables used for searches DECLARE @ProductID int DECLARE @MinStandardCost money DECLARE @MaxStandardCost money SET @MinStandardCost = 3.3963 SET @MaxStandardCost = 10.0000 SELECT ProductID, StartDate, StandardCost FROM Production.ProductCostHistory WHERE ProductID = ISNULL(@ProductID, ProductID) AND StandardCost BETWEEN ISNULL(@MinStandardCost, StandardCost) AND ISNULL(@MaxStandardCost, StandardCost) ORDER BY StandardCost This returns the following (abridged) results: ProductID 709 710 712 846 ... 932 860 859 858 StartDate 2001-07-01 2001-07-01 2001-07-01 2002-07-01 2003-07-01 2002-07-01 2002-07-01 2002-07-01 StandardCost 3.3963 3.3963 5.7052 5.7709 9.3463 9.7136 9.7136 9.7136

To use the dither command-line option, you must specify either the monochrome command-line option or the colors command-line option.