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The name of the table that you are creating the full-text index on. There can only be one full-text index on a single table. The listed column or columns to be indexed, which can be of the data types varchar, nvarchar, char, nchar, xml, varbinary, text, ntext, and image. The TYPE COLUMN keyword token is used to designate a column in the table that tells the full-text index what type of data is held in the varbinary(max) or image data type column. SQL Server can interpret different file types, but must know exactly how to do so. In this case, the FileExtension table has .doc in it for each row. This tells SQL Server that the data held in Document will be of a Word Document format. The optional LANGUAGE keyword can also be used within the column list to indicate the language of the data stored in the column. Specifying the language will help SQL Server determine how the data is parsed in the full-text indexing process and how it will be linguistically interpreted. For a list of available languages, query the sys.fulltext_languages table. In order for the full-text index to be created on a table, that table must have a single-key, unique, non-nullable column. This can be, for example, a single column primary key, or a column defined with a UNIQUE constraint that is also nonnullable. The KEY INDEX clause in the CREATE FULLTEXT INDEX command identifies the required unique key column on the specified table. (Continued)

Table 6-2. (Continued)

If you are writing a header file that must work when included in ISO C programs, write __typeof__ instead of typeof.

You can see here that the edges of the circle are a lot rougher than they were in the original image, because the averaging process hasn t been very forgiving.

The ON clause designates the catalog where the full-text index will be stored. If a default catalog was identified before creation of the index, and this option isn't used, the index will be stored on the default catalog. However if no default was defined, the index creation will fail. This argument determines how user data changes will be detected by the full-text service. Based on this configuration, indexes can be automatically updated as data is changed in the table. You also have the option of only manually repopulating the indexes at a time or on a schedule of your choosing. The AUTO option is designated to automatically update the full-text index as table data is modified. The MANUAL option means that changes will either be propagated manually by the user or initiated via a SQL Server Agent schedule. The OFF option means that SQL Server will not keep a list of user changes. Using OFF with NO POPULATION means that SQL Server will not populate the index after it is created. Under this option, full-text index population will only occur after someone executes ALTER FULLTEXT INDEX, which is reviewed in the next recipe.

Semantically, typeof can be used anywhere a typedef name would be, which includes declarations, casts, sizeof statements, or even, if you want to be perverse, within another typeof statement. A typical use of typeof is to create type-safe expressions, such as a max macro that can safely operate on any arithmetic type and evaluate each of its arguments exactly once: #define max(a,b) \ ({ typeof (a) _a = (a); \ typeof (b) _b = (b); \ _a > _b _a : _b; }) The names _a and _b start with underscores to avoid the local variables conflicting with variables having the same name at the scope in which the macro is called. Additional typeof uses might include the following, or variations thereof: typeof (*x) y;: Declares y to be of the type to which x points. typeof (*x) y[4];: Declares y to be an array of the values to which x points. typeof (typeof (char *)[4]) y;: Declares y as an array of pointers to characters. Clearly, this code is more elaborate than the standard C declaration char *y[4];, to which it is equivalent.

CHANGE_TRACKING {MANUAL | AUTO | OFF [, NO POPULATION]}

Zero-length arrays are allowed in GNU C. They are very useful as the last element of a structure that is really a header for a variable-length object. Consider the following:

In this recipe s example, a new full-text index is created on the AdventureWorks database s Production.Document table (we ll demonstrate how to query the index in future recipes). DocumentSummary is the column to be indexed, and FileExtension is the column that contains a pointer to the column s document type: CREATE FULLTEXT INDEX ON Production.Document (DocumentSummary, Document TYPE COLUMN FileExtension) KEY INDEX PK_Document_DocumentID ON cat_Production_Document WITH CHANGE_TRACKING AUTO

struct data { int i; int j; } struct entry { int size; struct data[0]; }; int e_sz; struct entry *e = (struct entry *) malloc(sizeof (struct entry) + e_sz); e->size = e_sz; In ISO C89, you must define data[1], giving data a length of 1 This requirement forces you to waste space (a trivial concern in this example) or, more likely, complicate the malloc() call ISO C99 allows you to use flexible array members, which have slightly different characteristics: Flexible array members would be defined as contents[], not contents[0] C99 considers flexible array members to have incomplete type specifications You cannot use sizeof with incomplete types With GNU C s zero-length arrays, however, sizeof evaluates to 0 It is up to you to decide if that is a feature or not Most significantly, flexible array members may only appear as the last member of nonempty structs.